mirror of https://github.com/docker/docs.git
37 lines
1.1 KiB
Markdown
37 lines
1.1 KiB
Markdown
---
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redirect_from:
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- /reference/commandline/swarm_update/
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description: The swarm update command description and usage
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keywords:
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- swarm, update
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title: docker swarm update
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---
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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.
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```markdown
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Usage: docker swarm update [OPTIONS]
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Update the swarm
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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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--task-history-limit int Task history retention limit (default 5)
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```
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Updates a swarm with new parameter values. This command must target a manager node.
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```bash
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$ docker swarm update --cert-expiry 720h
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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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