Storage Guide
Understanding, using, and managing persistent storage in OpenStack
Abstract
Making open source more inclusive
Red Hat is committed to replacing problematic language in our code, documentation, and web properties. We are beginning with these four terms: master, slave, blacklist, and whitelist. Because of the enormity of this endeavor, these changes will be implemented gradually over several upcoming releases. For more details, see our CTO Chris Wright’s message.
Chapter 1. Introduction to persistent storage in Red Hat OpenStack Platform (RHOSP)
Within Red Hat OpenStack Platform, storage is provided by three main services:
-
Block Storage (
openstack-cinder
) -
Object Storage (
openstack-swift
) -
Shared File System Storage (
openstack-manila
)
These services provide different types of persistent storage, each with its own set of advantages in different use cases. This guide discusses the suitability of each for general enterprise storage requirements.
You can manage cloud storage by using either the RHOSP dashboard or the command-line clients. You can perform most procedures by using either method. However, you can complete some of the more advanced procedures only on the command line. This guide provides procedures for the dashboard where possible.
For the complete suite of documentation for Red Hat OpenStack Platform, see Red Hat OpenStack Platform Documentation.
This guide documents the use of crudini
to apply some custom service settings. As such, you need to install the crudini
package first:
# dnf install crudini -y
RHOSP recognizes two types of storage: ephemeral and persistent. Ephemeral storage is storage that is associated only to a specific Compute instance. Once that instance is terminated, so is its ephemeral storage. This type of storage is useful for basic runtime requirements, such as storing the instance’s operating system.
Persistent storage, is designed to survive (persist) independent of any running instance. This storage is used for any data that needs to be reused, either by different instances or beyond the life of a specific instance. RHOSP uses the following types of persistent storage:
- Volumes
The OpenStack Block Storage service (openstack-cinder) allows users to access block storage devices through volumes. Users can attach volumes to instances in order to augment their ephemeral storage with general-purpose persistent storage. Volumes can be detached and re-attached to instances at will, and can only be accessed through the instance they are attached to.
You can also configure instances to not use ephemeral storage. Instead of using ephemeral storage, you can configure the Block Storage service to write images to a volume. You can then use the volume as a bootable root volume for an instance.
Volumes also provide inherent redundancy and disaster recovery through backups and snapshots. In addition, you can also encrypt volumes for added security.
- Containers
The OpenStack Object Storage service (openstack-swift) provides a fully-distributed storage solution used to store any kind of static data or binary object, such as media files, large datasets, and disk images. The Object Storage service organizes these objects by using containers.
Although the content of a volume can be accessed only through instances, the objects inside a container can be accessed through the Object Storage REST API. As such, the Object Storage service can be used as a repository by nearly every service within the cloud.
- Shares
- The Shared File Systems service (openstack-manila) provides the means to easily provision remote, shareable file systems, or shares. Shares allow projects within the cloud to openly share storage, and can be consumed by multiple instances simultaneously.
Each storage type is designed to address specific storage requirements. Containers are designed for wide access, and as such feature the highest throughput, access, and fault tolerance among all storage types. Container usage is geared more towards services.
On the other hand, volumes are used primarily for instance consumption. They do not enjoy the same level of access and performance as containers, but they do have a larger feature set and have more native security features than containers. Shares are similar to volumes in this regard, except that they can be consumed by multiple instances.
The following sections discuss each storage type’s architecture and feature set in detail, within the context of specific storage criteria.
1.1. Scalability and back-end storage
In general, a clustered storage solution provides greater back-end scalability. For example, when you use Red Hat Ceph as a Block Storage (cinder) back end, you can scale storage capacity and redundancy by adding more Ceph Object Storage Daemon (OSD) nodes. Block Storage, Object Storage (swift) and Shared File Systems Storage (manila) services support Red Hat Ceph Storage as a back end.
The Block Storage service can use multiple storage solutions as discrete back ends. At the back-end level, you can scale capacity by adding more back ends and restarting the service. The Block Storage service also features a large list of supported back-end solutions, some of which feature additional scalability features.
By default, the Object Storage service uses the file system on configured storage nodes, and it can use as much space as is available. The Object Storage service supports the XFS and ext4 file systems, and both can be scaled up to consume as much underlying block storage as is available. You can also scale capacity by adding more storage devices to the storage node.
The Shared File Systems service provisions file shares from designated storage pools that are managed by one or more third-party back-end storage systems. You can scale this shared storage by increasing the size or number of storage pools available to the service or by adding more third-party back-end storage systems to the deployment.
1.2. Storage accessibility and administration
Volumes are consumed only through instances, and can only be attached to and mounted within one instance at a time. Users can create snapshots of volumes, which they can be used for cloning or restoring a volume to a previous state. For more information, see Section 1.4, “Storage redundancy and disaster recovery”. As a project administrator, you can use the Block Storage service to create volume types, which aggregate volume settings, such as size and back end. You can associate volume types with Quality of Service (QoS) specifications to provide different levels of performance for your cloud users. Your users can specify the volume type they require when creating new volumes. For example, volumes that use higher performance QoS specifications could provide your users with more IOPS or your users could assign lighter workloads to volumes that use lower performance QoS specifications to conserve resources.
Like volumes, shares are consumed through instances. However, shares can be directly mounted within an instance, and do not need to be attached through the dashboard or CLI. Shares can also be mounted by multiple instances simultaneously. The Shared File Systems service also supports share snapshots and cloning; you can also create share types to aggregate settings (similar to volume types).
Objects in a container are accessible via API, and can be made accessible to instances and services within the cloud. This makes them ideal as object repositories for services; for example, the Image service (openstack-glance) can store its images in containers managed by the Object Storage service.
1.3. Storage security
The Block Storage service (cinder) provides basic data security through volume encryption. With this, you can configure a volume type to be encrypted through a static key; the key is then used to encrypt all volumes that are created from the configured volume type. For more information, see Section 2.7, “Block Storage service (cinder) volume encryption”.
Object and container security is configured at the service and node level. The Object Storage service (swift) provides no native encryption for containers and objects. Rather, the Object Storage service prioritizes accessibility within the cloud, and as such relies solely on the cloud network security to protect object data.
The Shared File Systems service (manila) can secure shares through access restriction, whether by instance IP, user or group, or TLS certificate. In addition, some Shared File Systems service deployments can feature separate share servers to manage the relationship between share networks and shares; some share servers support, or even require, additional network security. For example, a CIFS share server requires the deployment of an LDAP, Active Directory, or Kerberos authentication service.
For more information about how to secure the Image service (glance), such as image signing and verification and metadata definition (metadef) API restrictions, see The Image service (glance) in Creating and Managing Images.
1.4. Storage redundancy and disaster recovery
The Block Storage service (cinder) features volume backup and restoration, which provides basic disaster recovery for user storage. Use backups to protect volume contents. The service also supports snapshots. In addition to cloning, you can use snapshots to restore a volume to a previous state.
In a multi-back end environment, you can also migrate volumes between back ends. This is useful if you need to take a back end offline for maintenance. Backups are typically stored in a storage back end separate from their source volumes to help protect the data. This is not possible with snapshots because snapshots are dependent on their source volumes.
The Block Storage service also supports the creation of consistency groups to group volumes together for simultaneous snapshot creation. This provides a greater level of data consistency across multiple volumes. For more information, see Section 2.9, “Block Storage service (cinder) consistency groups”.
The Object Storage service (swift) provides no built-in backup features. You must perform all backups at the file system or node level. The Object Storage service features more robust redundancy and fault tolerance, even the most basic deployment of the Object Storage service replicates objects multiple times. You can use failover features like dm-multipath
to enhance redundancy.
The Shared File Systems service provides no built-in backup features for shares, but it does allow you to create snapshots for cloning and restoration.
Chapter 2. Configuring the Block Storage service (cinder)
The Block Storage service (cinder) manages the administration, security, scheduling, and overall management of all volumes. Volumes are used as the primary form of persistent storage for Compute instances.
For more information about volume backups, see the Block Storage Backup Guide.
You must install host bus adapters (HBAs) on all Controller nodes and Compute nodes in any deployment that uses the Block Storage service and a Fibre Channel (FC) back end.
Block Storage is configured using the Block Storage REST API.
Ensure that you are using Block Storage REST API version 3 because Block Storage no longer supports version 2. The default overcloud deployment does this for you by setting the environment variable OS_VOLUME_API_VERSION=3.0
.
The Block Storage REST API preserves backward compatibility by using microversions to add enhancements. The cinder
CLI uses the REST API version of 3.0, unless you specify a specific microversion. For instance, to specify the 3.17 microversion for a cinder
command, add the --os-volume-api-version 3.17
argument.
The openstack
CLI can only use the Block Storage REST API version of 3.0 because it does not support these microversions.
2.1. Block Storage service back ends
Red Hat OpenStack Platform (RHOSP) is deployed using director. Doing so helps ensure the correct configuration of each service, including the Block Storage service (cinder) and, by extension, its back end. Director also has several integrated back-end configurations.
RHOSP supports Red Hat Ceph Storage and NFS as Block Storage service back ends. By default, the Block Storage service uses an LVM back end as a repository for volumes. While this back end is suitable for test environments, LVM is not supported in production environments.
For instructions on how to deploy Red Hat Ceph Storage with RHOSP, see Deploying Red Hat Ceph Storage and OpenStack Platform together with director.
You can also configure the Block Storage service to use supported third-party storage appliances. Director includes the necessary components for deploying different back-end solutions.
For a complete list of supported Block Storage service back-end appliances and drivers, see Cinder in Component, Plug-In, and Driver Support in Red Hat OpenStack Platform. All third-party back-end appliances and drivers have additional deployment guides. Review the appropriate deployment guide to determine if a back-end appliance or driver requires a plugin.
If you configured Block Storage to use multiple back ends, you must create a volume type for each back end. If you do not specify a back end when creating the volume, the Block Storage scheduler uses filters to select suitable back ends. For more information, see Configuring the default Block Storage scheduler filters.
Additional resources
2.2. Active-active Block Storage for high availability
In active-passive mode, if the Block Storage service fails in a hyperconverged deployment, node fencing is undesirable. This is because node fencing can trigger storage to be rebalanced unnecessarily. Edge sites do not deploy Pacemaker, although Pacemaker is still present at the control site. Instead, edge sites deploy the Block Storage service in an active-active configuration to support highly available hyperconverged deployments.
Active-active deployments improve scaling, performance, and reduce response time by balancing workloads across all available nodes. Deploying the Block Storage service in an active-active configuration creates a highly available environment that maintains the management layer during partial network outages and single- or multi-node hardware failures. Active-active deployments allow a cluster to continue providing Block Storage services during a node outage.
Active-active deployments do not, however, enable workflows to resume automatically. If a service stops, individual operations running on the failed node will also fail during the outage. In this situation, confirm that the service is down and initiate a cleanup of resources that had in-flight operations.
2.2.1. Enabling active-active Block Storage
The cinder-volume-active-active.yaml
file enables you to deploy the Block Storage service in an active-active configuration. This file ensures director uses the non-Pacemaker cinder-volume heat template and adds the etcd
service to the deployment as a distributed lock manager (DLM).
The cinder-volume-active-active.yaml
file also defines the active-active cluster name by assigning a value to the CinderVolumeCluster
parameter. CinderVolumeCluster
is a global Block Storage parameter. Therefore, you cannot include clustered (active-active) and non-clustered back ends in the same deployment.
Currently, active-active configuration for Block Storage works only with Ceph RADOS Block Device (RBD) back ends. If you plan to use multiple back ends, all back ends must support the active-active configuration. If a back end that does not support the active-active configuration is included in the deployment, that back end will not be available for storage. In an active-active deployment, you risk data loss if you save data on a back end that does not support the active-active configuration.
Prerequisites
- The undercloud is installed. For more information, see Installing director in Director Installation and Usage.
Procedure
-
Log in to the undercloud host as the
stack
user. Source the
stackrc
undercloud credentials file:$ source ~/stackrc
To enable active-active Block Storage service volumes, add this environment file to the stack with your other environment files and deploy the overcloud:
/usr/share/openstack-tripleo-heat-templates/environments/cinder-volume-active-active.yaml
2.2.2. Maintenance commands for active-active Block Storage configurations
After deploying an active-active Block Storage configuration, you can use the following commands to manage the clusters and their services.
These commands need a Block Storage (cinder) REST API microversion of 3.17 or later.
User goal | Command |
To see detailed information about all the services, such as: binary, host, zone, status, state, cluster, disabled reason, and the cluster name. |
|
To see detailed information about all the clusters, such as: name, binary, state, and status.
NOTE: When deployed by director for the Ceph back end, the default cluster name is |
|
To see detailed information about a specific clustered service. |
|
To enable a clustered service. |
|
To disable a clustered service. |
|
2.2.3. Volume manage and unmanage
The unmanage and manage mechanisms facilitate moving volumes from one service using version X to another service using version X+1. Both services remain running during this process.
In Block Storage (cinder) REST API microversion 3.17 or later, you can list the volumes and snapshots that can be managed in Block Storage clusters. To see these lists, use the --cluster
argument with cinder manageable-list
or cinder snapshot-manageable-list
.
In Block Storage REST API microversion 3.16 and later, you can use the optional --cluster
argument of the cinder manage
command to add unmanaged volumes to a Block Storage cluster.
2.2.4. Volume migration on a clustered service
With Block Storage (cinder) REST API microversion 3.16 and later, the cinder migrate
and cinder-manage
commands use the --cluster
argument to define the destination for active-active deployments.
When you migrate a volume on a Block Storage clustered service, use the optional --cluster
argument and omit the host
positional argument, because these arguments are mutually exclusive.
2.2.5. Initiating Block Storage service maintenance
All Block Storage volume services perform their own maintenance when they start.
In an environment with multiple volume services grouped in a cluster, you can clean up services that are not currently running.
The command work-cleanup
triggers server cleanups. The command returns:
- A list of the services that the command can clean.
- A list of the services that the command cannot clean because they are not currently running in the cluster.
Prerequisites
- You must be a project administrator to initiate Block Storage service maintenance.
- Block Storage (cinder) REST API microversion 3.24 or later.
Procedure
Source the overcloud credentials file:
$ source ~/<credentials_file>
-
Replace
<credentials_file>
with the name of your credentials file, for example,overcloudrc
.
-
Replace
Run the following command to verify whether all of the services for a cluster are running:
$ cinder cluster-list --detailed
Alternatively, run the
cluster show
command.If any services are not running, run the following command to identify those specific services:
$ cinder service-list
Run the following command to trigger the server cleanup:
$ cinder --os-volume-api-version 3.24 work-cleanup [--cluster <cluster-name>] [--host <hostname>] [--binary <binary>] [--is-up <True|true|False|false>] [--disabled <True|true|False|false>] [--resource-id <resource-id>] [--resource-type <Volume|Snapshot>]
NoteFilters, such as
--cluster
,--host
, and--binary
, define what the command cleans. You can filter on cluster name, host name, type of service, and resource type, including a specific resource. If you do not apply filtering, the command attempts to clean everything that can be cleaned.The following example filters by cluster name:
$ cinder --os-volume-api-version 3.24 work-cleanup --cluster tripleo@tripleo_ceph
2.3. Group volume configuration with volume types
With Red Hat OpenStack Platform you can create volume types so that you can apply associated settings to each volume type. You can assign the required volume type before and after you create a volume. For more information, see Creating Block Storage volumes and Block Storage volume retyping. The following list shows some of the associated settings that you can apply to a volume type:
- The encryption of a volume. For more information, see Block Storage service (cinder) volume encryption.
- The back end that a volume uses. For more information, see Volume allocation on multiple back ends and Moving volumes between back ends.
- The associated list of Quality of Service (QoS) performance limits or QoS specification for a volume. For more information, see Block Storage service (cinder) Quality of Service specifications.
Settings are associated with volume types using key-value pairs called Extra Specs. When you specify a volume type during volume creation, the Block Storage scheduler applies these key-value pairs as settings. You can associate multiple key-value pairs to the same volume type.
You can create volume types to provide different levels of performance for your cloud users:
- Add specific performance, resilience, and other Extra Specs as key-value pairs to each volume type.
- Associate different lists of QoS performance limits or QoS specifications to your volume types.
When your users create their volumes, they can select the appropriate volume type that fulfills their performance requirements.
If you create a volume and do not specify a volume type, then Block Storage uses the default volume type. You can use the Block Storage (cinder) configuration file to define the general default volume type that applies to all your projects (tenants). But if your deployment uses project-specific volume types, ensure that you define default volume types for each project. In this case, Block Storage uses the project-specific volume type instead of the general default volume type. For more information, see Defining a project-specific default volume type.
Additional resources
2.3.1. Listing back-end driver properties
The properties associated with volume types use key-value pairs called Extra Specs. Each volume type back-end driver supports their own set of Extra Specs. For more information on which Extra Specs a driver supports, see the back-end driver documentation.
Alternatively, you can query the Block Storage host directly to list the well-defined standard Extra Specs of its back-end driver.
Prerequisites
- You must be a project administrator to query the Block Storage host directly.
Procedure
Source the overcloud credentials file:
$ source ~/<credentials_file>
-
Replace
<credentials_file>
with the name of your credentials file, for example,overcloudrc
.
-
Replace
Determine the host of cinder-volume:
$ cinder service-list
This command will return a list containing the host of each Block Storage service (cinder-backup, cinder-scheduler, and cinder-volume). For example:
+------------------+---------------------------+------+--------- | Binary | Host | Zone | Status ... +------------------+---------------------------+------+--------- | cinder-backup | localhost.localdomain | nova | enabled ... | cinder-scheduler | localhost.localdomain | nova | enabled ... | cinder-volume | *localhost.localdomain@lvm* | nova | enabled ... +------------------+---------------------------+------+---------
Display the driver capabilities to determine the supported Extra Specs of a Block Storage service:
$ cinder get-capabilities <volsvchost>
Replace
<volsvchost>
with the host of cinder-volume. For example:$ cinder get-capabilities localhost.localdomain@lvm +---------------------+-----------------------------------------+ | Volume stats | Value | +---------------------+-----------------------------------------+ | description | None | | display_name | None | | driver_version | 3.0.0 | | namespace | OS::Storage::Capabilities::localhost.loc... | pool_name | None | | storage_protocol | iSCSI | | vendor_name | Open Source | | visibility | None | | volume_backend_name | lvm | +---------------------+-----------------------------------------+ +--------------------+------------------------------------------+ | Backend properties | Value | +--------------------+------------------------------------------+ | compression | {u'type': u'boolean', u'description'... | qos | {u'type': u'boolean', u'des ... | replication | {u'type': u'boolean', u'description'... | thin_provisioning | {u'type': u'boolean', u'description': u'S... +--------------------+------------------------------------------+
The Backend properties column shows a list of Extra Spec Keys that you can set, while the Value column provides information on valid corresponding values.
2.3.2. Creating and configuring a volume type
You can create volume types so that you can apply associated settings to each volume type. For instance, you can create volume types to provide different levels of performance for your cloud users:
- Add specific performance, resilience, and other Extra Specs as key-value pairs to each volume type.
- Associate different lists of QoS performance limits or QoS specifications to your volume types. For more information, see Block Storage service (cinder) Quality of Service specifications.
When your users create their volumes, they can select the appropriate volume type that fulfills their performance requirements.
Prerequisites
- You must be a project administrator to create and configure volume types.
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard as an admin user.
- Select Admin > Volumes > Volume Types.
- Click Create Volume Type.
- Enter the volume type name in the Name field.
- Click Create Volume Type. The new type appears in the Volume Types table.
- Select the volume type’s View Extra Specs action.
- Click Create and specify the Key and Value. The key-value pair must be valid; otherwise, specifying the volume type during volume creation will result in an error.
- Click Create. The associated setting (key-value pair) now appears in the Extra Specs table.
By default, all volume types are accessible to all OpenStack projects. If you need to create volume types with restricted access, you will need to do so through the CLI. For instructions, see Creating and configuring private volume types.
2.3.3. Editing a volume type
Edit a volume type in the dashboard to modify the Extra Specs configuration of the volume type. You can also delete a volume type.
Prerequisites
- You must be a project administrator to edit or delete volume types.
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard as an admin user.
- Select Admin > Volumes > Volume Types.
- In the Volume Types table, select the volume type’s View Extra Specs action.
On the Extra Specs table of this page, you can:
- Add a new setting to the volume type. To do this, click Create and specify the key/value pair of the new setting you want to associate to the volume type.
- Edit an existing setting associated with the volume type by selecting the setting’s Edit action.
- Delete existing settings associated with the volume type by selecting the extra specs' check box and clicking Delete Extra Specs in this and the next dialog screen.
To delete a volume type, select its corresponding check boxes from the Volume Types table and click Delete Volume Types.
2.3.4. Creating and configuring private volume types
By default, all volume types are available to all projects (tenants). You can create a restricted volume type by marking it private. To do so, set the is-public
flag of the volume type to false, because the default value for this flag is true.
Private volume types are useful for restricting access to volumes with certain attributes. Typically, these are settings that should only be usable by specific projects. For instance, new back ends or ultra-high performance configurations that are being tested.
Prerequisites
- You must be a project administrator to create, view, or configure access for private volume types.
Procedure
Source the overcloud credentials file:
$ source ~/<credentials_file>
-
Replace
<credentials_file>
with the name of your credentials file, for example,overcloudrc
.
-
Replace
Create a new cinder volume type and set the
is-public
flag to false:$ cinder type-create --is-public false <type_name>
-
Replace
<type_name>
with the name that you want to call this new private volume type.
-
Replace
By default, private volume types are only accessible to their creators. However, admin users can find and view private volume types, by using the following command:
$ cinder type-list
This command lists the name and ID of both public and private volume types. You need the ID of the volume type to provide access to it.
Access to a private volume type is granted at the project level. You therefore need to know the ID of the required project. If you do not know this tenant ID but you do know a name of a user of this project, then run:
If you are unsure of this user name, the openstack user list
command lists the name and ID of all the configured users.
$ openstack user show <user_name>
-
Replace
<user_name>
with the name of a user of the required project to display a list of the user details, including thetenantId
of the project to which this user is associated.
To grant a project access to a private volume type, run:
$ cinder type-access-add --volume-type <type_id> --project-id <tenant_id>
-
Replace
<type_id>
with the ID of the required private volume type. -
Replace
<tenant_id>
with the required tenant ID.
To view which projects have access to a private volume type, run:
$ cinder type-access-list --volume-type <type_id>
To remove a project from the access list of a private volume type, run:
$ cinder type-access-remove --volume-type <type_id> --project-id <tenant_id>
2.3.5. Defining a project-specific default volume type
Optional: For complex deployments, project administrators can define a default volume type for each project (tenant).
If you create a volume and do not specify a volume type, then Block Storage uses the default volume type.
You can use the default_volume_type
option of the Block Storage (cinder) configuration file cinder.conf
to define the general default volume type that applies to all your projects.
But if your Red Hat OpenStack Platform (RHOSP) deployment uses project-specific volume types, ensure that you define default volume types for each project. In this case, Block Storage uses the project-specific volume type instead of the general default volume type. The following RHOSP deployment examples need project-specific default volume types:
- A distributed RHOSP deployment spanning many availability zones (AZs). Each AZ is in its own project and has its own volume types.
- A RHOSP deployment for three different departments of a company. Each department is in its own project and has its own specialized volume type.
Prerequisites
- At least one volume type in each project that will be the project-specific default volume type. For more information, see Creating and configuring a volume type.
- Block Storage REST API microversion 3.62 or later.
- Only project administrators can define, clear, or list default volume types for their projects.
Procedure
Source the overcloud credentials file:
$ source ~/<credentials_file>
-
Replace
<credentials_file>
with the name of your credentials file, for example,overcloudrc
.
-
Replace
Define, clear, or list the default volume type for a project:
NoteYou must replace
<project_id>
in these commands, with the ID of the required project. To find the ID and name of each tenant, run theopenstack project list
command.To define the default volume type for a project:
$ cinder --os-volume-api-version 3.62 default-type-set <volume_type> <project_id>
-
Replace
<volume_type>
with the name or ID of the required volume type. You can run thecinder type-list
command to list the name and ID of all the volume types.
-
Replace
To clear the default volume type for a project:
$ cinder --os-volume-api-version 3.62 default-type-unset <project_id>
To list the default volume type for a project:
$ cinder --os-volume-api-version 3.62 default-type-list --project <project_id>
2.4. Creating and configuring an internal project for the Block Storage service (cinder)
Some Block Storage features (for example, the Image-Volume cache) require the configuration of an internal tenant. The Block Storage service uses this tenant/project to manage block storage items that do not necessarily need to be exposed to normal users. Examples of such items are images cached for frequent volume cloning or temporary copies of volumes being migrated.
Procedure
- To configure an internal project, first create a generic project and user, both named cinder-internal. To do so, log in to the Controller node and run:
$ openstack project create --enable --description "Block Storage Internal Project" cinder-internal +-------------+----------------------------------+ | Property | Value | +-------------+----------------------------------+ | description | Block Storage Internal Tenant | | enabled | True | | id | cb91e1fe446a45628bb2b139d7dccaef | | name | cinder-internal | +-------------+----------------------------------+ $ openstack user create --project cinder-internal cinder-internal +----------+----------------------------------+ | Property | Value | +----------+----------------------------------+ | email | None | | enabled | True | | id | 84e9672c64f041d6bfa7a930f558d946 | | name | cinder-internal | |project_id| cb91e1fe446a45628bb2b139d7dccaef | | username | cinder-internal | +----------+----------------------------------+
2.5. Configuring the image-volume cache
The Block Storage service features an optional Image-Volume cache which can be used when creating volumes from images. This cache is designed to improve the speed of volume creation from frequently-used images. For information on how to create volumes from images, see Creating Block Storage volumes.
When enabled, the Image-Volume cache stores a copy of an image the first time a volume is created from it. This stored image is cached locally to the Block Storage back end to help improve performance the next time the image is used to create a volume. The limit of the Image-Volume cache can be set to a size (in GB), number of images, or both.
The Image-Volume cache is supported by several back ends. If you are using a third-party back end, refer to its documentation for information on Image-Volume cache support.
Prerequisites
- An internal tenant has been configured for the Block Storage service. For more information, see Creating and configuring an internal project for the Block Storage service (cinder).
- The undercloud is installed. For more information, see Installing director in Director Installation and Usage.
Procedure
-
Log in to the undercloud host as the
stack
user. Source the
stackrc
undercloud credentials file:$ source ~/stackrc
To enable and configure the Image-Volume cache on a back end, you must add the following values to an
ExtraConfig
section of an environment file included in your overcloud deployment command:parameter_defaults: ExtraConfig: cinder::config::cinder_config: DEFAULT/cinder_internal_tenant_project_id: value: TENANTID 1 DEFAULT/cinder_internal_tenant_user_id: value: USERID 2 BACKEND/image_volume_cache_enabled: 3 value: True BACKEND/image_volume_cache_max_size_gb: value: MAXSIZE 4 BACKEND/image_volume_cache_max_count: value: MAXNUMBER 5
- 1
- Replace TENANTID with the ID of the cinder-internal project.
- 2
- Replace USERID with the ID of the cinder-internal user.
- 3
- Replace BACKEND with the name of the target back end (specifically, its volume_backend_name value).
- 4
- By default, the Image-Volume cache size is only limited by the back end. Set MAXSIZE to the required size in GB.
- 5
- Set MAXNUMBER to the maximum number of images.
The Block Storage service database uses a time stamp to track when each cached image was last used to create an image. If either or both MAXSIZE and MAXNUMBER are set, the Block Storage service will delete cached images as needed to make way for new ones. Cached images with the oldest time stamp are deleted first whenever the Image-Volume cache limits are met.
- Save the updates to your environment file.
- Add your environment file to the stack with your other environment files and deploy the overcloud.
2.6. Block Storage service (cinder) Quality of Service specifications
You can apply performance limits to volumes that your cloud users create, by creating and associating Quality of Service (QoS) specifications to each volume type. For example, volumes that use higher performance QoS specifications could provide your users with more IOPS or users could assign lighter workloads to volumes that use lower performance QoS specifications to conserve resources.
You must be a project administrator to create, configure, associate, and disassociate QoS specifications.
When you create a QoS specification you must choose the required consumer. The consumer determines where you want to apply the QoS limits and determines which QoS property keys are available to define the QoS limits. For more information about the available consumers, see Consumers of QoS specifications.
You can create volume performance limits by setting the required QoS property keys to your deployment specific values. For more information on the QoS property keys provided by the Block Storage service (cinder), see Block Storage QoS property keys.
To create a QoS specification and associate it with a volume type, complete the following tasks:
- Create and configure the QoS specification.
- Associate the QoS specification with a volume type.
You can create, configure, and associate a QoS specification to a volume type by using the Dashboard, or by using the CLI.
2.6.1. Consumers of QoS specifications
When you create a QoS specification you must choose the required consumer. The consumer determines where you want to apply the QoS limits and determines which QoS property keys are available to define the QoS limits. The Block Storage service (cinder) supports the following consumers of QoS specifications:
-
front-end
: The Compute service (nova) applies the QoS limits when the volume is attached to an instance. The Compute service supports all the QoS property keys provided by the Block Storage service. back-end
: The back-end driver of the associated volume type applies the QoS limits. Each back-end driver supports their own set of QoS property keys. For more information on which QoS property keys the driver supports, see the back-end driver documentation.You would use the
back-end
consumer in cases where thefront-end
consumer is not supported. For instance, when attaching volumes to bare metal nodes through the Bare Metal Provisioning service (ironic).both
: Both consumers apply the QoS limits, where possible. This consumer type therefore supports the following QoS property keys:- When a volume is attached to an instance, then you can use every QoS property key that both the Compute service and the back-end driver supports.
- When the volume is not attached to an instance, then you can only use the QoS property keys that the back-end driver supports.
2.6.2. Block Storage QoS property keys
The Block Storage service provides you with QoS property keys so that you can limit the performance of the volumes that your cloud users create. These limits use the following two industry standard measurements of storage volume performance:
- Input/output operations per second (IOPS)
- Data transfer rate, measured in bytes per second
The consumer of the QoS specification determines which QoS property keys are supported. For more information, see Consumers of QoS specifications.
Block Storage cannot perform error checking of QoS property keys, because some QoS property keys are defined externally by back-end drivers. Therefore, Block Storage ignores any invalid or unsupported QoS property key.
Ensure that you spell the QoS property keys correctly. The volume performance limits that contain incorrectly spelled property keys are ignored.
For both the IOPS and data transfer rate measurements, you can configure the following performance limits:
- Fixed limits
- Typically, fixed limits should define the average usage of the volume performance measurement.
- Burst limits
Typically, burst limits should define periods of intense activity of the volume performance measurement. A burst limit makes allowance for an increased rate of activity for a specific time, while keeping the fixed limits low for average usage.
NoteThe burst limits all use a burst length of 1 second.
- Total limits
Specify a global limit for both the read and write operations of the required performance limit, by using the
total_*
QoS property key.NoteInstead of using a total limit you can apply separate limits to the read and write operations or choose to limit only the read or write operations.
- Read limits
Specify a limit that only applies to the read operations of the required performance limit, by using the
read_*
QoS property key.NoteThis limit is ignored when you specify a total limit.
- Write limits
Specify a limit that only applies to the write operations of the required performance limit, by using the
write_*
QoS property key.NoteThis limit is ignored when you specify a total limit.
You can use the following Block Storage QoS property keys to create volume performance limits for your deployment:
The default value for all QoS property keys is 0
, which means that the limit is unrestricted.
