K
Q

What is the difference between Master Node and Control Plane on Kubernetes?

8/20/2021

What is the difference between Master Node and Control Plane?

Is the same or is there any difference?

-- alex
kubernetes

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3 Answers

8/20/2021

Control Plane hosts important components like api-server,etcd,kube-scheduler and kube-controller in your kubernetes cluster. As said, it is same as Master Node just a terminology change pretty lately.

-- Chandra Sekar
Source: StackOverflow
8/20/2021

Same thing, we switched to the "control plane" terminology about a year ago as it is more accurate and doesn't have problematic cultural undertones.

-- coderanger
Source: StackOverflow
8/20/2021

Have a look at https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.20.md#urgent-upgrade-notes . This should answer your Question:

  • The label applied to control-plane nodes "node-role.kubernetes.io/master" is now deprecated and will be removed in a future release after a GA deprecation period.
  • Introduce a new label "node-role.kubernetes.io/control-plane" that will be applied in parallel to "node-role.kubernetes.io/master" until the removal of the "node-role.kubernetes.io/master" label.

I think also important is this:

  • Make "kubeadm upgrade apply" add the "node-role.kubernetes.io/control-plane" label on existing nodes that only have the "node-role.kubernetes.io/master" label during upgrade.
  • Please adapt your tooling built on top of kubeadm to use the "node-role.kubernetes.io/control-plane" label.
  • The taint applied to control-plane nodes "node-role.kubernetes.io/master:NoSchedule" is now deprecated and will be removed in a future release after a GA deprecation period.
  • Apply toleration for a new, future taint "node-role.kubernetes.io/control-plane:NoSchedule" to the kubeadm CoreDNS / kube-dns managed manifests. Note that this taint is not yet applied to kubeadm control-plane nodes.
  • Please adapt your workloads to tolerate the same future taint preemptively.
-- weranders
Source: StackOverflow