From ArchWiki

Galera is a synchronous multi-master cluster for MySQL/InnoDB databases.

Note: Currently replication is supported only for InnoDB tables.


The two components Galera cluster comprised of are Galera plugin itself and a patched version of MySQL server which connect using wsrep API.

Install the galera package. Also you will need rsync and lsof packages for rsync method.

Start/Enable the mysqld.service daemon.


You need to configure the cluster.

On each node edit /etc/my.cnf.d/server.cnf and update the wsrep_cluster_address variable so it contains the list of all nodes in the cluster:


Change the variables wsrep_node_address and wsrep_node_name to the IP address/hostname and name (this does not need to be unique) for each node, e.g.:


The wsrep_cluster_name variable should contain the same name for all cluster nodes:


Also, set wsrep_sst_method to the desired state snapshot transfer method, the preferred one is rsync.


Make sure you also set the following options:


When you have finished with /etc/my.cnf.d/server.cnf, bootstrap the mysqld service on the first node (ONLY on the first node):

# galera_new_cluster

This will bootstrap the cluster. Use MySQL's command line tool to log in as root into your MySQL server:

$ mysql -p -u root

Check the status of the cluster:

mysql> SHOW STATUS LIKE 'wsrep_%';

This will show you wsrep-related status variables:

| wsrep_local_state          | 4                                    |
| wsrep_local_state_comment  | Synced                               |
| wsrep_cert_index_size      | 0                                    |
| wsrep_causal_reads         | 0                                    |
| wsrep_incoming_addresses   |                     |
| wsrep_cluster_conf_id      | 1                                    |
| wsrep_cluster_size         | 1                                    |
| wsrep_cluster_state_uuid   | 6cd96745-2ea8-11e3-bbc8-d666651b51ef |
| wsrep_cluster_status       | Primary                              |
| wsrep_connected            | ON                                   |
| wsrep_local_index          | 0                                    |
| wsrep_provider_name        | Galera                               |

If you use xtrabackup or mysqldump SST method, you will need to create a MySQL user for sst transfers.

Once you configured the first node, you should be able to start mysqld.service.

See also