cli/docs/reference/commandline/swarm_update.md

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Warning: this command is part of the Swarm management feature introduced in Docker 1.12, and might be subject to non backward-compatible changes.

swarm update

Usage:  docker swarm update [OPTIONS]

update the Swarm.

Options:
      --auto-accept value               Auto acceptance policy (worker, manager or none)
      --dispatcher-heartbeat duration   Dispatcher heartbeat period (default 5s)
      --help                            Print usage
      --secret string                   Set secret value needed to accept nodes into cluster
      --task-history-limit int          Task history retention limit (default 10)
      --cert-expiry duration            Validity period for node certificates (default 2160h0m0s)

Updates a Swarm cluster with new parameter values. This command must target a manager node.

$ docker swarm update --auto-accept manager