CODEWITHSUNDEEP
kuberneteshigh-availability
Dylan
Dylan

Reputation: 2219

What happens to a Kubernetes cluster when 2 of the three masters in a replica set are offline?

I am trying to figure out the minimum number of kubernetes master nodes in a master replica set for kubernetes that will allow the entire cluster to behave as normal. Their official docs mention that you need a of three master nodes.

What happens when you lose 1 of the 3 master nodes? Can you lose two of the master nodes in a replica set and still have the cluster behave as normal?

Upvotes: 1

Views: 1957

Answers (1)

Vasilii Angapov
Vasilii Angapov

Reputation: 9022

Kubernetes API works as long as Etcd cluster works. Etcd cluster works when there is quorum, so at least 2 of 3 Etcd pods are alive. If only 1 of 3 Etcd pod is alive - cluster goes to read-only state when no new pods can be scheduled and no resource creates/updates/deletes are allowed.

Upvotes: 5

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