Chapter 4. Verify external Ceph Storage cluster integration

Procedure

1. Create an image with the Image service (glance).

   For more information about how to create an image, see Import an image in the Creating and Managing Images guide.

2. Record the glance image ID for later use.

3. Create a Compute (nova) instance.

   For more information about how to create an instance, see Launch an instance in the Creating and Managing Instances guide.

4. Record the nova instance ID for later use.

5. Create a Block Storage (cinder) volume.

   For more information about how to create a Block Storage volume, see Create a volume in the Storage Guide.

6. Record the cinder volume ID for later use.

Procedure

1. Source the undercloud credentials:

   [stack@undercloud-0 ~]$ source stackrc

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2. List the available servers to retrieve the IP addresses of nodes on the system:

   (undercloud) [stack@undercloud-0 ~]$ openstack server list
   
   +---------------+----------------+---------------+
   | ID | Name | Status | Networks | Image | Flavor |
   +---------------+----------------+---------------+
   | d5a621bd-d109-41ae-a381-a42414397802 | compute-0 | ACTIVE | ctlplane=192.168.24.31 | overcloud-full | compute |
   | 496ab196-d6cb-447d-a118-5bafc5166cf2 | controller-0 | ACTIVE | ctlplane=192.168.24.37 | overcloud-full | controller |
   | c01e730d-62f2-426a-a964-b31448f250b3 | controller-2 | ACTIVE | ctlplane=192.168.24.55 | overcloud-full | controller |
   | 36df59b3-66f3-452e-9aec-b7e7f7c54b86 | controller-1 | ACTIVE | ctlplane=192.168.24.39 | overcloud-full | controller |
   | f8f00497-246d-4e40-8a6a-b5a60fa66483 | compute-1 | ACTIVE | ctlplane=192.168.24.10 | overcloud-full | compute |

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3. Use SSH to log in to any Compute node:

   (undercloud) [stack@undercloud-0 ~]$ ssh heat-admin@192.168.24.31

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4. Switch to the root user:

   [heat-admin@compute-0 ~]$ sudo su -

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5. Confirm that the files /etc/ceph/ceph.conf and /etc/ceph/ceph.client.openstack.keyring exist:

   [root@compute-0 ~]# ls -l /etc/ceph/ceph.conf
   
   -rw-r--r--. 1 root root 1170 Sep 29 23:25 /etc/ceph/ceph.conf
   [root@compute-0 ~]# ls -l /etc/ceph/ceph.client.openstack.keyring
   
   -rw-------. 1 ceph ceph 253 Sep 29 23:25 /etc/ceph/ceph.client.openstack.keyring

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6. Enter the following command to force the nova_compute container to use the rbd command to list the contents of the appropriate pool.

   # podman exec nova_compute /usr/bin/rbd --conf /etc/ceph/ceph.conf --keyring /etc/ceph/ceph.client.openstack.keyring --cluster ceph --id openstack ls vms

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   The pool name must match the pool names of the images, VMs, and volumes that you created when you configured the Ceph Storage cluster. For more information, see Configuring the existing Ceph Storage cluster. The IDs of the image, Compute instance, and volume must match the IDs that you recorded in Section 4.1, “Gathering IDs”.

   Note

   The example command is prefixed with podman exec nova_compute because /usr/bin/rbd, which is provided by the ceph-common package, is not installed on overcloud nodes by default. However, it is available in the nova_compute container. The command lists block device images. For more information, see Listing the block device images in the Ceph Storage Block Device Guide.

   The following examples show how to confirm whether an ID for each service is present for each pool by using the IDs from Section 4.1, “Gathering IDs”.

   # podman exec nova_compute /usr/bin/rbd --conf /etc/ceph/ceph.conf --keyring /etc/ceph/ceph.client.openstack.keyring --cluster ceph --id openstack ls images | grep 4485d4c0-24c3-42ec-a158-4d3950fa020b
   
   # podman exec nova_compute /usr/bin/rbd --conf /etc/ceph/ceph.conf --keyring /etc/ceph/ceph.client.openstack.keyring --cluster ceph --id openstack ls vms | grep 64bcb731-e7a4-4dd5-a807-ee26c669482f
   
   # podman exec nova_compute /usr/bin/rbd --conf /etc/ceph/ceph.conf --keyring /etc/ceph/ceph.client.openstack.keyring --cluster ceph --id openstack ls volumes | grep aeac15e8-b67f-454f-9486-46b3d75daff4

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Procedure

1. To shorten the amount of typing you must do in this procedure, log in to a Compute node and create an alias for the rbd command:

   # alias rbd="podman exec nova_compute /usr/bin/rbd --conf /etc/ceph/ceph.conf --keyring /etc/ceph/ceph.client.openstack.keyring --cluster ceph --id openstack"

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2. Confirm that you can write test data to the pool as a new object:

   # rbd create --size 1024 vms/foo

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3. Confirm that you can see the test data:

   # rbd ls vms | grep foo

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4. Delete the test data:

   # rbd rm vms/foo

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