| # swarm update | |
| <!---MARKER_GEN_START--> | |
| Update the swarm | |
| ### Options | |
| | Name | Type | Default | Description | | |
| |:-------------------------|:--------------|:------------|:------------------------------------------------------------| | |
| | `--autolock` | `bool` | | Change manager autolocking setting (true\|false) | | |
| | `--cert-expiry` | `duration` | `2160h0m0s` | Validity period for node certificates (ns\|us\|ms\|s\|m\|h) | | |
| | `--dispatcher-heartbeat` | `duration` | `5s` | Dispatcher heartbeat period (ns\|us\|ms\|s\|m\|h) | | |
| | `--external-ca` | `external-ca` | | Specifications of one or more certificate signing endpoints | | |
| | `--max-snapshots` | `uint64` | `0` | Number of additional Raft snapshots to retain | | |
| | `--snapshot-interval` | `uint64` | `10000` | Number of log entries between Raft snapshots | | |
| | `--task-history-limit` | `int64` | `5` | Task history retention limit | | |
| <!---MARKER_GEN_END--> | |
| ## Description | |
| Updates a swarm with new parameter values. | |
| > [!NOTE] | |
| > This is a cluster management command, and must be executed on a swarm | |
| > manager node. To learn about managers and workers, refer to the | |
| > [Swarm mode section](https://docs.docker.com/engine/swarm/) in the | |
| > documentation. | |
| ## Examples | |
| ```console | |
| $ docker swarm update --cert-expiry 720h | |
| ``` | |
| ## Related commands | |
| * [swarm ca](swarm_ca.md) | |
| * [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) |