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Chapter 12. Management of iSCSI gateway using the Ceph Orchestrator (Limited Availability)

As a storage administrator, you can use Ceph Orchestrator to deploy the iSCSI gateway. The iSCSI Gateway presents a Highly Available (HA) iSCSI target that exports RADOS Block Device (RBD) images as SCSI disks.

You can deploy an iSCSI gateway by either using the placement specification or the service specification, like an YAML file.

Note

This technology is Limited Availability. See the Deprecated functionality chapter for additional information.

This section covers the following administrative tasks:

12.1. Prerequisites
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  • A running Red Hat Ceph Storage cluster.
  • Root-level access to all the nodes.
  • Hosts are added to the cluster.
  • All manager, monitor and OSD daemons are deployed.

12.2. Deploying the iSCSI gateway using the command line interface
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Using the Ceph Orchestrator, you can deploy the iSCSI gateway using the ceph orch command in the command line interface.

Prerequisites

  • A running Red Hat Ceph Storage cluster.
  • Hosts are added to the cluster.
  • All manager, monitor and OSD daemons are deployed.

Procedure

  1. Log into the Cephadm shell:

    Example

    [root@host01 ~]# cephadm shell
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  2. Create the pool:

    Syntax

    ceph osd pool create POOL_NAME
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    Example

    [ceph: root@host01 /]# ceph osd pool create mypool
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  3. Deploy iSCSI gateway using command line interface:

    Syntax

    ceph orch apply iscsi POOLNAME admin admin --placement="NUMBER_OF_DAEMONS HOST_NAME_1 HOST_NAME_2"
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    Example

    [ceph: root@host01 /]# ceph orch apply iscsi mypool admin admin --placement="1 host01"
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Verification

  • List the service:

    Example

    [ceph: root@host01 /]# ceph orch ls
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  • List the hosts and process:

    Syntax

    ceph orch ps --daemon_type=DAEMON_NAME
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    Example

    [ceph: root@host01 /]# ceph orch ps --daemon_type=iscsi
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12.3. Deploying the iSCSI gateway using the service specification
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Using the Ceph Orchestrator, you can deploy the iSCSI gateway using the service specification.

Prerequisites

  • A running Red Hat Ceph Storage cluster.
  • Hosts are added to the cluster.
  • All manager, monitor and OSD daemons are deployed.

Procedure

  1. Create the iscsi.yml file:

    Example

    [root@host01 ~]# touch iscsi.yml
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  2. Edit the iscsi.yml file to include the following details:

    Syntax

    service_type: iscsi
service_id: iscsi
placement:
  hosts:
    - HOST_NAME_1
    - HOST_NAME_2
spec:
  pool: POOL_NAME  # RADOS pool where ceph-iscsi config data is stored.
  trusted_ip_list: "IP_ADDRESS_1,IP_ADDRESS_2" # optional
  api_port: ... # optional
  api_user: API_USERNAME # optional
  api_password: API_PASSWORD # optional
  api_secure: true/false # optional
  ssl_cert: | # optional
  ...
  ssl_key: | # optional
  ...
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    Example

    service_type: iscsi
service_id: iscsi
placement:
  hosts:
    - host01
spec:
  pool: mypool
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  3. Mount the YAML file under a directory in the container:

    Example

    [root@host01 ~]# cephadm shell --mount iscsi.yaml:/var/lib/ceph/iscsi.yaml
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  4. Navigate to the following directory:

    Syntax

    cd /var/lib/ceph/DAEMON_PATH/
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    Example

    [ceph: root@host01 /]# cd /var/lib/ceph/
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  5. Deploy iSCSI gateway using service specification:

    Syntax

    ceph orch apply -i FILE_NAME.yml
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    Example

    [ceph: root@host01 iscsi]# ceph orch apply -i iscsi.yml
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Verification

  • List the service:

    Example

    [ceph: root@host01 /]# ceph orch ls
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  • List the hosts, daemons, and processes:

    Syntax

    ceph orch ps --daemon_type=DAEMON_NAME
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    Example

    [ceph: root@host01 /]# ceph orch ps --daemon_type=iscsi
    Copy to Clipboard Toggle word wrap

12.4. Removing the iSCSI gateway using the Ceph Orchestrator
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You can remove the iSCSI gateway daemons using the ceph orch rm command.

Prerequisites

  • A running Red Hat Ceph Storage cluster.
  • Root-level access to all the nodes.
  • Hosts are added to the cluster.
  • At least one iSCSI gateway daemon deployed on the hosts.

Procedure

  1. Log into the Cephadm shell:

    Example

    [root@host01 ~]# cephadm shell
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  2. List the service:

    Example

    [ceph: root@host01 /]# ceph orch ls
    Copy to Clipboard Toggle word wrap

    1. Remove the service

      Syntax

      ceph orch rm SERVICE_NAME
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      Example

      [ceph: root@host01 /]# ceph orch rm iscsi.iscsi
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Verification

  • List the hosts, daemons, and processes:

    Syntax

    ceph orch ps
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    Example

    [ceph: root@host01 /]# ceph orch ps
    Copy to Clipboard Toggle word wrap

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