update更新容器配置

本文来自 https://docs.docker.com/engine/reference/commandline/update/

说明

更新一个或多个容器的配置

用法

docker update [OPTIONS] CONTAINER [CONTAINER...]

扩展说明

该docker update命令动态更新容器配置。您可以使用此命令来防止容器从其Docker主机消耗太多资源。使用单个命令，您可以在单个或多个容器上设置限制。要指定多个容器，请提供以空格分隔的容器名称或ID列表。

With the exception of the --kernel-memory option, you can specify these options on a running or a stopped container. On kernel version older than 4.6, you can only update --kernel-memory on a stopped container or on a running container with kernel memory initialized.

warn：该docker update和docker container update命令不支持Windows的容器。

参数

Name, shorthand	Default	Description
--blkio-weight		Block IO (relative weight), between 10 and 1000, or 0 to disable (default 0)
--cpu-period		Limit CPU CFS (Completely Fair Scheduler) period
--cpu-quota		Limit CPU CFS (Completely Fair Scheduler) quota
--cpu-rt-period		API 1.25+
Limit the CPU real-time period in microseconds
--cpu-rt-runtime		API 1.25+
Limit the CPU real-time runtime in microseconds
--cpu-shares , -c		CPU shares (relative weight)
--cpus		API 1.29+
Number of CPUs
--cpuset-cpus		CPUs in which to allow execution (0-3, 0,1)
--cpuset-mems		MEMs in which to allow execution (0-3, 0,1)
--kernel-memory		Kernel memory limit
--memory , -m		Memory limit
--memory-reservation		Memory soft limit
--memory-swap		Swap limit equal to memory plus swap: ‘-1’ to enable unlimited swap
--pids-limit		API 1.40+
Tune container pids limit (set -1 for unlimited)
--restart		Restart policy to apply when a container exits

例子

The following sections illustrate ways to use this command.

Update a container’s cpu-shares

To limit a container’s cpu-shares to 512, first identify the container name or ID. You can use docker ps to find these values. You can also use the ID returned from the docker run command. Then, do the following:

$ docker update --cpu-shares 512 abebf7571666

Update a container with cpu-shares and memory

To update multiple resource configurations for multiple containers:

$ docker update --cpu-shares 512 -m 300M abebf7571666 hopeful_morse

Update a container’s kernel memory constraints

You can update a container’s kernel memory limit using the --kernel-memory option. On kernel version older than 4.6, this option can be updated on a running container only if the container was started with --kernel-memory. If the container was started without --kernel-memory you need to stop the container before updating kernel memory.

For example, if you started a container with this command:

$ docker run -dit --name test --kernel-memory 50M ubuntu bash

You can update kernel memory while the container is running:

$ docker update --kernel-memory 80M test

If you started a container without kernel memory initialized:

$ docker run -dit --name test2 --memory 300M ubuntu bash

Update kernel memory of running container test2 will fail. You need to stop the container before updating the --kernel-memory setting. The next time you start it, the container uses the new value.

Kernel version newer than (include) 4.6 does not have this limitation, you can use --kernel-memory the same way as other options.

Update a container’s restart policy

You can change a container’s restart policy on a running container. The new restart policy takes effect instantly after you run docker update on a container.

To update restart policy for one or more containers:

$ docker update --restart=on-failure:3 abebf7571666 hopeful_morse

Note that if the container is started with “--rm” flag, you cannot update the restart policy for it. The AutoRemove and RestartPolicy are mutually exclusive for the container.

Parent command

Command	Description
docker	The base command for the Docker CLI.