Configuration

The inventory may define these hosts:

• observers: Set of hosts to observe the cluster (only the first is considering)

Management tool

The vm_manager project is an high-level interface of pacemaker and ceph to manage the VM like a resource. He is installed during the installation step and provides the vm-mgr command.

Sub-command

All sub-commands has -n, --name required option to specify which resource should be used.

• add_colocation: Adds a colocation constraints between resources

• clone: Creates a copy of the VM

• create: Generates a new resource from a VM

• create_snapshot: Creates a snapshot of a resource

• disable: Stops and removes the resource on the cluster

• enable: Adds and starts the resource on the cluster

• get_metadata: Gets a metadata of a resource

• list: Lists all resources

• list_metadata: Lists all keys of a resource

• list_snapshots: Lists all created snapshots

• purge: Deletes all snapshots of a resource

• remove: Removes the resource

• remove_snapshot: Removes a snapshot of a resource

• rollback: Rollbacks to a snapshot for a resource

• set_metadata: Sets a metadata of a resource

• start: Start a resource

• status: Gets the status of a resource

• stop: Stops a resource

Resources status

• Undefined:
• Disabled:
• Failed:
• Started:
• Starting:
• Stopping:
• Stopped:

Replace a dead node

1. The ansible/playbooks/replace_machine_remove_machine_from_cluster.yaml playbook can remove a node in the cluster. For this, the machine_to_remove should be set to the hostname to remove.
   The below command should be launch 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 hosts should be install with the ISO installer and a new IP address. Make the connections between hosts.
3. Restart the playbook to configure the cluster (more details here).