Chapter 14. Rebooting Nodes

Procedure

1. Log into the undercloud as the stack user.

2. Reboot the undercloud:

   $ sudo reboot

   Copy to Clipboard Toggle word wrap
3. Wait until the node boots.

Procedure

1. Log in to the node that you want to reboot.

2. Optional: If the node uses Pacemaker resources, stop the cluster:

   [heat-admin@overcloud-controller-0 ~]$ sudo pcs cluster stop

   Copy to Clipboard Toggle word wrap

3. Reboot the node:

   [heat-admin@overcloud-controller-0 ~]$ sudo reboot

   Copy to Clipboard Toggle word wrap
4. Wait until the node boots.

5. Check the services. For example:

   1. If the node uses Pacemaker services, check that the node has rejoined the cluster:

      [heat-admin@overcloud-controller-0 ~]$ sudo pcs status

      Copy to Clipboard Toggle word wrap

   2. If the node uses Systemd services, check that all services are enabled:

      [heat-admin@overcloud-controller-0 ~]$ sudo systemctl status

      Copy to Clipboard Toggle word wrap
   3. Repeat these steps for all Controller and composable nodes.

Procedure

1. Log into a Ceph MON node.

2. Reboot the node:

   $ sudo reboot

   Copy to Clipboard Toggle word wrap
3. Wait until the node boots and rejoins the MON cluster.

Procedure

1. Log in to a Ceph MON or Controller node and disable Ceph Storage cluster rebalancing temporarily:

   $ sudo ceph osd set noout
   $ sudo ceph osd set norebalance

   Copy to Clipboard Toggle word wrap
2. Select the first Ceph Storage node to reboot and log into it.

3. Reboot the node:

   $ sudo reboot

   Copy to Clipboard Toggle word wrap
4. Wait until the node boots.

5. Log in to a Ceph MON or Controller node and check the cluster status:

   $ sudo ceph -s

   Copy to Clipboard Toggle word wrap

   Check that the pgmap reports all pgs as normal (active+clean).

6. Log out of the Ceph MON or Controller node, reboot the next Ceph Storage node, and check its status. Repeat this process until you have rebooted all Ceph storage nodes.

7. When complete, log into a Ceph MON or Controller node and enable cluster rebalancing again:

   $ sudo ceph osd unset noout
   $ sudo ceph osd unset norebalance

   Copy to Clipboard Toggle word wrap

8. Perform a final status check to verify the cluster reports HEALTH_OK:

   $ sudo ceph status

   Copy to Clipboard Toggle word wrap

Procedure

1. Log in to an Object Storage node.

2. Reboot the node:

   $ sudo reboot

   Copy to Clipboard Toggle word wrap
3. Wait until the node boots.
4. Repeat the reboot for each Object Storage node in the cluster.

Procedure

1. Log in to the undercloud as the stack user.

2. To identify the Compute node that you intend to reboot, list all Compute nodes:

   $ source ~/stackrc
   (undercloud) $ openstack server list --name compute

   Copy to Clipboard Toggle word wrap

3. From the overcloud, select a Compute Node and disable it:

   $ source ~/overcloudrc
   (overcloud) $ openstack compute service list
   (overcloud) $ openstack compute service set <hostname> nova-compute --disable

   Copy to Clipboard Toggle word wrap

4. List all instances on the Compute node:

   (overcloud) $ openstack server list --host <hostname> --all-projects

   Copy to Clipboard Toggle word wrap
5. Migrate your instances. For more information on migration strategies, see Migrating virtual machines between Compute nodes.

6. Log into the Compute Node and reboot it:

   [heat-admin@overcloud-compute-0 ~]$ sudo reboot

   Copy to Clipboard Toggle word wrap
7. Wait until the node boots.

8. Enable the Compute node:

   $ source ~/overcloudrc
   (overcloud) $ openstack compute service set <hostname> nova-compute --enable

   Copy to Clipboard Toggle word wrap

9. Verify that the Compute node is enabled:

   (overcloud) $ openstack compute service list

   Copy to Clipboard Toggle word wrap