有时候创建容器时忘记加上 --restart=always，导致当服务器重启、Docker 重启，容器未能自启动，导致服务不可用。这时候可以通过 docker update命令来更新容器的配置。

查看 docker update 支持哪些操作

➜  ~ docker update --help 

Usage:  docker update [OPTIONS] CONTAINER [CONTAINER...]

Update configuration of one or more containers

Options:
      --blkio-weight uint16        Block IO (relative weight), between 10 and 1000, or 0 to disable (default 0)
      --cpu-period int             Limit CPU CFS (Completely Fair Scheduler) period
      --cpu-quota int              Limit CPU CFS (Completely Fair Scheduler) quota
      --cpu-rt-period int          Limit the CPU real-time period in microseconds
      --cpu-rt-runtime int         Limit the CPU real-time runtime in microseconds
  -c, --cpu-shares int             CPU shares (relative weight)
      --cpus decimal               Number of CPUs
      --cpuset-cpus string         CPUs in which to allow execution (0-3, 0,1)
      --cpuset-mems string         MEMs in which to allow execution (0-3, 0,1)
      --kernel-memory bytes        Kernel memory limit
  -m, --memory bytes               Memory limit
      --memory-reservation bytes   Memory soft limit
      --memory-swap bytes          Swap limit equal to memory plus swap: '-1' to enable unlimited swap
      --pids-limit int             Tune container pids limit (set -1 for unlimited)
      --restart string             Restart policy to apply when a container exits

修改容器的重启策略

语法如下，container_name、container_id 仅需要传入任意一个即可：

docker update --restart=always <container_name | container_id>

container_name、container_id 可以使用 docker ps 查看获取

CONTAINER ID   IMAGE                COMMAND                  CREATED       STATUS        PORTS     NAMES
4f358a08b3b5   snowdreamtech/frpc   "/bin/sh -c '/usr/bi…"   4 weeks ago   Up 25 hours             frpc_nowtime-test

示例

更多的使用方法请参考 docker update 命令的官方文档

https://docs.docker.com/engine/reference/commandline/update/

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