Performance limit | Measurement unit | QoS property keys |
---|---|---|
Fixed IOPS | IOPS |
|
Fixed IOPS calculated by the size of the volume. For more information about the usage restrictions of these limits, see QoS limits that scale according to volume size. | IOPS per GB |
|
Burst IOPS | IOPS |
|
Fixed data transfer rate | Bytes per second |
|
Burst data transfer rate | Bytes per second |
|
Size of an IO request when calculating IOPS limits. For more information, see Set the IO request size for IOPS limits. | Bytes |
|
2.6.2.1. Set the IO request size for IOPS limits
If you implement IOPS volume performance limits, you should also specify the typical IO request size to prevent users from circumventing these limits. If you do not then users could submit several large IO requests instead of a lot of smaller ones.
Use the size_iops_sec
QoS property key to specify the maximum size, in bytes, of a typical IO request. The Block Storage service uses this size to calculate the proportional number of typical IO requests for each IO request that is submitted, for example:
size_iops_sec=4096
- An 8 KB request is counted as two requests.
- A 6 KB request is counted as one and a half requests.
- Any request less than 4 KB is counted as one request.
The Block Storage service only uses this IO request size limit when calculating IOPS limits.
The default value of size_iops_sec
is 0
, which ignores the size of IO requests when applying IOPS limits.
2.6.2.2. IOPS limits that scale according to volume size
You can create IOPS volume performance limits that are determined by the capacity of the volumes that your users create. These Quality of Service (QoS) limits scale with the size of the provisioned volumes. For example, if the volume type has an IOPS limit of 500 per GB of volume size for read operations, then a provisioned 3 GB volume of this volume type would have a read IOPS limit of 1500.
The size of the volume is determined when the volume is attached to an instance. Therefore if the size of the volume is changed while it is attached to an instance, these limits are only recalculated for the new volume size when this volume is detached and then reattached to an instance.
You can use the following QoS property keys, specified in IOPS per GB, to create scalable volume performance limits:
total_iops_sec_per_gb
: Specify a global IOPS limit per GB of volume size for both the read and write operations.NoteInstead of using a total limit you can apply separate limits to the read and write operations or choose to limit only the read or write operations.
read_iops_sec_per_gb
: Specify a IOPS limit per GB of volume size that only applies to the read operations.NoteThis limit is ignored when you specify a total limit.
write_iops_sec_per_gb
: Specify a IOPS limit per GB of volume size that only applies to the write operations.NoteThis limit is ignored when you specify a total limit.
The consumer of the QoS specification containing these QoS limits can either be front-end
or both
, but not back-end
. For more information, see Consumers of QoS specifications.
2.6.3. Creating and configuring a QoS specification with the Dashboard
A Quality of Service (QoS) specification is a list of volume performance QoS limits. You create each QoS limit by setting a QoS property key to your deployment specific value. To apply the QoS performance limits to a volume, you must associate the QoS specification with the required volume type.
Prerequisites
- You must be a project administrator to create, configure, associate, and disassociate QoS specifications.
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard as an admin user.
- Select Admin > Volumes > Volume Types.
- On the QoS Specs table, click Create QoS Spec.
- Enter a name for the QoS Spec.
- In the Consumer field, choose the consumer of this QoS specification. For more information, see Consumers of QoS specifications.
- Click Create. The new QoS specification is displayed in the QoS Specs table.
- In the QoS Specs table, select the Manage Specs action of your new QoS specification to open the Specs window, where you add the QoS performance limits.
- Click Create in the Specs window to open the Create Extra Specs window.
Specify the QoS property key for a QoS performance limit in the Key field, and set the performance limit value in the Value field. For more information on the available property keys, see Block Storage QoS property keys.
ImportantEnsure that you spell the QoS property keys correctly. The volume performance limits that contain incorrectly spelled property keys are ignored.
- Click Create to add the QoS limit to your QoS specification.
- Repeat steps 7 to 10 for each QoS limit that you want to add to your QoS specification.
2.6.4. Creating and configuring a QoS specification with the CLI
A Quality of Service (QoS) specification is a list of volume performance QoS limits. You create each QoS limit by setting a QoS property key to your deployment specific value. To apply the QoS performance limits to a volume, you must associate the QoS specification with the required volume type.
Prerequisites
- You must be a project administrator to create, configure, associate, and disassociate QoS specifications.
Procedure
Source the overcloud credentials file:
$ source ~/<credentials_file>
-
Replace
<credentials_file>
with the name of your credentials file, for example,overcloudrc
.
-
Replace
Create the QoS specification:
$ openstack volume qos create [--consumer <qos_spec_consumer>] <qos_spec_name>
-
Optional: Replace
<qos_spec_consumer>
with the required consumer of this QoS specification. If not specified, the consumer defaults toboth
. For more information, see Consumers of QoS specifications. -
Replace
<qos_spec_name>
with the name of your QoS specification.
-
Optional: Replace
Add the performance limits to the QoS specification, by specifying a separate
--property <key=value>
argument for each QoS limit that you want to add:$ openstack volume qos set --property <key>=<value> <qos_spec_name>
Replace
<key>
with the QoS property key of the required performance constraint. For more information, see Block Storage QoS property keys.ImportantEnsure that you spell the QoS property keys correctly. The volume performance limits that contain incorrectly spelled property keys are ignored.
-
Replace
<value>
with your deployment-specific limit for this performance constraint, in the measurement unit required by the QoS property key. Replace
<qos_spec_name>
with the name or ID of your QoS specification.Example:
$ openstack volume qos set \ --property read_iops_sec=5000 \ --property write_iops_sec=7000 \ myqoslimits
Review the QoS specification:
$ openstack volume qos list +--------------------------------------+---------+-----------+--------------+-----------------------------------------------------+ | ID | Name | Consumer | Associations | Properties | +--------------------------------------+---------+-----------+--------------+-----------------------------------------------------+ | 204c6ba2-c67c-4ac8-918a-03f101811235 | myqoslimits | front-end | | read_iops_sec='5000', write_iops_sec='7000' | +--------------------------------------+---------+-----------+--------------+-----------------------------------------------------+
This command provides a table of the configuration details of all the configured QoS specifications.
2.6.5. Associating a QoS specification with a volume type by using the Dashboard
You must associate a Quality of Service (QoS) specification with an existing volume type to apply the QoS limits to volumes.
If a volume is already attached to an instance, then the QoS limits are only applied to this volume when the volume is detached and then reattached to this instance.
Prerequisites
- You must be a project administrator to create, configure, associate, and disassociate QoS specifications.
- The required volume type is created. For more information, see Creating and configuring a volume type.
- The required QoS specification is created. For more information, see Creating and configuring a QoS specification with the Dashboard.
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard as an admin user.
- Select Admin > Volumes > Volume Types.
- In the Volume Types table, select the Manage QoS Spec Association action of the required volume type.
- Select the required QoS specification from the QoS Spec to be associated list.
- Click Associate. The QoS specification is added to the Associated QoS Spec column of the edited volume type.
2.6.6. Associating a QoS specification with a volume type by using the CLI
You must associate a Quality of Service (QoS) specification with an existing volume type to apply the QoS limits to volumes.
If a volume is already attached to an instance, then the QoS limits are only applied to this volume when the volume is detached and then reattached to this instance.
Prerequisites
- You must be a project administrator to create, configure, associate, and disassociate QoS specifications.
- The required volume type is created. For more information, see Creating and configuring a volume type.
- The required QoS specification is created. For more information, see Creating and configuring a QoS specification with the CLI.
Procedure
Source the overcloud credentials file:
$ source ~/<credentials_file>
-
Replace
<credentials_file>
with the name of your credentials file, for example,overcloudrc
.
-
Replace
Associate the required QoS specification with the required volume type:
$ openstack volume qos associate <qos_spec_name> <volume_type>
-
Replace
<qos_spec_name>
with the name or ID of the QoS specification. You can run theopenstack volume qos list
command to list the name and ID of all the QoS specifications. -
Replace
<volume_type>
with the name or ID of the volume type. You can run thecinder type-list
command to list the name and ID of all the volume types.
-
Replace
Verify that the QoS specification has been associated:
$ openstack volume qos list
The Associations column of the output table shows which volume types are associated with this QoS specification.
2.6.7. Disassociating a QoS specification from a volume type with the Dashboard
You can disassociate a Quality of Service (QoS) specification from a volume type when you no longer want the QoS limits to be applied to volumes of that volume type.
If a volume is already attached to an instance, then the QoS limits are only removed from this volume when the volume is detached and then reattached to this instance.
Prerequisites
- You must be a project administrator to create, configure, associate, and disassociate QoS specifications.
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard as an admin user.
- Select Admin > Volumes > Volume Types.
- In the Volume Types table, select the Manage QoS Spec Association action of the required volume type.
- Select None from the QoS Spec to be associated list.
Click Associate.
The QoS specification should be removed from the Associated QoS Spec column of the edited volume type.
2.6.8. Disassociating a QoS specification from volume types with the CLI
You can disassociate a Quality of Service (QoS) specification from a volume type when you no longer want the QoS limits to be applied to volumes of that volume type.
If a volume is already attached to an instance, then the QoS limits are only removed from this volume when the volume is detached and then reattached to this instance.
Prerequisites
- You must be a project administrator to create, configure, associate, and disassociate QoS specifications.
Procedure
Source the overcloud credentials file:
$ source ~/<credentials_file>
-
Replace
<credentials_file>
with the name of your credentials file, for example,overcloudrc
.
-
Replace
Disassociate the volume types associated with the QoS specification. You can either disassociate a specific volume type, or all volumes types when more than one volume type is associated to the same QoS specification:
To disassociate a specific volume type associated with the QoS specification:
$ openstack volume qos disassociate <qos_spec_name> --volume-type <volume_type>
-
Replace
<qos_spec_name>
with the name or ID of the QoS specification. You can run theopenstack volume qos list
command to list the name and ID of all the QoS specifications. -
Replace
<volume_type>
with the name or ID of the volume type associated with this QoS specification. You can run thecinder type-list
command to list the name and ID of all the volume types.
-
Replace
To disassociate all volume types associated with the QoS specification:
$ openstack volume qos disassociate <qos_spec_name> --all
Verify that the QoS specification has been disassociated:
$ openstack volume qos list
The Associations column of this QoS specification should either not specify the volume type or be empty.
2.7. Block Storage service (cinder) volume encryption
Volume encryption helps provide basic data protection in case the volume back-end is either compromised or outright stolen. Both Compute and Block Storage services are integrated to allow instances to read access and use encrypted volumes. You must deploy Barbican to take advantage of volume encryption.
- Volume encryption is not supported on file-based volumes (such as NFS).
- Retyping an unencrypted volume to an encrypted volume of the same size is not supported, because encrypted volumes require additional space to store encryption data. For more information about encrypting unencrypted volumes, see Encrypting unencrypted volumes.
Volume encryption is applied through volume type. For information on encrypted volume types, see Configuring Block Storage service volume encryption with the Dashboard or Configuring Block Storage service volume encryption with the CLI.
For more information, on using the OpenStack Key Manager (barbican) to manage your Block Storage (cinder) encryption keys, see Encrypting Block Storage (cinder) volumes.
2.7.1. Configuring Block Storage service volume encryption with the Dashboard
To create encrypted volumes, you first need an encrypted volume type. Encrypting a volume type involves setting what provider class, cipher, and key size it should use. You can also re-configure the encryption settings of an encrypted volume type.
You can invoke encrypted volume types to automatically create encrypted volumes.
Prerequisites
- You must be a project administrator to create encrypted volumes.
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard as an admin user.
- Select Admin > Volumes > Volume Types.
- In the Actions column of the volume to be encrypted, select Create Encryption to launch the Create Volume Type Encryption wizard.
From there, configure the Provider, Control Location, Cipher, and Key Size settings of the volume type’s encryption. The Description column describes each setting.
ImportantThe values listed below are the only supported options for Provider, Cipher, and Key Size.
-
Enter
luks
for Provider. -
Enter
aes-xts-plain64
for Cipher. -
Enter
256
for Key Size.
-
Enter
- Click Create Volume Type Encryption.
You can also re-configure the encryption settings of an encrypted volume type.
- Select Update Encryption from the Actions column of the volume type to launch the Update Volume Type Encryption wizard.
- In Project > Compute > Volumes, check the Encrypted column in the Volumes table to determine whether the volume is encrypted.
- If the volume is encrypted, click Yes in that column to view the encryption settings.
Additional resources
2.7.2. Configuring Block Storage service volume encryption with the CLI
To create encrypted volumes, you first need an encrypted volume type. Encrypting a volume type involves setting what provider class, cipher, and key size it should use.
Prerequisites
- You must be a project administrator to create encrypted volumes.
Procedure
Source the overcloud credentials file:
$ source ~/<credentials_file>
-
Replace
<credentials_file>
with the name of your credentials file, for example,overcloudrc
.
-
Replace
Create a volume type:
$ cinder type-create myEncType
Configure the cipher, key size, control location, and provider settings:
$ cinder encryption-type-create --cipher aes-xts-plain64 --key-size 256 --control-location front-end myEncType luks
Create an encrypted volume:
$ cinder --debug create 1 --volume-type myEncType --name myEncVol
2.7.3. Automatic deletion of volume image encryption key
The Block Storage service (cinder) creates an encryption key in the Key Management service (barbican) when it uploads an encrypted volume to the Image service (glance). This creates a 1:1 relationship between an encryption key and a stored image.
Encryption key deletion prevents unlimited resource consumption of the Key Management service. The Block Storage, Key Management, and Image services automatically manage the key for an encrypted volume, including the deletion of the key.
The Block Storage service automatically adds two properties to a volume image:
-
cinder_encryption_key_id
- The identifier of the encryption key that the Key Management service stores for a specific image. -
cinder_encryption_key_deletion_policy
- The policy that tells the Image service to tell the Key Management service whether to delete the key associated with this image.
The values of these properties are automatically assigned. To avoid unintentional data loss, do not adjust these values.
When you create a volume image, the Block Storage service sets the cinder_encryption_key_deletion_policy
property to on_image_deletion
. When you delete a volume image, the Image service deletes the corresponding encryption key if the cinder_encryption_key_deletion_policy
equals on_image_deletion
.
Red Hat does not recommend manual manipulation of the cinder_encryption_key_id
or cinder_encryption_key_deletion_policy
properties. If you use the encryption key that is identified by the value of cinder_encryption_key_id
for any other purpose, you risk data loss.
2.8. Deploying availability zones for Block Storage volume back ends
An availability zone is a provider-specific method of grouping cloud instances and services. Director uses CinderXXXAvailabilityZone
parameters (where XXX
is associated with a specific back end) to configure different availability zones for Block Storage volume back ends.
Prerequisites
- The undercloud is installed. For more information, see Installing director in Director Installation and Usage.
Procedure
-
Log in to the undercloud host as the
stack
user. Source the
stackrc
undercloud credentials file:$ source ~/stackrc
Add the following parameters to the environment file to create two availability zones:
parameter_defaults: CinderXXXAvailabilityZone: zone1 CinderYYYAvailabilityZone: zone2
Replace XXX and YYY with supported back-end values, such as:
CinderISCSIAvailabilityZone CinderNfsAvailabilityZone CinderRbdAvailabilityZone
NoteSearch the
/usr/share/openstack-tripleo-heat-templates/deployment/cinder/
directory for the heat template associated with your back end for the correct back end value.The following example deploys two back ends where
rbd
is zone 1 andiSCSI
is zone 2:parameter_defaults: CinderRbdAvailabilityZone: zone1 CinderISCSIAvailabilityZone: zone2
- Save the updates to your environment file.
- Add your environment file to the stack with your other environment files and deploy the overcloud.
2.9. Block Storage service (cinder) consistency groups
You can use the Block Storage (cinder) service to set consistency groups to group multiple volumes together as a single entity. This means that you can perform operations on multiple volumes at the same time instead of individually. You can use consistency groups to create snapshots for multiple volumes simultaneously. This also means that you can restore or clone those volumes simultaneously.
A volume can be a member of multiple consistency groups. However, you cannot delete, retype, or migrate volumes after you add them to a consistency group.
