Node replacement

In case one of the nodes suffers a difficult to repair situation (lost motherboard for example, or lost disk with no RAID), it might become necessary to replace the server with a blank one.

From the cluster point of view, we will need to remove the old node and add the new one, for both corosync/pacemaker and ceph.

1. The ansible/playbooks/replace_machine_remove_machine_from_cluster.yaml playbook can remove a node from the cluster. For this, the machine_to_remove should be set to the hostname to remove.
   The below command should be launched in the ansible project.

   cqfd run ansible-playbook -i /path/to/inventory.yaml -e machine_to_remove=HOSTNAME playbooks/replace_machine_remove_machine_from_cluster.yaml

    

2. A new host should be installed with the ISO installer and the same hostname, ip address, etc... than the old node.

3. Make the "cluster network" connections between hosts.

4. Restart the seapath_setup_main.yaml playbook to configure the new host in the cluster..

Open

Node disable

If a maintenance is needed on a specific node of the cluster, the deployed resources needs to be migrated to avoid any downtime.

To do so, the concerned node can be temporary disable from the cluster using:

Once the node is disabled, all the deployed resources are migrated to another cluster node, if applicable.

Node update

If a node of the cluster needs to be updated, you can use the following Ansible playbooks:

• On SEAPATH Yocto:

Note: You will need to generate first a SWU update file, and provide it in the swu_images directory of your Ansible working directory.

• On SEAPATH Debian: