I understand the difference between Declarative and Imperative Management, well explained in this thread kubectl apply vs kubectl create? and in the official doc https://kubernetes.io/docs/tasks/manage-kubernetes-objects/declarative-config/
But my residual doubt is that even in the Declarative Management a (manual) command like
kubectl scale
although persists further
kubectl apply
commands still "won't survive" a cluster restart (since its configuration change is stored in the cluster store, like etcd), right? If so, shouldn't we make changes only to the
object configuration file
and redeploy through
kubectl apply
command? thanks
As far as I understand kubectl scale will change the ReplicaSet configuration object in etcd. So, it'll survive a restart.
However, you should store your configuration objects in a version control system (git). If you execute commands like kubectl scale, that won't update the copies stored in git. The next usage of those configuration files will override the values previously set.