2.9.1. Configuring Block Storage service consistency groups
By default, Block Storage security policy disables consistency groups APIs. You must enable it here before you use the feature. The related consistency group entries in the /etc/cinder/policy.json
file of the node that hosts the Block Storage API service, openstack-cinder-api
list the default settings:
"consistencygroup:create" : "group:nobody", "consistencygroup:delete": "group:nobody", "consistencygroup:update": "group:nobody", "consistencygroup:get": "group:nobody", "consistencygroup:get_all": "group:nobody", "consistencygroup:create_cgsnapshot" : "group:nobody", "consistencygroup:delete_cgsnapshot": "group:nobody", "consistencygroup:get_cgsnapshot": "group:nobody", "consistencygroup:get_all_cgsnapshots": "group:nobody",
You must change these settings in an environment file and then deploy them to the overcloud by using the openstack overcloud deploy
command. Do not edit the JSON file directly because the changes are overwritten next time the overcloud is deployed.
Prerequisites
- The undercloud is installed. For more information, see Installing director in Director Installation and Usage.
Procedure
-
Log in to the undercloud host as the
stack
user. Source the
stackrc
undercloud credentials file:$ source ~/stackrc
-
Edit an environment file and add a new entry to the
parameter_defaults
section. This ensures that the entries are updated in the containers and are retained whenever the environment is re-deployed by director with theopenstack overcloud deploy
command. Add a new section to an environment file using
CinderApiPolicies
to set the consistency group settings. The equivalentparameter_defaults
section with the default settings from the JSON file appear in the following way:parameter_defaults: CinderApiPolicies: { \ cinder-consistencygroup_create: { key: 'consistencygroup:create', value: 'group:nobody' }, \ cinder-consistencygroup_delete: { key: 'consistencygroup:delete', value: 'group:nobody' }, \ cinder-consistencygroup_update: { key: 'consistencygroup:update', value: 'group:nobody' }, \ cinder-consistencygroup_get: { key: 'consistencygroup:get', value: 'group:nobody' }, \ cinder-consistencygroup_get_all: { key: 'consistencygroup:get_all', value: 'group:nobody' }, \ cinder-consistencygroup_create_cgsnapshot: { key: 'consistencygroup:create_cgsnapshot', value: 'group:nobody' }, \ cinder-consistencygroup_delete_cgsnapshot: { key: 'consistencygroup:delete_cgsnapshot', value: 'group:nobody' }, \ cinder-consistencygroup_get_cgsnapshot: { key: 'consistencygroup:get_cgsnapshot', value: 'group:nobody' }, \ cinder-consistencygroup_get_all_cgsnapshots: { key: 'consistencygroup:get_all_cgsnapshots', value: 'group:nobody' }, \ }
-
The value
‘group:nobody’
determines that no group can use this feature so it is effectively disabled. To enable it, change the group to another value. For increased security, set the permissions for both consistency group API and volume type management API to be identical. The volume type management API is set to
"rule:admin_or_owner"
by default in the same/etc/cinder/policy.json_ file
:"volume_extension:types_manage": "rule:admin_or_owner",
To make the consistency groups feature available to all users, set the API policy entries to allow users to create, use, and manage their own consistency groups. To do so, use
rule:admin_or_owner
:CinderApiPolicies: { \ cinder-consistencygroup_create: { key: 'consistencygroup:create', value: 'rule:admin_or_owner' }, \ cinder-consistencygroup_delete: { key: 'consistencygroup:delete', value: 'rule:admin_or_owner' }, \ cinder-consistencygroup_update: { key: 'consistencygroup:update', value: 'rule:admin_or_owner' }, \ cinder-consistencygroup_get: { key: 'consistencygroup:get', value: 'rule:admin_or_owner' }, \ cinder-consistencygroup_get_all: { key: 'consistencygroup:get_all', value: 'rule:admin_or_owner' }, \ cinder-consistencygroup_create_cgsnapshot: { key: 'consistencygroup:create_cgsnapshot', value: 'rule:admin_or_owner' }, \ cinder-consistencygroup_delete_cgsnapshot: { key: 'consistencygroup:delete_cgsnapshot', value: 'rule:admin_or_owner' }, \ cinder-consistencygroup_get_cgsnapshot: { key: 'consistencygroup:get_cgsnapshot', value: 'rule:admin_or_owner' }, \ cinder-consistencygroup_get_all_cgsnapshots: { key: 'consistencygroup:get_all_cgsnapshots', value: 'rule:admin_or_owner’ }, \ }
- Save the updates to your environment file.
- Add your environment file to the stack with your other environment files and deploy the overcloud.
2.9.2. Creating Block Storage consistency groups with the Dashboard
After you enable the consistency groups API, you can start creating consistency groups.
Prerequisites
- You must be a project administrator or a volume owner to create consistency groups.
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard as an admin user or a volume owner.
- Select Project > Compute > Volumes > Volume Consistency Groups.
- Click Create Consistency Group.
- In the Consistency Group Information tab of the wizard, enter a name and description for your consistency group. Then, specify its Availability Zone.
- You can also add volume types to your consistency group. When you create volumes within the consistency group, the Block Storage service will apply compatible settings from those volume types. To add a volume type, click its + button from the All available volume types list.
- Click Create Consistency Group. It appears next in the Volume Consistency Groups table.
2.9.3. Managing Block Storage service consistency groups with the Dashboard
You can manage consistency groups for Block Storage volumes in the dashboard.
Prerequisites
- You must be a project administrator to manage consistency groups.
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard as an admin user.
- Select Project > Compute > Volumes > Volume Consistency Groups.
- Optional: You can change the name or description of a consistency group by selecting Edit Consistency Group from its Action column.
To add or remove volumes from a consistency group directly, find the consistency group you want to configure. In the Actions column of that consistency group, select Manage Volumes. This launches the Add/Remove Consistency Group Volumes wizard.
- To add a volume to the consistency group, click its + button from the All available volumes list.
- To remove a volume from the consistency group, click its - button from the Selected volumes list.
- Click Edit Consistency Group.
2.9.4. Creating and managing consistency group snapshots for the Block Storage service
After you add volumes to a consistency group, you can create snapshots from it.
Prerequisites
- You must be a project administrator to create and manage consistency group snapshots.
Procedure
Source the overcloud credentials file:
$ source ~/<credentials_file>
-
Replace
<credentials_file>
with the name of your credentials file, for example,overcloudrc
.
-
Replace
List all available consistency groups and their respective IDs:
$ cinder consisgroup-list
Create snapshots using the consistency group:
$ cinder cgsnapshot-create [--name <cgsnapname>] [--description "<description>"] <cgnameid>
-
Replace
<cgsnapname>
with the name of the snapshot. -
Replace
<description>
with a description of the snapshot. -
Replace
<cgnameid>
with the name or ID of the consistency group.
-
Replace
Display a list of all available consistency group snapshots:
# cinder cgsnapshot-list
2.9.5. Cloning Block Storage service consistency groups
You can also use consistency groups to create a whole batch of pre-configured volumes simultaneously. You can do this by cloning an existing consistency group or restoring a consistency group snapshot. Both processes use the same command.
Prerequisites
- You must be a project administrator to clone consistency groups and restore consistency group snapshots.
Procedure
Source the overcloud credentials file:
$ source ~/<credentials_file>
-
Replace
<credentials_file>
with the name of your credentials file, for example,overcloudrc
.
-
Replace
To clone an existing consistency group:
$ cinder consisgroup-create-from-src --source-cg <cgnameid> [--name <cgname>] [--description "<description>"]
-
Replace
<cgnameid>
with the name or ID of the consistency group you want to clone. -
Replace
<cgname>
with the name of your consistency group. -
Replace
<description>
with a description of your consistency group.
-
Replace
To create a consistency group from a consistency group snapshot:
$ cinder consisgroup-create-from-src --cgsnapshot <cgsnapname> [--name <cgname>] [--description "<description>"]
-
Replace
<cgsnapname>
with the name or ID of the snapshot you are using to create the consistency group.
-
Replace
2.10. Configuring the default Block Storage scheduler filters
If the volume back end is not specified during volume creation, then the Block Storage scheduler uses filters to select suitable back ends. Ensure that you configure the following default filters:
- AvailabilityZoneFilter
- Filters out all back ends that do not meet the availability zone requirements of the requested volume.
- CapacityFilter
- Selects only back ends with enough space to accommodate the volume.
- CapabilitiesFilter
- Selects only back ends that can support any specified settings in the volume.
- InstanceLocality
- Configures clusters to use volumes local to the same node.
Prerequisites
- The undercloud is installed. For more information, see Installing director in Director Installation and Usage.
Procedure
-
Log in to the undercloud host as the
stack
user. Source the
stackrc
undercloud credentials file:$ source ~/stackrc
Add an environment file to your overcloud deployment command that contains the following parameters:
parameter_defaults: ControllerExtraConfig: # 1 cinder::config::cinder_config: DEFAULT/scheduler_default_filters: value: 'AvailabilityZoneFilter,CapacityFilter,CapabilitiesFilter,InstanceLocality'
- 1
- You can also add the
ControllerExtraConfig:
hook and its nested sections to theparameter_defaults:
section of an existing environment file.
- Save the updates to your environment file.
- Add your environment file to the stack with your other environment files and deploy the overcloud.
2.11. Enabling LVM2 filtering on overcloud nodes
If you use LVM2 (Logical Volume Management) volumes with certain Block Storage service (cinder) back ends, the volumes that you create inside Red Hat OpenStack Platform (RHOSP) guests might become visible on the overcloud nodes that host cinder-volume
or nova-compute
containers. In this case, the LVM2 tools on the host scan the LVM2 volumes that the OpenStack guest creates, which can result in one or more of the following problems on Compute or Controller nodes:
- LVM appears to see volume groups from guests
- LVM reports duplicate volume group names
- Volume detachments fail because LVM is accessing the storage
- Guests fail to boot due to problems with LVM
- The LVM on the guest machine is in a partial state due to a missing disk that actually exists
- Block Storage service (cinder) actions fail on devices that have LVM
- Block Storage service (cinder) snapshots fail to remove correctly
-
Errors during live migration:
/etc/multipath.conf
does not exist
To prevent this erroneous scanning, and to segregate guest LVM2 volumes from the host node, you can enable and configure a filter with the LVMFilterEnabled
heat parameter when you deploy or update the overcloud. This filter is computed from the list of physical devices that host active LVM2 volumes. You can also allow and deny block devices explicitly with the LVMFilterAllowlist
and LVMFilterDenylist
parameters. You can apply this filtering globally, to specific node roles, or to specific devices.
Prerequisites
- The undercloud is installed. For more information, see Installing director in Director Installation and Usage.
Procedure
-
Log in to the undercloud host as the
stack
user. Source the
stackrc
undercloud credentials file:$ source ~/stackrc
Add an environment file to your overcloud deployment command that contains the following parameter:
parameter_defaults: LVMFilterEnabled: true
You can further customize the implementation of the LVM2 filter. For example, to enable filtering only on Compute nodes, use the following configuration:
parameter_defaults: ComputeParameters: LVMFilterEnabled: true
These parameters also support regular expression. To enable filtering only on Compute nodes, and ignore all devices that start with
/dev/sd
, use the following configuration:parameter_defaults: ComputeParameters: LVMFilterEnabled: true LVMFilterDenylist: - /dev/sd.*
- Save the updates to your environment file.
- Add your environment file to the stack with your other environment files and deploy the overcloud.
2.12. Multipath configuration
Use multipath to configure multiple I/O paths between server nodes and storage arrays into a single device to create redundancy and improve performance.
2.12.1. Using director to configure multipath
You can configure multipath on a Red Hat OpenStack Platform (RHOSP) overcloud deployment for greater bandwidth and networking resiliency.
When you configure multipath on an existing deployment, the new workloads are multipath aware. If you have any pre-existing workloads, you must shelve and unshelve the instances to enable multipath on these instances.
Prerequisites
- The undercloud is installed. For more information, see Installing director in Director Installation and Usage.
Procedure
-
Log in to the undercloud host as the
stack
user. Source the
stackrc
undercloud credentials file:$ source ~/stackrc
Use an overrides environment file or create a new one, for example
multipath_overrides.yaml
. Add and set the following parameter:parameter_defaults: ExtraConfig: cinder::config::cinder_config: backend_defaults/use_multipath_for_image_xfer: value: true
NoteThe default settings will generate a basic multipath configuration that works for most environments. However, check with your storage vendor for recommendations, because some vendors have optimized configurations that are specific to their hardware. For more information about multipath, see Configuring device mapper multipath.
Optional: If you have a multipath configuration file for your overcloud deployment, then you can use the
MultipathdCustomConfigFile
parameter to specify the location of this file:parameter_defaults: MultipathdCustomConfigFile: <config_file_directory>/<config_file_name>
In the following example,
/home/stack
is the directory of the multipath configuration file andmultipath.conf
is the name of this file:parameter_defaults: MultipathdCustomConfigFile: /home/stack/multipath.conf
NoteOther TripleO multipath parameters override any corresponding value in the local custom configuration file. For example, if
MultipathdEnableUserFriendlyNames
isFalse
, the files on the overcloud nodes are updated to match, even if the setting is enabled in the local custom file.For more information about multipath parameters, see Multipath heat template parameters.
- Save the updates to your overrides environment file.
Add your overrides environment file to the stack with your other environment files, such as:
---- /usr/share/openstack-tripleo-heat-templates/environments/multipathd.yaml ----
- Deploy the overcloud.
Additional resources
- Shelving an instance in Creating and Managing Instances
2.12.1.1. Multipath heat template parameters
Use this to understand the following parameters that enable multipath.
Parameter | Description | Default value |
---|---|---|
|
Defines whether to enable the multipath daemon. This parameter defaults to |
|
| Defines whether to enable the assignment of a user friendly name to each path. |
|
| Defines whether to automatically create a multipath device for each path. |
|
| Defines whether to skip automatically creating partitions on the device. |
|
|
Includes a local, custom multipath configuration file on the overcloud nodes. By default, a minimal
NOTE: Other TripleO multipath parameters override any corresponding value in any local, custom configuration file that you add. For example, if |
2.12.2. Verifying multipath configuration
You can verify multipath configuration on new or existing overcloud deployments.
Procedure
- Create an instance.
- Attach a non-encrypted volume to the instance.
Get the name of the Compute node that contains the instance:
$ nova show <instance> | grep OS-EXT-SRV-ATTR:host
Replace
<instance>
with the name of the instance that you created.Retrieve the virsh name of the instance:
$ nova show <instance> | grep instance_name
Get the IP address of the Compute node:
$ . stackrc $ metalsmith list | grep <compute_name>
Replace
<compute_name>
with the name from the output of thenova show <instance>
command to display two rows, from a table of six columns.Find the row in which
<compute_name>
is in the fourth column. The IP address of<compute_name>
is in the last column of this row.In the following example, the IP address of compute-0 is 192.168.24.15 because compute-0 is in the fourth column of the second row:
$ . stackrc $ metalsmith list | grep compute-0 | 3b1bf72e-c425-494c-9717-d0b89bb66580 | compute-0 | 95b21d3e-36be-470d-ba5c-70d5dcd6d0b3 | compute-1 | ACTIVE | ctlplane=192.168.24.49 | | 72a24883-25f9-435c-bf71-a20e66be172d | compute-1 | a59f79f7-006e-4f38-a9ad-8164da47d58e | compute-0 | ACTIVE | ctlplane=192.168.24.15 |
SSH into the Compute node that runs the instance:
$ ssh tripleo-admin@<compute_node_ip>
Replace
<compute_node_ip>
with the IP address of the Compute node.Log in to the container that runs virsh:
$ podman exec -it nova_libvirt /bin/bash
Enter the following command on a Compute node instance to verify that it is using multipath in the cinder volume host location:
virsh domblklist <virsh_instance_name> | grep /dev/dm
Replace
<virsh_instance_name>
with the output of thenova show <instance> | grep instance_name
command.If the instance shows a value other than
/dev/dm-
, the connection is non-multipath and you must refresh the connection info with thenova shelve
andnova unshelve
commands:$ nova shelve <instance> $ nova unshelve <instance>
NoteIf you have more than one type of back end, you must verify the instances and volumes on all back ends, because connection info that each back end returns might vary.
