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moby--moby/docs/reference/commandline/swarm_update.md
Misty Stanley-Jones 52df69f00d Standardized formatting of CLI reference commands
Command name should be a H1

Only Description, Examples, and Related Commands should be H2

Changed 'Related information' heading to 'Related commands' since 99% it is only linking commands

Added some examples where relevant

Signed-off-by: Misty Stanley-Jones <misty@docker.com>
2017-02-08 16:57:58 -08:00

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Markdown

---
title: "swarm update"
description: "The swarm update command description and usage"
keywords: "swarm, update"
---
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# swarm update
```markdown
Usage: docker swarm update [OPTIONS]
Update the swarm
Options:
--autolock Change manager autolocking setting (true|false)
--cert-expiry duration Validity period for node certificates (ns|us|ms|s|m|h) (default 2160h0m0s)
--dispatcher-heartbeat duration Dispatcher heartbeat period (ns|us|ms|s|m|h) (default 5s)
--external-ca external-ca Specifications of one or more certificate signing endpoints
--help Print usage
--max-snapshots uint Number of additional Raft snapshots to retain
--snapshot-interval uint Number of log entries between Raft snapshots (default 10000)
--task-history-limit int Task history retention limit (default 5)
```
## Description
Updates a swarm with new parameter values. This command must target a manager node.
## Examples
```bash
$ docker swarm update --cert-expiry 720h
```
## Related commands
* [swarm init](swarm_init.md)
* [swarm join](swarm_join.md)
* [swarm join-token](swarm_join_token.md)
* [swarm leave](swarm_leave.md)
* [swarm unlock](swarm_unlock.md)
* [swarm unlock-key](swarm_unlock_key.md)