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Galera is a synchronous multi-master cluster for MySQL/InnoDB databases. For more information about the product and its features, please visit the official webpage.

Note: Currenty replication is supported only for InnoDB tables.


Install the mysql-wsrep and galera packages from the AUR.

Enable at startup

To enable mysql daemon to start at boot, add the mysqld service to systemd:

# systemctl enable mysqld.service


Once you have installed the galera and mysql-wsrep packages, you need to configure the cluster.

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


Also, change wsrep_node_address and wsrep_node_name variables to the IP address/hostname and name(this doesn't 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 the wsrep_sst_method variable to the desired state snapshot transfer method, the default one is rsync.


When you have finished with my.cnf file, start the mysqld service on the first node:

# systemctl start mysqld-bootstrap.service

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 all other nodes with:

# systemctl start mysqld.service



See also

Galera Wiki

Percona XtraDB Cluster’s documentation