versions

api compatilble and supported with upto 3 minor versions
specific versions of external tools used by k8s(etcd etc.) might required
other core services used by k8s shouldn't be one version higher than [[kube api server]]
- [[controller manager]] and [[scheduler|kube scheduler]] can be one version lower
- [[kubelet]] and [[kube proxy]] can be two versions lower
- [[kubectl]] can be one version lower or higher

command