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moby--moby/docs/reference/commandline/swarm_update.md
Gaetan de Villele 248c699ec8 fix frontmatter keywords value type (string, instead of []string) in /docs/reference 
Signed-off-by: Gaetan de Villele <gdevillele@gmail.com>
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swarm update The swarm update command description and usage swarm, update

swarm update

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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