5.2. Restoring the control plane
If an error occurs during a fast-forward upgrade, you can use the ISO images created using the 「Backing up the control plane」 procedure to restore the control plane nodes to their previously saved state. To restore the control plane, you must restore all control plane nodes to the previous state to ensure state consistency.
Red Hat supports backups of Red Hat OpenStack Platform with native SDNs, such as Open vSwitch (OVS) and the default Open Virtual Network (OVN). For information about third-party SDNs, refer to the third-party SDN documentation.
- Shutdown each control plane node. Ensure that the control plane nodes are shutdown completely before you proceed.
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Restore the control plane nodes by booting them with the ISO image that you created during the backup process. The ISO images are located under the
/ctl_plane_backupsdirectory of the backup node. When the Relax-and-Recover boot menu appears, select Recover <Control Plane Node> where <Control Plane Node> is the name of the control plane node.
The following message displays:
Welcome to Relax-and-Recover. Run "rear recover" to restore your system! RESCUE <Control Plane Node>:~ # rear recover
The image restore progresses quickly. When the restore completes, the console echoes the following message:
Finished recovering your system Exiting rear recover Running exit tasks
When the command line interface is available, the image is restored. Switch the node off.
RESCUE <Control Plane Node>:~ # poweroff
Set the boot sequence to the normal boot device. On boot up, the node resumes with its previous state.
To ensure that the services are running correctly, check the status of pacemaker. Log in to a controller as
rootuser and run the following command:# pcs status
- To view the status of the overcloud, use Tempest. For more information about Tempest, see Chapter 4 of the OpenStack Integration Test Suite Guide.