Chapter 3. Performing basic operations with the Block Storage service (cinder)
Create and configure Block Storage volumes as the primary form of persistent storage for Compute instances in your overcloud. Create volumes, attach your volumes to instances, edit and resize your volumes, and modify volume ownership.
3.1. Creating Block Storage volumes
Create volumes to provide persistent storage for instances that you launch with the Compute service (nova) in the overcloud.
To create an encrypted volume, you must first have a volume type configured specifically for volume encryption. In addition, you must configure both Compute and Block Storage services to use the same static key. For information about how to set up the requirements for volume encryption, see Block Storage service (cinder) volume encryption.
The default maximum number of volumes you can create for a project is 10.
Prerequisites
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard.
- Select Project > Compute > Volumes.
Click Create Volume, and edit the following fields:
Field Description Volume name
Name of the volume.
Description
Optional, short description of the volume.
Type
Optional volume type. For more information, see Group volume configuration with volume types.
If you create a volume and do not specify a volume type, then Block Storage uses the default volume type. For more information on defining default volume types, see Defining a project-specific default volume type.
If you do not specify a back end, the Block Storage scheduler will try to select a suitable back end for you. For more information, see Volume allocation on multiple back ends.
NoteIf there is no suitable back end then the volume will not be created.
You can also change the volume type after the volume has been created. For more information, see Block Storage volume retyping.
Size (GB)
Volume size (in gigabytes).
If you want to create an encrypted volume from an unencrypted image, you must ensure that the volume size is larger than the image size so that the encryption data does not truncate the volume data.
Availability Zone
Availability zones (logical server groups), along with host aggregates, are a common method for segregating resources within OpenStack. Availability zones are defined during installation. For more information about availability zones and host aggregates, see Creating and managing host aggregates in the Configuring the Compute Service for Instance Creation guide.
Specify a Volume Source:
Source Description No source, empty volume
The volume is empty and does not contain
a file system or partition table.
Snapshot
Use an existing snapshot as a volume source. If you select this option, a new Use snapshot as a source list opens; you can then choose a snapshot from the list. If you want to create a new volume from a snapshot of an encrypted volume, you must ensure that the new volume is at least 1GB larger than the old volume. For more information about volume snapshots, see Creating new volumes from snapshots.
Image
Use an existing image as a volume source. If you select this option, a new Use snapshot as a source list opens; you can then choose an image from the list.
Volume
Use an existing volume as a volume source. If you select this option, a new Use snapshot as a source list opens; you can then choose a volume from the list.
- Click Create Volume. After the volume is created, its name appears in the Volumes table.
3.2. Editing a volume name or description
You can change the names and descriptions of your volumes in the dashboard.
Prerequisites
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard.
- Select Project > Compute > Volumes.
- Select the volume’s Edit Volume button.
- Edit the volume name or description as required.
- Click Edit Volume to save your changes.
3.3. Resizing (extending) a Block Storage service volume
Resize volumes to increase the storage capacity of the volumes.
The ability to resize a volume in use is supported but is driver dependent. RBD is supported. You cannot extend in-use multi-attach volumes. For more information about support for this feature, contact Red Hat Support.
Procedure
- Source your credentials file.
List the volumes to retrieve the ID of the volume you want to extend:
$ cinder list
Increase the size of the volume:
$ cinder extend <volume_id> <size>
-
Replace
<volume_id>
with the ID of the volume you want to extend. Replace
<size>
with the required size of this volume, in gigabytes.NoteEnsure that the specified size is greater than the existing size of this volume.
For example:
$ cinder extend 573e024d-5235-49ce-8332-be1576d323f8 10
-
Replace
3.4. Deleting a Block Storage service volume
You can delete volumes that you no longer require.
You cannot delete a volume if it has existing snapshots. For more information about deleting snapshots, see Deleting volume snapshots.
Prerequisites
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard.
- Select Project > Compute > Volumes.
- In the Volumes table, select the volume to delete.
- Click Delete Volumes.
3.5. Volume allocation on multiple back ends
When you create a volume, you can select the volume type for the required back end from the Type list. For more information, see Creating Block Storage volumes.
If the Block Storage service (cinder) is configured to use multiple back ends, then a volume type must be created for each back end.
If you do not specify a back end when creating the volume, the Block Storage scheduler will try to select a suitable back end for you.
The scheduler uses filters, for the following default associated settings of the volume, to select suitable back ends:
- AvailabilityZoneFilter
- Filters out all back ends that do not meet the availability zone requirements of the requested volume.
- CapacityFilter
- Selects only back ends with enough space to accommodate the volume.
- CapabilitiesFilter
- Selects only back ends that can support any specified settings in the volume.
- InstanceLocality
- Configures clusters to use volumes local to the same node.
If there is more than one suitable back end, then the scheduler uses a weighting method to pick the best back end. By default, the CapacityWeigher method is used, so that the filtered back end with the most available free space is selected.
If there is no suitable back end then the volume will not be created.
3.6. Attaching a volume to an instance
When you close an instance all the data is lost. You can attach a volume for persistent storage. You can attach a volume to only one instance at a time, unless it has a multi-attach volume type. For more information about creating multi-attach volumes, see Volumes that can be attached to multiple instances.
Prerequisites
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard.
- Select Project > Compute > Volumes.
- Select the Edit Attachments action. If the volume is not attached to an instance, the Attach To Instance drop-down list is visible.
- From the Attach To Instance list, select the instance to which you want to attach the volume.
- Click Attach Volume.
3.7. Detaching a volume from an instance
You must detach a volume from an instance when you want to attach this volume to another instance, unless it has a multi-attach volume type. You must also detach a volume to change the access permissions to the volume or to delete the volume.
Prerequisites
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard.
- Select Project > Compute > Volumes.
- Select the volume’s Manage Attachments action. If the volume is attached to an instance, the instance’s name is displayed in the Attachments table.
- Click Detach Volume in this and the next dialog screen.
Next steps
3.8. Configuring the access rights to a volume
The default state of a volume is read-write to allow data to be written to and read from it. You can mark a volume as read-only to protect its data from being accidentally overwritten or deleted.
After changing a volume to be read-only you can change it back to read-write again.
Prerequisites
- If the volume is already attached to an instance, then detach this volume. For more information, see Detaching a volume from an instance.
Procedure
- Source your credentials file.
List the volumes to retrieve the ID of the volume you want to configure:
$ cinder list
Set the required access rights for this volume:
To set the access rights of a volume to read-only:
$ cinder readonly-mode-update <volume_id> true
-
Replace
<volume_id>
with the ID of the required volume.
-
Replace
To set the access rights of a volume to read-write:
$ cinder readonly-mode-update <volume_id> false
- If you detached this volume from an instance to change the access rights, then re-attach the volume. For more information, see Attaching a volume to an instance.
3.9. Changing a volume owner with the Dashboard
To change a volume’s owner, you will have to perform a volume transfer. A volume transfer is initiated by the volume’s owner, and the volume’s change in ownership is complete after the transfer is accepted by the volume’s new owner.
Prerequisites
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard as the volume owner.
- Select Projects > Volumes.
- In the Actions column of the volume to transfer, select Create Transfer.
In the Create Transfer dialog box, enter a name for the transfer and click Create Volume Transfer.
The volume transfer is created, and in the Volume Transfer screen you can capture the
transfer ID
and theauthorization key
to send to the recipient project.Click the Download transfer credentials button to download a
.txt
file containing thetransfer name
,transfer ID
, andauthorization key
.NoteThe authorization key is available only in the Volume Transfer screen. If you lose the authorization key, you must cancel the transfer and create another transfer to generate a new authorization key.
Close the Volume Transfer screen to return to the volume list.
The volume status changes to
awaiting-transfer
until the recipient project accepts the transfer
Accept a volume transfer from the dashboard
- Log into the dashboard as the recipient project owner.
- Select Projects > Volumes.
- Click Accept Transfer.
In the Accept Volume Transfer dialog box, enter the
transfer ID
and theauthorization key
that you received from the volume owner and click Accept Volume Transfer.The volume now appears in the volume list for the active project.
3.10. Changing a volume owner with the CLI
To change a volume’s owner, you will have to perform a volume transfer. A volume transfer is initiated by the volume’s owner, and the volume’s change in ownership is complete after the transfer is accepted by the volume’s new owner.
Procedure
- Log in as the volume’s current owner.
List the available volumes:
$ cinder list
Initiate the volume transfer:
$ cinder transfer-create <volume>
Replace
<volume>
with the name or ID of the volume you wish to transfer. For example:+------------+--------------------------------------+ | Property | Value | +------------+--------------------------------------+ | auth_key | f03bf51ce7ead189 | | created_at | 2014-12-08T03:46:31.884066 | | id | 3f5dc551-c675-4205-a13a-d30f88527490 | | name | None | | volume_id | bcf7d015-4843-464c-880d-7376851ca728 | +------------+--------------------------------------+
The
cinder transfer-create
command clears the ownership of the volume and creates anid
andauth_key
for the transfer. These values can be given to, and used by, another user to accept the transfer and become the new owner of the volume.The new user can now claim ownership of the volume. To do so, the user should first log in from the command line and run:
$ cinder transfer-accept <transfer_id> <transfer_key>
-
Replace
<transfer_id>
with theid
value returned by thecinder transfer-create
command. Replace
<transfer_key>
with theauth_key
value returned by thecinder transfer-create
command.For example:
$ cinder transfer-accept 3f5dc551-c675-4205-a13a-d30f88527490 f03bf51ce7ead189
-
Replace
You can view all available volume transfers using:
$ cinder transfer-list
Chapter 4. Performing advanced operations with the Block Storage service (cinder)
Block Storage volumes form persistent storage for Compute instances in your overcloud. Configure advanced features of your volumes, for example, using volume snapshots, creating multi-attach volumes, retyping volumes, and migrating volumes.
4.1. Creating volume snapshots
You can preserve the state of a volume at a specific point in time by creating a volume snapshot. You can then use the snapshot to clone new volumes.
Volume backups are different from snapshots. Backups preserve the data contained in the volume, whereas snapshots preserve the state of a volume at a specific point in time. You cannot delete a volume if it has existing snapshots. Volume backups prevent data loss, whereas snapshots facilitate cloning.
For this reason, snapshot back ends are typically colocated with volume back ends to minimize latency during cloning. By contrast, a backup repository is usually located in a different location, for example, on a different node, physical storage, or even geographical location in a typical enterprise deployment. This is to protect the backup repository from any damage that might occur to the volume back end.
For more information about volume backups, see the Block Storage Backup Guide.
Prerequisites
- A volume that you want to snapshot. For more information about creating volumes, see Creating Block Storage volumes.
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard.
- Select Project > Compute > Volumes.
- Select the Create Snapshot action for the target volume.
- Provide a Snapshot Name for the snapshot and click Create a Volume Snapshot. The Volume Snapshots tab displays all snapshots.
For RADOS block device (RBD) volumes for the Block Storage service (cinder) that are created from snapshots, you can use the CinderRbdFlattenVolumeFromSnapshot
heat parameter to flatten and remove the dependency on the snapshot. When you set CinderRbdFlattenVolumeFromSnapshot
to true
, the Block Storage service flattens RBD volumes and removes the dependency on the snapshot and also flattens all future snapshots. The default value is false
, which is also the default value for the cinder RBD driver.
Be aware that flattening a snapshot removes any potential block sharing with the parent and results in larger snapshot sizes on the back end and increases the time for snapshot creation.
Verification
Verify that the new snapshot is present in the Volume Snapshots tab, or use the CLI to list volume snapshots and verify that the snapshot is created:
$ openstack volume snapshot list
4.2. Creating new volumes from snapshots
You can create new volumes as clones of volume snapshots. These snapshots preserve the state of a volume at a specific point in time.
Prerequisites
- A volume snapshot that you want to clone and create a new volume from. For more information about creating volume snapshots, see Creating volume snapshots
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard.
- Select Project > Compute > Volumes.
- In the Volume Snapshots table, select the Create Volume action for the snapshot that you want to create a new volume from. For more information about volume creation, see Creating Block Storage volumes.
If you want to create a new volume from a snapshot of an encrypted volume, ensure that the new volume is at least 1GB larger than the old volume.
Verification
Verify that the new volume is present in the Volumes tab, or use the CLI to list volumes and verify that the new volume is created:
$ openstack volume list
4.3. Deleting volume snapshots
Red Hat OpenStack Platform (RHOSP) 17.0 uses the RBD CloneV2 API, which means that you can delete volume snapshots even if they have dependencies. If your RHOSP deployment uses a director-deployed Ceph back end, the Ceph cluster is configured correctly by director.
If you use an external Ceph back end, you must configure the minimum client on the Ceph cluster. For more information about configuring an external Ceph cluster, see Configuring the existing Red Hat Ceph Storage cluster in Integrating an Overcloud with an Existing Red Hat Ceph Storage Cluster.
Prerequisites
- A volume snapshot that you want to delete.
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard.
- Select Project > Compute > Volumes.
- In the Volume Snapshots table, select the Delete Volume Snapshot action for the snapshot that you want to delete.
If your OpenStack deployment uses a Red Hat Ceph back end, for more information about snapshot security and troubleshooting, see Protected and unprotected snapshots in a Red Hat Ceph Storage back end.
Verification
Verify that the snapshot is no longer present in the Volume Snapshots tab, or use the CLI to list volume snapshots and verify that the snapshot is deleted:
$ openstack volume snapshot list
4.4. Restoring a volume from a snapshot
You can recover the most recent snapshot of a volume. This means that you can perform an in-place revert of the volume data to its most recent snapshot.
The ability to recover the most recent snapshot of a volume is supported but is driver dependent. The correct implementation of this feature is driver assisted. For more information about support for this feature, contact your driver vendor.
Limitations
- There might be limitations to using the revert-to-snapshot feature with multi-attach volumes. Check whether such limitations apply before you use this feature.
- You cannot revert a volume that you resize (extend) after you take a snapshot.
- You cannot use the revert-to-snapshot feature on an attached or in-use volume.
Prerequisites
- Block Storage (cinder) REST API microversion 3.40 or later.
- You must have created at least one snapshot for the volume.
Procedure
- Source your credentials file.
Detach your volume:
$ nova volume-detach <instance_id> <vol_id>
Replace
<instance_id>
and<vol_id>
with the IDs of the instance and volume that you want to revert.Locate the ID or name of the snapshot that you want to revert. You can only revert the latest snapshot.
$ cinder snapshot-list
Revert the snapshot:
$ cinder --os-volume-api-version=3.40 revert-to-snapshot <snapshot_id or snapshot_name>
Replace
<snapshot_id or snapshot_name>
with the ID or the name of the snapshot.Optional: You can use the
cinder snapshot-list
command to check that the volume you are reverting is in a reverting state.$ cinder snapshot-list
Reattach the volume:
$ nova volume-attach <instance_id> <vol_id>
Replace
<instance_id>
and<vol_id>
with the IDs of the instance and volume that you reverted.
Verification
To check that the procedure is successful, you can use the
cinder list
command to verify that the volume you reverted is now in the available state.$ cinder list
If you used Block Storage (cinder) as a bootable root volume, you cannot use the revert-to-snapshot feature on that volume because it is not in the available state. To use this feature, the instance must have been booted with the delete_on_termination=false
(default) property to preserve the boot volume if the instance is terminated. When you want to revert to a snapshot, you must first delete the initial instance so that the volume is available. You can then revert it and create a new instance from the volume.
4.5. Uploading a volume to the Image service (glance)
You can upload an existing volume as an image to the Image service directly.
Prerequisites
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard.
- Select Project > Compute > Volumes.
- Select the target volume’s Upload to Image action.
- Provide an Image Name for the volume and select a Disk Format from the list.
