Comments - mariadb 10 multi master galera cluster + streaming replication for backup
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Yeah, that's possible.
Set
log_slave_updates=ON
on the cluster node that you want to act as master. See Configuring MariaDB Galera Cluster: Writing Replicated Write Sets to the Binary Log and Using MariaDB Replication with MariaDB Galera Cluster: Configuring a Cluster Node as a Replication Master for more information on why this is important.Then follow the directions at Setting up a Replication Slave with Mariabackup which shows how to take a backup of the master node, rebuild the slave with that backup, and then set up replication.