How pod replicas sync with each other - Kubernetes?

Question

I have a MySQL database pod with 3 replicas.
Now I'm making some changes in one pod(pod data,not pod configuration), say I'm adding a table.
How will the change reflect on the other replicas of the pod?

I'm using kubernetes v1.13 with 3 worker nodes.

Answer 1

PODs do not sync. Think of them as independend processes.

If you want a clustered MySQL installation, the Kubernetes docs describe how to do this by using a StatefulSet: https://kubernetes.io/docs/tasks/run-application/run-replicated-stateful-application/#deploy-mysql

In essence you have to configure master/slave instances of MySQL yourself.