The mysql cartridge provides MySQL on OpenShift.
The mysql cartridge provides several environment variables to reference for ease
of use:
OPENSHIFT_MYSQLDB_DB_HOST The MySQL IP address
OPENSHIFT_MYSQLDB_DB_PORT The MySQL port
OPENSHIFT_MYSQLDB_DB_LOG_DIR The path to the MySQL log directory
For more information about environment variables, consult the OpenShift Application Author Guide.