github.com/kim0/docker@v0.6.2-0.20161130212042-4addda3f07e7/docs/reference/commandline/swarm_update.md (about)

     1  ---
     2  title: "swarm update"
     3  description: "The swarm update command description and usage"
     4  keywords: ["swarm, update"]
     5  ---
     6  
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    15  
    16  # swarm update
    17  
    18  ```markdown
    19  Usage:  docker swarm update [OPTIONS]
    20  
    21  Update the swarm
    22  
    23  Options:
    24        --cert-expiry duration            Validity period for node certificates (default 2160h0m0s)
    25        --dispatcher-heartbeat duration   Dispatcher heartbeat period (default 5s)
    26        --external-ca value               Specifications of one or more certificate signing endpoints
    27        --help                            Print usage
    28        --task-history-limit int          Task history retention limit (default 5)
    29  ```
    30  
    31  Updates a swarm with new parameter values. This command must target a manager node.
    32  
    33  
    34  ```bash
    35  $ docker swarm update --cert-expiry 720h
    36  ```
    37  
    38  ## Related information
    39  
    40  * [swarm init](swarm_init.md)
    41  * [swarm join](swarm_join.md)
    42  * [swarm leave](swarm_leave.md)