- Click Upload.
To view the uploaded image, select Project > Compute > Images. The new image appears in the Images table. For information on how to use and configure images, see Creating and Managing Images.
4.6. Volumes that can be attached to multiple instances
You can create a multi-attach Block Storage volume that can be attached to multiple instances and these instances can simultaneously read and write to it. Multi-attach volumes require a multi-attach volume type.
You must use a multi-attach or cluster-aware file system to manage write operations from multiple instances. Failure to do so causes data corruption.
Limitations of multi-attach volumes
- The Block Storage (cinder) back end must support multi-attach volumes. For information about supported back ends, contact Red Hat Support.
Your Block Storage (cinder) driver must support multi-attach volumes. The Ceph RBD driver is supported. Contact Red Hat support to verify that multi-attach is supported for your vendor plugin. For more information about the certification for your vendor plugin, see the following locations:
- Read-only multi-attach volumes are not supported.
- Live migration of multi-attach volumes is not available.
- Encryption of multi-attach volumes is not supported.
- Multi-attach volumes are not supported by the Bare Metal Provisioning service (ironic) virt driver. Multi-attach volumes are supported only by the libvirt virt driver.
- You cannot retype an attached volume from a multi-attach type to a non-multi-attach type, and you cannot retype a non-multi-attach type to a multi-attach type.
- You cannot use multi-attach volumes that have multiple read write attachments as the source or destination volume during an attached volume migration.
- You cannot attach multi-attach volumes to shelved offloaded instances.
4.6.1. Creating a multi-attach volume type
To attach a volume to multiple instances, set the multiattach
flag to <is> True
in the volume extra specs. When you create a multi-attach volume type, the volume inherits the flag and becomes a multi-attach volume.
Prerequisites
- You must be a project administrator to create a volume type.
Procedure
Source the overcloud credentials file:
$ source ~/<credentials_file>
-
Replace
<credentials_file>
with the name of your credentials file, for example,overcloudrc
.
-
Replace
Create a new volume type for multi-attach volumes:
$ cinder type-create multiattach
Enable the
multiattach
property for this multi-attach volume type:$ cinder type-key multiattach set multiattach="<is> True"
Run the following command to specify the back end:
$ cinder type-key multiattach set volume_backend_name=<backend_name>
4.6.2. Multi-attach volume retyping
You can retype a volume to be multi-attach capable or retype a multi-attach capable volume to make it incapable of attaching to multiple instances. However, you can retype a volume only when it is not in use and its status is available
.
When you attach a multi-attach volume, some hypervisors require special considerations, such as when you disable caching. Currently, there is no way to safely update an attached volume while keeping it attached the entire time. Retyping fails if you attempt to retype a volume that is attached to multiple instances.
4.6.3. Creating a multi-attach volume
You can create a Block Storage volume that can be attached to multiple instances and these instances can simultaneously read and write to it.
This procedure creates a volume on any back end that supports multiattach
. Therefore, if there are two back ends that support multiattach
, the scheduler decides which back end to use. For more information, see Volume allocation on multiple back ends.
Prerequisites
- A multi-attach volume type is available in your project.
Procedure
- Source your credentials file.
Run the following command to create a multi-attach volume:
$ cinder create <volume_size> --name <volume_name> --volume-type multiattach
Run the following command to verify that a volume is multi-attach capable. If the volume is multi-attach capable, the
multiattach
field equalsTrue
.$ cinder show <vol_id> | grep multiattach | multiattach | True |
Next steps
4.7. Moving volumes between back ends
There are many reasons to move volumes from one storage back end to another, such as:
- To retire storage systems that are no longer supported.
- To change the storage class or tier of a volume.
- To change the availability zone of a volume.
With the Block Storage service (cinder), you can move volumes between back ends in the following ways:
- Retype: Only volume owners and administrators can retype volumes. The retype operation is the most common way to move volumes between back ends. For more information, see Block Storage volume retyping.
- Migrate: Only administrators can migrate volumes. Volume migration is reserved for specific use cases, because it is restrictive and requires a clear understanding about how deployments work. For more information, see Migrating a volume between back ends with the Dashboard or Migrating a volume between back ends with the CLI.
Restrictions
Red Hat supports moving volumes between back ends within and across availability zones (AZs), but with the following restrictions:
- Volumes must have either available or in-use status to move.
- Support for in-use volumes is driver dependent.
- Volumes cannot have snapshots.
- Volumes cannot belong to a group or consistency group.
4.7.1. Moving available volumes
You can move available volumes between all back ends, but performance depends on the back ends that you use. Many back ends support assisted migration. For more information about back-end support for assisted migration, contact the vendor.
Assisted migration works with both volume retype and volume migration. With assisted migration, the back end optimizes the movement of the data from the source back end to the destination back end, but both back ends must be from the same vendor.
Red Hat supports back-end assisted migrations only with multi-pool back ends or when you use the cinder migrate operation for single-pool back ends, such as RBD.
When assisted migrations between back ends are not possible, the Block Storage service performs a generic volume migration.
Generic volume migration requires volumes on both back ends to be connected before the Block Storage (cinder) service moves data from the source volume to the Controller node and from the Controller node to the destination volume. The Block Storage service seamlessly performs the process regardless of the type of storage from the source and destination back ends.
Ensure that you have adequate bandwidth before you perform a generic volume migration. The duration of a generic volume migration is directly proportional to the size of the volume, which makes the operation slower than assisted migration.
4.7.2. Moving in-use volumes
There is no optimized or assisted option for moving in-use volumes. When you move in-use volumes, the Compute service (nova) must use the hypervisor to transfer data from a volume in the source back end to a volume in the destination back end. This requires coordination with the hypervisor that runs the instance where the volume is in use.
The Block Storage service (cinder) and the Compute service work together to perform this operation. The Compute service manages most of the work, because the data is copied from one volume to another through the Compute node.
Ensure that you have adequate bandwidth before you move in-use volumes. The duration of this operation is directly proportional to the size of the volume, which makes the operation slower than assisted migration.
Restrictions
- In-use multi-attach volumes cannot be moved while they are attached to more than one nova instance.
- Non block devices are not supported, which limits storage protocols on the target back end to be iSCSI, Fibre Channel (FC), and RBD.
4.8. Block Storage volume retyping
When you retype a volume, you apply a volume type and its settings to an existing volume. For more information about volume types, see Group volume configuration with volume types.
Only volume owners and administrators can retype volumes.
You can retype a volume provided that the extra specs of the new volume type can be applied to the existing volume. You can retype a volume to apply predefined settings or storage attributes to an existing volume, such as:
- To move the volume to a different back end.
- To change the storage class or tier of a volume.
- To enable or disable features such as replication.
Volume retyping is the standard way to move volumes from one back end to another. But retyping a volume does not necessarily mean that you must move the volume from one back end to another. However, there are circumstances in which you must move a volume to complete a retype:
-
The new volume type has a different
volume_backend_name
defined. -
The
volume_backend_name
of the current volume type is undefined, and the volume is stored in a different back end than the one specified by thevolume_backend_name
of the new volume type.
Moving a volume from one back end to another can require extensive time and resources. Therefore, when a retype requires moving data, the Block Storage service does not move data by default. The operation fails unless it is explicitly allowed by specifying a migration policy as part of the retype request. For more information, see Retyping a volume from the Dashboard or Retyping a volume from the CLI.
Restrictions
- You cannot retype all volumes. For more information about moving volumes between back ends, see Moving volumes between back ends.
- Unencrypted volumes cannot be retyped to encrypted volume types, but encrypted volumes can be retyped to unencrypted ones.
- Retyping an unencrypted volume to an encrypted volume of the same size is not supported, because encrypted volumes require additional space to store encryption data. For more information about encrypting unencrypted volumes, see Encrypting unencrypted volumes.
- Users with no administrative privileges can only retype volumes that they own.
Additional resources
4.8.1. Retyping a volume from the Dashboard
Retype a volume to apply a volume type and its settings to an existing volume.
Retyping an unencrypted volume to an encrypted volume of the same size is not supported, because encrypted volumes require additional space to store encryption data. For more information about encrypting unencrypted volumes, see Encrypting unencrypted volumes.
Prerequisites
- Only volume owners and administrators can retype volumes.
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard as an admin user or volume owner.
- Select Project > Compute > Volumes.
- In the Actions column of the volume you want to migrate, select Change Volume Type.
- In the Change Volume Type dialog, select the target volume type and define the new back end from the Type list.
- If you are migrating the volume to another back end, select On Demand from the Migration Policy list. For more information, see Moving volumes between back ends.
- Click Change Volume Type to start the migration.
4.8.2. Retyping a volume from the CLI
Retype a volume to apply a volume type and its settings to an existing volume.
Retyping an unencrypted volume to an encrypted volume of the same size is not supported, because encrypted volumes require additional space to store encryption data. For more information about encrypting unencrypted volumes, see Encrypting unencrypted volumes.
Prerequisites
- Only volume owners and administrators can retype volumes.
Procedure
- Source your credentials file.
Enter the following command to retype a volume:
$ cinder retype <volume name or id> <new volume type name>
If the retype operation requires moving the volume from one back end to another, the Block Storage service requires a specific flag:
$ cinder retype --migration-policy on-demand <volume name or id> <new volume type name>
4.9. Migrating a volume between back ends with the Dashboard
With the Block Storage service (cinder) you can migrate volumes between back ends within and across availability zones (AZs). This is the least common way to move volumes from one back end to another.
In highly customized deployments or in situations in which you must retire a storage system, an administrator can migrate volumes. In both use cases, multiple storage systems share the same volume_backend_name
, or it is undefined.
Restrictions
- The volume cannot be replicated.
- The destination back end must be different from the current back end of the volume.
The existing volume type must be valid for the new back end, which means the following must be true:
-
Volume type must not have the
backend_volume_name
defined in its extra specs, or both Block Storage back ends must be configured with the samebackend_volume_name
. - Both back ends must support the same features configured in the volume type, such as support for thin provisioning, support for thick provisioning, or other feature configurations.
-
Volume type must not have the
Moving volumes from one back end to another might require extensive time and resources. For more information, see Moving volumes between back ends.
Prerequisites
- You must be a project administrator to migrate volumes.
- Access to the Red Hat OpenStack Platform (RHOSP) Dashboard (horizon). For more information, see Introduction to the OpenStack Dashboard.
Procedure
- Log into the dashboard as an admin user.
- Select Admin > Volumes.
- In the Actions column of the volume you want to migrate, select Migrate Volume.
In the Migrate Volume dialog, select the target host from the Destination Host drop-down list.
NoteTo bypass any driver optimizations for the host migration, select the Force Host Copy check box.
- Click Migrate to start the migration.
4.10. Migrating a volume between back ends with the CLI
With the Block Storage service (cinder) you can migrate volumes between back ends within and across availability zones (AZs). This is the least common way to move volumes from one back end to another.
In highly customized deployments or in situations in which you must retire a storage system, an administrator can migrate volumes. In both use cases, multiple storage systems share the same volume_backend_name
, or it is undefined.
Restrictions
- The volume cannot be replicated.
- The destination back end must be different from the current back end of the volume.
The existing volume type must be valid for the new back end, which means the following must be true:
-
Volume type must not have the
backend_volume_name
defined in its extra specs, or both Block Storage back ends must be configured with the samebackend_volume_name
. - Both back ends must support the same features configured in the volume type, such as support for thin provisioning, support for thick provisioning, or other feature configurations.
-
Volume type must not have the
Moving volumes from one back end to another might require extensive time and resources. For more information, see Moving volumes between back ends.
Prerequisites
- You must be a project administrator to migrate volumes.
Procedure
Source the overcloud credentials file:
$ source ~/<credentials_file>
-
Replace
<credentials_file>
with the name of your credentials file, for example,overcloudrc
.
-
Replace
Enter the following command to retrieve the name of the destination back end:
$ cinder get-pools --detail Property | Value ... | name | localdomain@lvmdriver-1#lvmdriver-1 | pool_name | lvmdriver-1 ... | volume_backend_name | lvmdriver-1 ... Property | Value ... | | name | localdomain@lvmdriver-2#lvmdriver-1 | pool_name | lvmdriver-1 ... | volume_backend_name | lvmdriver-1 ...
The destination back-end names use this syntax:
host@volume_backend_name#pool
.In the example output, there are two LVM back ends exposed in the Block Storage service:
localdomain@lvmdriver-1#lvmdriver-1
andlocaldomain@lvmdriver-2#lvmdriver-1
. Notice that both back ends share the samevolume_backend_name
,lvmdriver-1
.Enter the following command to migrate a volume from one back end to another:
$ cinder migrate <volume id or name> <new host>
4.11. Encrypting unencrypted volumes
You can encrypt an unencrypted volume.
If the cinder-backup
service is available, then back up the unencrypted volume and then restore it to a new encrypted volume.
If the cinder-backup
service is unavailable, then create a glance image from the unencrypted volume and create a new encrypted volume from this image.
Prerequisites
- You must be a project administrator to create encrypted volumes.
- An unencrypted volume that you want to encrypt.
Procedure
The cinder-backup
service is available:
Source the overcloud credentials file:
$ source ~/<credentials_file>
-
Replace
<credentials_file>
with the name of your credentials file, for example,overcloudrc
.
-
Replace
Back up the current unencrypted volume:
cinder backup-create <unencrypted_volume>
-
Replace
<unencrypted_volume>
with the name or ID of the unencrypted volume.
-
Replace
Create a new encrypted volume:
cinder create <encrypted_volume_size> --volume-type <encrypted_volume_type>
-
Replace
<encrypted_volume_size>
with the size of the new volume in GB. This value must be larger than the size of the unencrypted volume by 1GB to accommodate the encryption metadata. -
Replace
<encrypted_volume_type>
with the encryption type that you require.
-
Replace
Restore the backup of the unencrypted volume to the new encrypted volume:
cinder backup-restore <backup> --volume <encrypted_volume>
-
Replace
<backup>
with the name or ID of the unencrypted volume backup. -
Replace
<encrypted_volume>
with the ID of the new encrypted volume.
-
Replace
The cinder-backup
service is unavailable:
Source the overcloud credentials file:
$ source ~/<credentials_file>
-
Replace
<credentials_file>
with the name of your credentials file, for example,overcloudrc
.
-
Replace
Create a glance image of the unencrypted volume:
cinder upload-to-image <unencrypted_volume> <new_image>
-
Replace
<unencrypted_volume>
with the name or ID of the unencrypted volume. -
Replace
<new_image>
with a name for the new image.
-
Replace
Create a new volume from the image that is 1GB larger than the image:
cinder volume create --size <size> --volume-type luks --image <new_image> <encrypted_volume_name>
-
Replace
<size>
with the size of the new volume. This value must be 1GB larger than the size of the old unencrypted volume. -
Replace
<new_image>
with the name of the image that you created from the unencrypted volume. -
Replace
<encrypted_volume_name>
with a name for the new encrypted volume.
-
Replace
4.12. Protected and unprotected snapshots in a Red Hat Ceph Storage back end
When you use Red Hat Ceph Storage (RHCS) as a back end for your Red Hat OpenStack Platform (RHOSP) deployment, you can set a snapshot to protected in the back end. Do not delete protected snapshots through the RHOSP dashboard or the cinder snapshot-delete
command because deletion fails.
When this occurs, set the snapshot to unprotected in the RHCS back end first. You can then delete the snapshot through RHOSP as normal.
For more information about protecting snapshots, see Protecting a block device snapshot and Unprotecting a block device snapshot in the Red Hat Ceph Storage Block Device Guide.
Chapter 5. Configuring the Object Storage service (swift)
The Red Hat OpenStack Platform (RHOSP) Object Storage service (swift) stores its objects, or data, in containers. Containers are similar to directories in a file system although they cannot be nested. Containers provide an easy way for users to store any kind of unstructured data. For example, objects can include photos, text files, or images. Stored objects are not compressed.
