tripleo-image-elements/elements/mysql/README.md

Installs Percona Xtradb Cluster which is a MySQL HA solution

Mysql and mariadb elements are very similar so both depend on mysql-common element which contains shared logic. See mysql-common for more details about mysql setup.

Please use the mariadb-rpm on Fedora based systems.

The Percona packages are in trusty apt repository and so trusty is a minimal requirement for this. You could use the apt-sources element to add the percona apt mirror to your image.

Heat

A list of IP addresses for nodes in the cluster, the host's IP adddress, and a cluster name must be defined in the heat metadata:

Metadata:
  mysql:
    cluster-name: 'my_cluster'
    host: 192.0.2.3
    nodes: 192.0.2.3,192.0.2.4