2016-10-14 18:30:36 -04:00
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---
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title: "swarm update"
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description: "The swarm update command description and usage"
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keywords: ["swarm, update"]
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---
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2016-06-13 22:57:19 -04:00
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# swarm update
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2016-07-07 14:43:18 -04:00
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```markdown
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Usage: docker swarm update [OPTIONS]
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2016-07-20 14:15:08 -04:00
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Update the swarm
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2016-07-07 14:43:18 -04:00
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Options:
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--cert-expiry duration Validity period for node certificates (default 2160h0m0s)
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--dispatcher-heartbeat duration Dispatcher heartbeat period (default 5s)
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--external-ca value Specifications of one or more certificate signing endpoints
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--help Print usage
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2016-07-24 05:13:06 -04:00
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--task-history-limit int Task history retention limit (default 5)
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2016-07-07 14:43:18 -04:00
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```
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2016-06-13 22:57:19 -04:00
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2016-07-25 19:24:32 -04:00
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Updates a swarm with new parameter values. This command must target a manager node.
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2016-06-13 22:57:19 -04:00
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```bash
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2016-08-05 19:51:07 -04:00
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$ docker swarm update --cert-expiry 720h
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2016-06-13 22:57:19 -04:00
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```
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## Related information
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* [swarm init](swarm_init.md)
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* [swarm join](swarm_join.md)
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* [swarm leave](swarm_leave.md)
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