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Swarm Manager High Availability (HA)

Swarm Manager High Availability (HA)

Let's learn about Swarm managers' native support for high availability (HA).

Swarm managers

Swarm clusters are highly available (HA), meaning one or more managers can fail, and the swarm will keep running.

Technically speaking, Swarm implements active/passive multi-manager HA. This means a swarm with three managers will have one active manager, and the other two will be passive. In a swarm, we call the active manager the leader and the passive manager's followers, and the leader is the only manager who can update the swarm configuration. If the leader fails, one of the followers will be elected as the new leader, and the swarm will keep running without any service interruption. If you send commands to a follower, it proxies them to the leader. ...

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