5.1. Object Storage rings
The Object Storage service (swift) uses a data structure called the ring to distribute partition space across the cluster. This partition space is core to the data durability engine in the Object Storage service. With rings, the Object Storage service can quickly and easily synchronize each partition across the cluster.
Rings contain information about Object Storage partitions and how partitions are distributed among the different nodes and disks. When any Object Storage component interacts with data, a quick lookup is performed locally in the ring to determine the possible partitions for each object.
The Object Storage service has three rings to store the following types of data:
- Account information
- Containers, to facilitate organizing objects under an account
- Object replicas
5.1.1. Checking cluster health
The Object Storage service (swift) runs many processes in the background to ensure long-term data availability, durability, and persistence. For example:
- Auditors constantly re-read database and object files and compare them by using checksums to make sure there is no silent bit-rot. Any database or object file that no longer matches its checksum is quarantined and becomes unreadable on that node. The replicators then copy one of the other replicas to make the local copy available again.
- Objects and files can disappear when you replace disks or nodes or when objects are quarantined. When this happens, replicators copy missing objects or database files to one of the other nodes.
The Object Storage service includes a tool called swift-recon
that collects data from all nodes and checks the overall cluster health.
Procedure
- Log in to one of the Controller nodes.
Run the following command:
[tripleo-admin@overcloud-controller-2 ~]$ sudo podman exec -it -u swift swift_object_server /usr/bin/swift-recon -arqlT --md5 ======================================================================--> Starting reconnaissance on 3 hosts (object) ======================================================================[2018-12-14 14:55:47] Checking async pendings [async_pending] - No hosts returned valid data. ======================================================================[2018-12-14 14:55:47] Checking on replication [replication_failure] low: 0, high: 0, avg: 0.0, total: 0, Failed: 0.0%, no_result: 0, reported: 3 [replication_success] low: 0, high: 0, avg: 0.0, total: 0, Failed: 0.0%, no_result: 0, reported: 3 [replication_time] low: 0, high: 0, avg: 0.0, total: 0, Failed: 0.0%, no_result: 0, reported: 3 [replication_attempted] low: 0, high: 0, avg: 0.0, total: 0, Failed: 0.0%, no_result: 0, reported: 3 Oldest completion was 2018-12-14 14:55:39 (7 seconds ago) by 172.16.3.186:6000. Most recent completion was 2018-12-14 14:55:42 (4 seconds ago) by 172.16.3.174:6000. ======================================================================[2018-12-14 14:55:47] Checking load averages [5m_load_avg] low: 1, high: 2, avg: 2.1, total: 6, Failed: 0.0%, no_result: 0, reported: 3 [15m_load_avg] low: 2, high: 2, avg: 2.6, total: 7, Failed: 0.0%, no_result: 0, reported: 3 [1m_load_avg] low: 0, high: 0, avg: 0.8, total: 2, Failed: 0.0%, no_result: 0, reported: 3 ======================================================================[2018-12-14 14:55:47] Checking ring md5sums 3/3 hosts matched, 0 error[s] while checking hosts. ======================================================================[2018-12-14 14:55:47] Checking swift.conf md5sum 3/3 hosts matched, 0 error[s] while checking hosts. ======================================================================[2018-12-14 14:55:47] Checking quarantine [quarantined_objects] low: 0, high: 0, avg: 0.0, total: 0, Failed: 0.0%, no_result: 0, reported: 3 [quarantined_accounts] low: 0, high: 0, avg: 0.0, total: 0, Failed: 0.0%, no_result: 0, reported: 3 [quarantined_containers] low: 0, high: 0, avg: 0.0, total: 0, Failed: 0.0%, no_result: 0, reported: 3 ======================================================================[2018-12-14 14:55:47] Checking time-sync 3/3 hosts matched, 0 error[s] while checking hosts. ======================================================================
Optional: Use the
--all
option to return additional output.This command queries all servers on the ring for the following data:
- Async pendings: If the cluster load is too high and processes cannot update database files fast enough, some updates occur asynchronously. These numbers decrease over time.
- Replication metrics: Review the replication timestamps; full replication passes happen frequently with few errors. An old entry, for example, an entry with a timestamp from six months ago, indicates that replication on the node has not completed in the last six months.
- Ring md5sums: This ensures that all ring files are consistent on all nodes.
-
swift.conf
md5sums: This ensures that all configuration files are consistent on all nodes. - Quarantined files: There must be no, or very few, quarantined files for all nodes.
- Time-sync: All nodes must be synchronized.
5.1.2. Increasing ring partition power
The ring power determines the partition to which a resource, such as an account, container, or object, is mapped. The partition is included in the path under which the resource is stored in a back-end file system. Therefore, changing the partition power requires relocating resources to new paths in the back-end file systems.
In a heavily populated cluster, a relocation process is time consuming. To avoid downtime, relocate resources while the cluster is still operating. You must do this without temporarily losing access to data or compromising the performance of processes, such as replication and auditing. For assistance with increasing ring partition power, contact Red Hat support.
5.1.3. Partition power recommendation for the Object Storage service
When using separate Red Hat OpenStack Platform (RHOSP) Object Storage service (swift) nodes, use a higher partition power value.
The Object Storage service distributes data across disks and nodes using modified hash rings. There are three rings by default: one for accounts, one for containers, and one for objects. Each ring uses a fixed parameter called partition power. This parameter sets the maximum number of partitions that can be created.
The partition power parameter is important and can only be changed for new containers and their objects. As such, it is important to set this value before initial deployment.
The default partition power value is 10
for environments that RHOSP director deploys. This is a reasonable value for smaller deployments, especially if you only plan to use disks on the Controller nodes for the Object Storage service.
The following table helps you to select an appropriate partition power if you use three replicas:
Partition Power | Maximum number of disks |
10 | ~ 35 |
11 | ~ 75 |
12 | ~ 150 |
13 | ~ 250 |
14 | ~ 500 |
Setting an excessively high partition power value (for example, 14
for only 40 disks) negatively impacts replication times.
To set the partition power, use the following resource:
parameter_defaults: SwiftPartPower: 11
You can also configure an additional object server ring for new containers. This is useful if you want to add more disks to an Object Storage service deployment that initially uses a low partition power.
Additional resources
- The Rings in swift upstream documentation
- Modifying the overcloud environment in Director Installation and Usage
5.1.4. Custom rings
As technology advances and demands for storage capacity increase, creating custom rings is a way to update existing Object Storage clusters.
When you add new nodes to a cluster, their characteristics might differ from those of the original nodes. Without custom adjustments, the larger capacity of the new nodes may be underused. Or, if weights change in the rings, data dispersion can become uneven, which reduces safety.
Automation might not keep pace with future technology trends. For example, some older Object Storage clusters in use today originated before SSDs were available.
The ring builder helps manage Object Storage as clusters grow and technologies evolve. For assistance with creating custom rings, contact Red Hat support.
5.2. Customizing the Object Storage service
Depending on the requirements of your Red Hat OpenStack Platform (RHOSP) environment, you might want to customize some of the default settings of the Object Storage service (swift) to optimize your deployment performance.
5.2.1. Configuring fast-post
By default, the Object Storage service (swift) copies an object whole whenever any part of its metadata changes. You can prevent this by using the fast-post feature. The fast-post feature saves time when you change the content types of multiple large objects.
To enable the fast-post feature, disable the object_post_as_copy
option on the Object Storage proxy service.
Procedure
Edit
swift_params.yaml
:cat > swift_params.yaml << EOF parameter_defaults: ExtraConfig: swift::proxy::copy::object_post_as_copy: False EOF
Include the parameter file when you deploy or update the overcloud:
openstack overcloud deploy [... previous args ...] -e swift_params.yaml
5.2.2. Enabling at-rest encryption
By default, objects uploaded to the Object Storage service (swift) are unencrypted. Because of this, it is possible to access objects directly from the file system. This can present a security risk if disks are not properly erased before they are discarded. Object Storage objects. For more information, see Encrypting Object Storage (swift) at-rest objects in Manage Secrets with OpenStack Key Manager.
5.2.3. Deploying a standalone Object Storage service cluster
You can use the composable role concept to deploy a standalone Object Storage service (swift) cluster with the bare minimum of additional services, for example, OpenStack Identity service (keystone) or HAProxy.
Procedure
-
Copy the
roles_data.yaml
from/usr/share/openstack-tripleo-heat-templates
. - Edit the new file.
- Remove unneeded controller roles, for example Aodh*, Ceilometer*, Ceph*, Cinder*, Glance*, Heat*, Ironic*, Manila*, Nova*, Octavia*, Swift*.
-
Locate the ObjectStorage role within
roles_data.yaml
. -
Copy this role to a new role within that same file and name it
ObjectProxy
. Replace
SwiftStorage
withSwiftProxy
in this role.The example
roles_data.yaml
file below shows sample roles.- name: Controller description: | Controller role that has all the controller services loaded and handles Database, Messaging and Network functions. CountDefault: 1 tags: - primary - controller networks: - External - InternalApi - Storage - StorageMgmt - Tenant HostnameFormatDefault: '%stackname%-controller-%index%' ServicesDefault: - OS::TripleO::Services::AuditD - OS::TripleO::Services::CACerts - OS::TripleO::Services::CertmongerUser - OS::TripleO::Services::Clustercheck - OS::TripleO::Services::Docker - OS::TripleO::Services::Ec2Api - OS::TripleO::Services::Etcd - OS::TripleO::Services::HAproxy - OS::TripleO::Services::Keepalived - OS::TripleO::Services::Kernel - OS::TripleO::Services::Keystone - OS::TripleO::Services::Memcached - OS::TripleO::Services::MySQL - OS::TripleO::Services::MySQLClient - OS::TripleO::Services::Ntp - OS::TripleO::Services::Pacemaker - OS::TripleO::Services::RabbitMQ - OS::TripleO::Services::Securetty - OS::TripleO::Services::Snmp - OS::TripleO::Services::Sshd - OS::TripleO::Services::Timezone - OS::TripleO::Services::TripleoFirewall - OS::TripleO::Services::TripleoPackages - OS::TripleO::Services::Vpp - name: ObjectStorage CountDefault: 1 description: | Swift Object Storage node role networks: - InternalApi - Storage - StorageMgmt disable_upgrade_deployment: True ServicesDefault: - OS::TripleO::Services::AuditD - OS::TripleO::Services::CACerts - OS::TripleO::Services::CertmongerUser - OS::TripleO::Services::Collectd - OS::TripleO::Services::Docker - OS::TripleO::Services::FluentdClient - OS::TripleO::Services::Kernel - OS::TripleO::Services::MySQLClient - OS::TripleO::Services::Ntp - OS::TripleO::Services::Securetty - OS::TripleO::Services::SensuClient - OS::TripleO::Services::Snmp - OS::TripleO::Services::Sshd - OS::TripleO::Services::SwiftRingBuilder - OS::TripleO::Services::SwiftStorage - OS::TripleO::Services::Timezone - OS::TripleO::Services::TripleoFirewall - OS::TripleO::Services::TripleoPackages - name: ObjectProxy CountDefault: 1 description: | Swift Object proxy node role networks: - InternalApi - Storage - StorageMgmt disable_upgrade_deployment: True ServicesDefault: - OS::TripleO::Services::AuditD - OS::TripleO::Services::CACerts - OS::TripleO::Services::CertmongerUser - OS::TripleO::Services::Collectd - OS::TripleO::Services::Docker - OS::TripleO::Services::FluentdClient - OS::TripleO::Services::Kernel - OS::TripleO::Services::MySQLClient - OS::TripleO::Services::Ntp - OS::TripleO::Services::Securetty - OS::TripleO::Services::SensuClient - OS::TripleO::Services::Snmp - OS::TripleO::Services::Sshd - OS::TripleO::Services::SwiftRingBuilder - OS::TripleO::Services::SwiftProxy - OS::TripleO::Services::Timezone - OS::TripleO::Services::TripleoFirewall - OS::TripleO::Services::TripleoPackages
Deploy the overcloud with your regular
openstack deploy
command, including the new roles.$ openstack overcloud deploy --templates -r roles_data.yaml -e [...]
5.2.4. Using external SAN disks
By default, when Red Hat OpenStack Platform (RHOSP) director deploys the Object Storage service (swift), Object Storage is configured and optimized to use independent local disks. This configuration ensures that the workload is distributed across all disks, which helps minimize performance impact during node failure or other system issues.
In performance-impacting events, an environment that uses a single SAN can experience decreased performance across all LUNs. The Object Storage service cannot mitigate performance issues in an environment that uses SAN disks. Therefore, use additional local disks for Object Storage to meet performance and disk space requirements. For more information, see Disk recommendation for the Object Storage service.
Using an external SAN for Object Storage requires evaluation on a per-case basis. For more information, contact Red Hat Support.
If you choose to use an external SAN for Object Storage, be aware of the following conditions:
- Red Hat does not provide support for issues related to performance that result from using an external SAN for Object Storage.
- Red Hat does not provide support for issues that arise outside of the core Object Storage service offering. For support with high availability and performance, contact your storage vendor.
- Red Hat does not test SAN solutions with the Object Storage service. For more information about compatibility, guidance, and support for third-party products, contact your storage vendor.
- Red Hat recommends that you evaluate and test performance demands with your deployment. To confirm that your SAN deployment is tested, supported, and meets your performance requirements, contact your storage vendor.
Procedure
This template is an example of how to use two devices (
/dev/mapper/vdb
and/dev/mapper/vdc
) for Object Storage:parameter_defaults: SwiftMountCheck: true SwiftUseLocalDir: false SwiftRawDisks: {"vdb": {"base_dir":"/dev/mapper/"}, "vdc": {"base_dir":"/dev/mapper/"}}
5.2.5. Disk recommendation for the Object Storage service
Use one or more separate, local disks for the Red Hat OpenStack Platform (RHOSP) Object Storage service (swift).
By default, RHOSP director uses the directory /srv/node/d1
on the system disk for the Object Storage service. On the Controller, this disk is also used by other services, and the disk can become a performance bottleneck.
The following example is an excerpt from a RHOSP Orchestration service (heat) custom environment file. On each Controller node, the Object Storage service uses two separate disks. The entirety of both disks contains an XFS file system:
parameter_defaults: SwiftRawDisks: {"sdb": {}, "sdc": {}}
SwiftRawDisks
defines each storage disk on the node. This example defines both sdb
and sdc
disks on each Controller node.
When configuring multiple disks, ensure that the Bare Metal service (ironic) uses the intended root disk.
Additional resources
- Defining the root disk for multi-disk clusters in the Director Installation and Usage guide.
5.3. Adding or removing Object Storage nodes
To add new Object Storage (swift) nodes to your cluster, you must increase the node count, update the rings, and synchronize the changes. You can increase the node count by adding nodes to the overcloud or by scaling up bare-metal nodes.
To remove Object Storage nodes from your cluster, you can perform a simple removal or an incremental removal, depending on the quantities of data in the cluster.
5.3.1. Adding nodes to the overcloud
You can add more nodes to your overcloud.
A fresh installation of Red Hat OpenStack Platform does not include certain updates, such as security errata and bug fixes. As a result, if you are scaling up a connected environment that uses the Red Hat Customer Portal or Red Hat Satellite Server, RPM updates are not applied to new nodes. To apply the latest updates to the overcloud nodes, you must do one of the following:
- Complete an overcloud update of the nodes after the scale-out operation.
-
Use the
virt-customize
tool to modify the packages to the base overcloud image before the scale-out operation. For more information, see the Red Hat Knowledgebase solution Modifying the Red Hat Linux OpenStack Platform Overcloud Image with virt-customize.
