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Chapter 10. Storage Configuration

This chapter outlines several methods of configuring storage options for your Overcloud.

Important

The Overcloud uses local and LVM storage for the default storage options. However, these options are not supported for enterprise-level Overclouds. It is recommended to use one of the storage options in this chapter.

10.1. Configuring NFS Storage
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This section describes configuring the Overcloud to use an NFS share. The installation and configuration process is based on the modification of an existing environment file in the core Heat template collection.

The core heat template collection contains a set of environment files in /usr/share/openstack-tripleo-heat-templates/environments/. These environment templates help with custom configuration of some of the supported features in a director-created Overcloud. This includes an environment file to help configure storage. This file is located at /usr/share/openstack-tripleo-heat-templates/environments/storage-environment.yaml. Copy this file to the stack user’s template directory. 

$ cp /usr/share/openstack-tripleo-heat-templates/environments/storage-environment.yaml ~/templates/.
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The environment file contains some parameters to help configure different storage options for OpenStack’s block and image storage components, cinder and glance. In this example, you will configure the Overcloud to use an NFS share. Modify the following parameters:

CinderEnableIscsiBackend
Enables the iSCSI backend. Set to false.
CinderEnableRbdBackend
Enables the Ceph Storage backend. Set to false.
CinderEnableNfsBackend
Enables the NFS backend. Set to true.
NovaEnableRbdBackend
Enables Ceph Storage for Nova ephemeral storage. Set to false.
GlanceBackend
Define the back end to use for Glance. Set to file to use file-based storage for images. The Overcloud will save these files in a mounted NFS share for Glance.
CinderNfsMountOptions
The NFS mount options for the volume storage.
CinderNfsServers
The NFS share to mount for volume storage. For example, 192.168.122.1:/export/cinder.
GlanceNfsEnabled
Enables Pacemaker to manage the share for image storage. If disabled, the Overcloud stores images in the Controller node’s file system. Set to true.
GlanceNfsShare
The NFS share to mount for image storage. For example, 192.168.122.1:/export/glance.
GlanceNfsOptions
The NFS mount options for the image storage.

The environment file’s options should look similar to the following: 

parameter_defaults:
  CinderEnableIscsiBackend: false
  CinderEnableRbdBackend: false
  CinderEnableNfsBackend: true
  NovaEnableRbdBackend: false
  GlanceBackend: 'file'

  CinderNfsMountOptions: 'rw,sync'
  CinderNfsServers: '192.0.2.230:/cinder'

  GlanceNfsEnabled: true
  GlanceNfsShare: '192.0.2.230:/glance'
  GlanceNfsOptions: 'rw,sync,context=system_u:object_r:glance_var_lib_t:s0'
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Important

Include the context=system_u:object_r:glance_var_lib_t:s0 in the GlanceFilePcmkOptions parameter to allow glance access to the /var/lib directory. Without this SELinux content, glance will fail to write to the mount point.

These parameters are integrated as part of the heat template collection. Setting them as such creates two NFS mount points for cinder and glance to use.

Save this file for inclusion in the Overcloud creation.

10.2. Configuring Ceph Storage
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The director provides two main methods for integrating Red Hat Ceph Storage into an Overcloud.

Creating an Overcloud with its own Ceph Storage Cluster
The director has the ability to create a Ceph Storage Cluster during the creation on the Overcloud. The director creates a set of Ceph Storage nodes that use the Ceph OSD to store the data. In addition, the director install the Ceph Monitor service on the Overcloud’s Controller nodes. This means if an organization creates an Overcloud with three highly available controller nodes, the Ceph Monitor also becomes a highly available service.
Integrating a Existing Ceph Storage into an Overcloud
If you already have an existing Ceph Storage Cluster, you can integrate this during an Overcloud deployment. This means you manage and scale the cluster outside of the Overcloud configuration.

For more information about configuring Overcloud Ceph Storage, see the dedicated Red Hat Ceph Storage for the Overcloud guide for full instructions on both scenarios.

10.3. Configuring Third Party Storage
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The director include a couple of environment files to help configure third-party storage providers. This includes:

Dell EMC Storage Center

Deploys a single Dell EMC Storage Center back end for the Block Storage (cinder) service.

The environment file is located at /usr/share/openstack-tripleo-heat-templates/environments/cinder-dellsc-config.yaml.

See the Dell Storage Center Back End Guide for full configuration information.

Dell EMC PS Series

Deploys a single Dell EMC PS Series back end for the Block Storage (cinder) service.

The environment file is located at /usr/share/openstack-tripleo-heat-templates/environments/cinder-dellps-config.yaml.

See the Dell EMC PS Series Back End Guide for full configuration information.

NetApp Block Storage

Deploys a NetApp storage appliance as a back end for the Block Storage (cinder) service.

The environment file is located at /usr/share/openstack-tripleo-heat-templates/environments/cinder-netapp-config.yaml.

See the NetApp Block Storage Back End Guide for full configuration information.

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