Database migration on kubernetes

Hi Community,

We test Kuberntes technology on GKE and in a first time, thanks very much for this great technology.

We wonder about best practice about database migrations strategy.
We have a Drupal docker image and a database managed by Google (not container).

With an operationnal view, when the kub service are open, update of framework may have upgrade database schema ( 8.00 -> 9.00 or 10.00 -> 11.00). We want to prefer a generic system native kubernetes.

My first google research guides me to :

In a next time, we want to deploy other services with the same strategy : Mediawiki, Wordpress, PHP

Do you have best pratice ? (sorry for my poor experience)

Thank you in advance for your answers,