This section instructs you on how to restart the whole Galera cluster. You may need to restart the whole cluster if all three Galera nodes fail to start.
Before you restart the Galera cluster, create a data backup using the Xtrabackup service as described in Create an instant backup of a MySQL database.
Caution
We recommend that you always back up your MySQL database before performing any changes to the Galera cluster, even if you do not plan to restore the backup data afterwards.
To restart the Galera cluster, use Restore a Galera cluster manually.