1# swarm update
2
3<!---MARKER_GEN_START-->
4Update the swarm
5
6### Options
7
8| Name | Type | Default | Description |
9|:-------------------------|:--------------|:------------|:------------------------------------------------------------|
10| `--autolock` | | | Change manager autolocking setting (true\|false) |
11| `--cert-expiry` | `duration` | `2160h0m0s` | Validity period for node certificates (ns\|us\|ms\|s\|m\|h) |
12| `--dispatcher-heartbeat` | `duration` | `5s` | Dispatcher heartbeat period (ns\|us\|ms\|s\|m\|h) |
13| `--external-ca` | `external-ca` | | Specifications of one or more certificate signing endpoints |
14| `--max-snapshots` | `uint64` | `0` | Number of additional Raft snapshots to retain |
15| `--snapshot-interval` | `uint64` | `10000` | Number of log entries between Raft snapshots |
16| `--task-history-limit` | `int64` | `5` | Task history retention limit |
17
18
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20
21## Description
22
23Updates a swarm with new parameter values.
24
25> **Note**
26>
27> This is a cluster management command, and must be executed on a swarm
28> manager node. To learn about managers and workers, refer to the
29> [Swarm mode section](https://docs.docker.com/engine/swarm/) in the
30> documentation.
31
32## Examples
33
34```console
35$ docker swarm update --cert-expiry 720h
36```
37
38## Related commands
39
40* [swarm ca](swarm_ca.md)
41* [swarm init](swarm_init.md)
42* [swarm join](swarm_join.md)
43* [swarm join-token](swarm_join-token.md)
44* [swarm leave](swarm_leave.md)
45* [swarm unlock](swarm_unlock.md)
46* [swarm unlock-key](swarm_unlock-key.md)
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