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docs/engine/reference/commandline/swarm_update.md

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The swarm update command description and usage
swarm, update
docker swarm update

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

Usage:  docker swarm update [OPTIONS]

Update the swarm

Options:
      --cert-expiry duration            Validity period for node certificates (default 2160h0m0s)
      --dispatcher-heartbeat duration   Dispatcher heartbeat period (default 5s)
      --external-ca value               Specifications of one or more certificate signing endpoints
      --help                            Print usage
      --task-history-limit int          Task history retention limit (default 5)

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

$ docker swarm update --cert-expiry 720h

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