[mkulke]

Kubernetes is integrated with a lot of IaaS providers to get you a block storage volume to persist your data on. Once you request a persistent volume in a container it will provision the volume, attach it to the node where the container is scheduled to. It is then mounted (formatted if empty) into the container. When the container is killed and restarted on another node the volume moves with the container to that node.

Now when you want clustering of things like mysql/mongo/elasticsearch/rabbitmq/etc it's a bit more complex, b/c they bring their own sharding/clustering concepts, which you have to implement on top of kubernetes. So you won't be able to simply scale mysql up via "kubectl scale rc --replicas=5", but you will have to implement a specific clustering solution, with five unique mysql-pods with their own volumes. For mysql there is "vitess" which is an attempt to build such an abstraction upon kubernetes.