The beta cluster wiki databases are hosted on deployment-db1 and deployment-db2. They are Ubuntu Precise hosts and as such come with version 5.5.34+maria-1~precise.
One will want to create a couple Jessie instances and conduct the database migrations to the new hosts.
Would let us do things like T139044 for https://gerrit.wikimedia.org/r/#/c/289985/
Rough plan mostly going under the responsibility / leadership of #releng
[X] find an owner inside #release-engineering-team
[X] create new Jessie instances with `role::mariadb::beta`
[ ] prepare puppet.git and mediawiki-config.git patches to change the IP addresses
[ ] figure out potential impacts
[ ] schedule a maintenance window with @jcrespo
[ ] stop database and pair with @jcrespo providing context / monitoring etc
[ ] resume service and verify