What is the minimum of etcd members that are required for a highly available Kubernetes cluster?

The correct answer is D. Three etcd members. Three etcd members (D) is the minimum for a highly available cluster. etcd uses the Raft consensus algorithm, which requires a quorum of (n/2)+1 nodes to agree before committing a write. With 3 members, quorum is 2, so the cluster can tolerate 1 member failure and remain…

Submitted by ngozi_ng· May 4, 2026Kubernetes Fundamentals

Question

Options

ATwo etcd members.
BFive etcd members.
CSix etcd members.
DThree etcd members

How the community answered

(63 responses)

A
2% (1)
B
8% (5)
C
3% (2)
D
87% (55)

Explanation

Three etcd members (D) is the minimum for a highly available cluster. etcd uses the Raft consensus algorithm, which requires a quorum of (n/2)+1 nodes to agree before committing a write. With 3 members, quorum is 2, so the cluster can tolerate 1 member failure and remain operational. Two members provide no fault tolerance - losing one node means losing quorum. Five or six members provide more redundancy but are not the minimum.

Topics

#etcd#High Availability#Kubernetes Architecture#Control Plane

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