This is a good start to play around with the galera multi-master mysql synchronous replication (http://www.codership.com/products/mysql_galera)

HOWTO:

 * play around (add a database and data, chaos-monkey nodes etc.)


WARNING

Change the mysql root password in production and limit access to galera cluster members!

TODO

 * naming: master -> donor
 * put a load balancer in front of the cluster
 * make cluster "masterless"

nodes.pp

# nodes
$cluster_name = 'wsrep_galera_cluster'

node /mysql-db-01/ {
    class { 'galera' :
        cluster_name => $cluster_name
    }
}

node /mysql-db-0([2-9])/ {
    $master_ip = '172.18.67.254'
    class { 'galera' :
        cluster_name => $cluster_name,
        master_ip    => $master_ip
    }
}