Procedure
Create a new JSON file called
newnodes.json
that contains details of the new node that you want to register:{ "nodes":[ { "mac":[ "dd:dd:dd:dd:dd:dd" ], "cpu":"4", "memory":"6144", "disk":"40", "arch":"x86_64", "pm_type":"ipmi", "pm_user":"admin", "pm_password":"p@55w0rd!", "pm_addr":"192.168.24.207" }, { "mac":[ "ee:ee:ee:ee:ee:ee" ], "cpu":"4", "memory":"6144", "disk":"40", "arch":"x86_64", "pm_type":"ipmi", "pm_user":"admin", "pm_password":"p@55w0rd!", "pm_addr":"192.168.24.208" } ] }
Register the new nodes:
$ source ~/stackrc (undercloud)$ openstack overcloud node import newnodes.json
Launch the introspection process for each new node:
(undercloud)$ openstack overcloud node introspect \ --provide <node_1> [node_2] [node_n]
-
Use the
--provide
option to reset all the specified nodes to anavailable
state after introspection. -
Replace
<node_1>
,[node_2]
, and all nodes up to[node_n]
with the UUID of each node that you want to introspect.
-
Use the
Configure the image properties for each new node:
(undercloud)$ openstack overcloud node configure <node>
5.3.2. Scaling up bare-metal nodes
To increase the count of bare-metal nodes in an existing overcloud, increment the node count in the overcloud-baremetal-deploy.yaml
file and redeploy the overcloud.
Prerequisites
- The new bare-metal nodes are registered, introspected, and available for provisioning and deployment. For more information, see Registering nodes for the overcloud and Creating an inventory of the bare-metal node hardware.
Procedure
Source the
stackrc
undercloud credential file:$ source ~/stackrc
-
Open the
overcloud-baremetal-deploy.yaml
node definition file that you use to provision your bare-metal nodes. Increment the
count
parameter for the roles that you want to scale up. For example, the following configuration increases the Object Storage node count to 4:- name: Controller count: 3 - name: Compute count: 10 - name: ObjectStorage count: 4
Optional: Configure predictive node placement for the new nodes. For example, use the following configuration to provision a new Object Storage node on
node03
:- name: ObjectStorage count: 4 instances: - hostname: overcloud-objectstorage-0 name: node00 - hostname: overcloud-objectstorage-1 name: node01 - hostname: overcloud-objectstorage-2 name: node02 - hostname: overcloud-objectstorage-3 name: node03
- Optional: Define any other attributes that you want to assign to your new nodes. For more information about the properties you can use to configure node attributes in your node definition file, see Bare-metal node provisioning attributes.
-
If you use the Object Storage service (swift) and the whole disk overcloud image,
overcloud-hardened-uefi-full
, configure the size of the/srv
partition based on the size of your disk and your storage requirements for/var
and/srv
. For more information, see Configuring whole disk partitions for the Object Storage service. Provision the overcloud nodes:
(undercloud)$ openstack overcloud node provision \ --stack <stack> \ --output <deployment_file> \ /home/stack/templates/overcloud-baremetal-deploy.yaml
-
Replace
<stack>
with the name of the stack for which the bare-metal nodes are provisioned. If not specified, the default isovercloud
. -
Replace
<deployment_file>
with the name of the heat environment file to generate for inclusion in the deployment command, for example/home/stack/templates/overcloud-baremetal-deployed.yaml
.
-
Replace
Monitor the provisioning progress in a separate terminal. When provisioning is successful, the node state changes from
available
toactive
:(undercloud)$ watch openstack baremetal node list
Add the generated
overcloud-baremetal-deployed.yaml
file to the stack with your other environment files and deploy the overcloud:(undercloud)$ openstack overcloud deploy --templates \ -e [your environment files] \ -e /home/stack/templates/overcloud-baremetal-deployed.yaml \ --deployed-server \ --disable-validations \ ...
5.3.3. Defining dedicated Object Storage nodes
Dedicate additional nodes to the Red Hat OpenStack Platform (RHOSP) Object Storage service to improve performance.
If you are dedicating additional nodes to the Object Storage service, edit the custom roles_data.yaml
file to remove the Object Storage service entry from the Controller node. Specifically, remove the following line from the ServicesDefault
list of the Controller
role:
- OS::TripleO::Services::SwiftStorage
5.3.4. Updating and rebalancing the Object Storage rings
The Object Storage service (swift) requires the same ring files on all Controller and Object Storage nodes. If a Controller node or Object Storage node is replaced, added or removed, these must be synced after an overcloud update to ensure proper functionality.
Procedure
Log in to the undercloud as the
stack
user and create a temporary directory:$ mkdir temp && cd temp/
Download the overcloud ring files from one of the previously existing nodes (Controller 0 in this example) to the new directory:
$ ssh tripleo-admin@overcloud-controller-0.ctlplane 'sudo tar -czvf - /var/lib/config-data/puppet-generated/swift_ringbuilder/etc/swift/{*.builder,*.ring.gz,backups/*.builder}' > swift-rings.tar.gz
Extract the rings and change into the ring subdirectory:
$ tar xzvf swift-rings.tar.gz && cd var/lib/config-data/puppet-generated/swift_ringbuilder/etc/swift/
Collect the values for the following variables according to your device details:
<device_name>
:$ openstack baremetal introspection data save <node_name> | jq ".inventory.disks"
<node_ip>
:$ metalsmith <node_name> show
-
<port>
: The default port is600x
. If you altered the default, use the applicable port. -
<builder_file>
: The builder file name from step 3. -
<weight>
and<zone>
variables are user-defined.
Use
swift-ring-builder
to add and update the new node to the existing rings. Replace the variables according to the device details.NoteYou must install the
python3-swift
RPM to use theswift-ring-builder
command.$ swift-ring-builder etc/swift/<builder_file> add <zone>-<node_ip>:<port>/<device_name> <weight>
Rebalance the ring to ensure that the new device is used:
$ swift-ring-builder etc/swift/<builder_file> rebalance
Upload the modified ring files to the Controller nodes and ensure that these ring files are used. Use a script, similar to the following example, to distribute ring files:
#!/bin/sh set -xe ALL="tripleo-admin@overcloud-controller-0.ctlplane tripleo-admin@overcloud-controller-1.ctlplane tripleo-admin@overcloud-controller-2.ctlplane"
Upload the rings to all nodes and restart Object Storage services:
for DST in ${ALL}; do cat swift-rings.tar.gz | ssh "${DST}" 'sudo tar -C / -xvzf -' ssh "${DST}" 'sudo podman restart swift_copy_rings' ssh "${DST}" 'sudo systemctl restart tripleo_swift*' done
5.3.5. Syncing node changes and migrating data
You must deliver the changed ring files to the Object Storage (swift) containers after you copy new ring files to their correct folders.
- Important
- Do not migrate all of the data at the same time. Migrate the data in 10% increments. For example, configure the weight of the source device to equal 90.0 and the target device to equal 10.0. Then configure the weight of the source device to equal 80.0 and 20.0. Continue to incrementally migrate the data until you complete the process. During the migration, if you move all of the data at the same time, the old data is on the source device but the ring points to the new target device for all replicas. Until the replicators have moved all of the data to the target device, the data is inaccessible.
During migration, the Object Storage rings reassign the location of data, and then the replicator moves the data to the new location. As cluster activity increases, the process of replication slows down due to increased load. The larger the cluster, the longer a replication pass takes to complete. This is the expected behavior, but it can result in 404 errors in the log files if a client accesses the data that is currently being relocated. When a proxy attempts to retrieve data from a new location, but the data is not yet in the new location,
swift-proxy
reports a 404 error in the log files.When the migration is gradual, the proxy accesses replicas that are not being moved and no error occurs. When the proxy attempts to retrieve the data from an alternative replica, 404 errors in log files are resolved. To confirm that the replication process is progressing, refer to the replication logs. The Object Storage service (swift) issues replication logs every five minutes.
Procedure
Use a script, similar to the following example, to distribute ring files from a previously existing Controller node to all Controller nodes and restart the Object Storage service containers on those nodes:
#!/bin/sh set -xe SRC="tripleo-admin@overcloud-controller-0.ctlplane" ALL="tripleo-admin@overcloud-controller-0.ctlplane tripleo-admin@overcloud-controller-1.ctlplane tripleo-admin@overcloud-controller-2.ctlplane"
Fetch the current set of ring files:
ssh "${SRC}" 'sudo tar -czvf - /var/lib/config-data/puppet-generated/swift_ringbuilder/etc/swift/{*.builder,*.ring.gz,backups/*.builder}' > swift-rings.tar.gz
Upload the rings to all nodes and restart Object Storage services:
for DST in ${ALL}; do cat swift-rings.tar.gz | ssh "${DST}" 'sudo tar -C / -xvzf -' ssh "${DST}" 'sudo podman restart swift_copy_rings' ssh "${DST}" 'sudo systemctl restart tripleo_swift*' done
To confirm that the data is being moved to the new disk, run the following command on the new storage node:
$ sudo grep -i replication /var/log/container/swift/swift.log
5.3.6. Removing Object Storage nodes
There are two methods to remove an Object Storage (swift) node:
- Simple removal: This method removes the node in one action and is appropriate for an efficiently-powered cluster with smaller quantities of data.
- Incremental removal: Alter the rings to decrease the weight of the disks on the node that you want to remove. This method is appropriate if you want to minimize impact on storage network usage or if your cluster contains larger quantities of data.
For both methods, you follow the Scaling down bare-metal nodes procedure. However, for incremental removal, complete these prerequisites to alter the storage rings to decrease the weight of the disks on the node that you want to remove:
Prerequisites
- Object Storage rings are updated and rebalanced. For more information, see Updating and rebalancing the Object Storage rings.
- Changes in the Object Storage rings are synchronized. For more information, see Syncing node changes and migrating data.
For information about replacing an Object Storage node, see the prerequisites at the beginning of the Scaling down bare-metal nodes procedure .
5.3.7. Scaling down bare-metal nodes
To scale down the number of bare-metal nodes in your overcloud, tag the nodes that you want to delete from the stack in the node definition file, redeploy the overcloud, and then delete the bare-metal node from the overcloud.
Prerequisites
- A successful undercloud installation. For more information, see Installing director on the undercloud.
- A successful overcloud deployment. For more information, see Configuring a basic overcloud with pre-provisioned nodes.
If you are replacing an Object Storage node, replicate data from the node you are removing to the new replacement node. Wait for a replication pass to finish on the new node. Check the replication pass progress in the
/var/log/swift/swift.log
file. When the pass finishes, the Object Storage service (swift) adds entries to the log similar to the following example:Mar 29 08:49:05 localhost object-server: Object replication complete. Mar 29 08:49:11 localhost container-server: Replication run OVER Mar 29 08:49:13 localhost account-server: Replication run OVER
Procedure
Source the
stackrc
undercloud credential file:$ source ~/stackrc
-
Decrement the
count
parameter in theovercloud-baremetal-deploy.yaml
file, for the roles that you want to scale down. -
Define the
hostname
andname
of each node that you want to remove from the stack, if they are not already defined in theinstances
attribute for the role. Add the attribute
provisioned: false
to the node that you want to remove. For example, to remove the nodeovercloud-objectstorage-1
from the stack, include the following snippet in yourovercloud-baremetal-deploy.yaml
file:- name: ObjectStorage count: 3 instances: - hostname: overcloud-objectstorage-0 name: node00 - hostname: overcloud-objectstorage-1 name: node01 # Removed from cluster due to disk failure provisioned: false - hostname: overcloud-objectstorage-2 name: node02 - hostname: overcloud-objectstorage-3 name: node03
After you redeploy the overcloud, the nodes that you define with the
provisioned: false
attribute are no longer present in the stack. However, these nodes are still running in a provisioned state.NoteTo remove a node from the stack temporarily, deploy the overcloud with the attribute
provisioned: false
and then redeploy the overcloud with the attributeprovisioned: true
to return the node to the stack.Delete the node from the overcloud:
(undercloud)$ openstack overcloud node delete \ --stack <stack> \ --baremetal-deployment /home/stack/templates/overcloud-baremetal-deploy.yaml
Replace
<stack>
with the name of the stack for which the bare-metal nodes are provisioned. If not specified, the default isovercloud
.NoteDo not include the nodes that you want to remove from the stack as command arguments in the
openstack overcloud node delete
command.
Provision the overcloud nodes to generate an updated heat environment file for inclusion in the deployment command:
(undercloud)$ openstack overcloud node provision \ --stack <stack> \ --output <deployment_file> \ /home/stack/templates/overcloud-baremetal-deploy.yaml
-
Replace
<deployment_file>
with the name of the heat environment file to generate for inclusion in the deployment command, for example/home/stack/templates/overcloud-baremetal-deployed.yaml
.
-
Replace
Add the
overcloud-baremetal-deployed.yaml
file generated by the provisioning command to the stack with your other environment files, and deploy the overcloud:(undercloud)$ openstack overcloud deploy \ ... -e /usr/share/openstack-tripleo-heat-templates/environments/deployed-server-environment.yaml \ -e /home/stack/templates/overcloud-baremetal-deployed.yaml \ --deployed-server \ --disable-validations \ ...
5.4. Container management in the Object Storage service
To help with organization in the Object Storage service (swift), you can use pseudo folders. These folders are logical devices that can contain objects and be nested. For example, you might create an Images folder in which to store pictures and a Media folder in which to store videos.
You can create one or more containers in each project, and one or more objects or pseudo folders in each container.
5.4.1. Creating private and public containers
Use the dashboard to create a container in the Object Storage service (swift).
Procedure
- In the dashboard, select Project > Object Store > Containers.
- Click Create Container.
Specify the Container Name, and select one of the following in the Container Access field.
Type Description Private
Limits access to a user in the current project.
Public
Permits API access to anyone with the public URL. However, in the dashboard, project users cannot see public containers and data from other projects.
- Click Create Container.
Optional: New containers use the default storage policy. If you have multiple storage policies defined, for example, a default policy and another policy that enables erasure coding, you can configure a container to use a non-default storage policy:
$ swift post -H "X-Storage-Policy:<policy>" <container_name>
-
Replace
<policy>
with the name or alias of the policy that you want the container to use. -
Replace
<container_name>
with the name of the container.
-
Replace
5.4.2. Creating pseudo folders for containers
Use the dashboard to create a pseudo folder for a container in the Object Storage service (swift).
Procedure
- In the dashboard, select Project > Object Store > Containers.
- Click the name of the container to which you want to add the pseudo folder.
- Click Create Pseudo-folder.
- Specify the name in the Pseudo-folder Name field, and click Create.
5.4.3. Deleting containers from the Object Storage service
Use the dashboard to delete a container from the Object Storage service (swift).
Procedure
- In the dashboard, select Project > Object Store > Containers.
- Browse for the container in the Containers section, and ensure that all objects are deleted. For more information, see Deleting objects from the Object Storage service.
- Select Delete Container in the container arrow menu.
- Click Delete Container to confirm the container removal.
5.4.4. Uploading objects to containers
If you do not upload an actual file to the Object Storage service (swift), the object is still created as a placeholder that you can use later to upload the file.
Procedure
- In the dashboard, select Project > Object Store > Containers.
- Click the name of the container in which you want to place the uploaded object. If a pseudo folder already exists in the container, you can click its name.
- Browse for your file, and click Upload Object.
Specify a name in the Object Name field:
- You can specify pseudo folders in the name by using a / character,for example, Images/myImage.jpg. If the specified folder does not already exist, it is created when the object is uploaded.
- A name that is not unique to the location, that is, the object already exists, overwrites the contents of the object.
- Click Upload Object.
5.4.5. Copying objects between containers
Use the dashboard to copy an object in the Object Storage service (swift).
Procedure
- In the dashboard, select Project > Object Store > Containers.
- Click the name of the object’s container or folder (to display the object).
- Click Upload Object.
- Browse for the file to be copied, and select Copy in its arrow menu.
Specify the following:
Field Description Destination container
Target container for the new object.
Path
Pseudo-folder in the destination container; if the folder does not already exist, it is created.
Destination object name
New object’s name. If you use a name that is not unique to the location (that is, the object already exists), it overwrites the object’s previous contents.
- Click Copy Object.
5.4.6. Deleting objects from the Object Storage service
Use the dashboard to delete an object from the Object Storage service (swift).
Procedure
- In the dashboard, select Project > Object Store > Containers.
- Browse for the object, and select Delete Object in its arrow menu.
- Click Delete Object to confirm the object is removed.