--- title: "swarm update" description: "The swarm update command description and usage" keywords: "swarm, update" --- <!-- This file is maintained within the docker/docker Github repository at https://github.com/docker/docker/. Make all pull requests against that repo. If you see this file in another repository, consider it read-only there, as it will periodically be overwritten by the definitive file. Pull requests which include edits to this file in other repositories will be rejected. --> # 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) ``` Updates a swarm with new parameter values. This command must target a manager node. ```bash $ docker swarm update --cert-expiry 720h ``` ## Related information * [swarm init](swarm_init.md) * [swarm join](swarm_join.md) * [swarm leave](swarm_leave.md)