mirror of https://github.com/docker/cli.git
121 lines
4.5 KiB
Markdown
121 lines
4.5 KiB
Markdown
---
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title: "update"
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description: "The update command description and usage"
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keywords: ["resources, update, dynamically"]
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---
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<!-- This file is maintained within the docker/docker Github
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## update
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```markdown
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Usage: docker update [OPTIONS] CONTAINER [CONTAINER...]
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Update configuration of one or more containers
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Options:
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--blkio-weight value Block IO (relative weight), between 10 and 1000
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--cpu-period int Limit CPU CFS (Completely Fair Scheduler) period
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--cpu-quota int Limit CPU CFS (Completely Fair Scheduler) quota
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-c, --cpu-shares int CPU shares (relative weight)
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--cpu-rt-period int Limit the CPU real-time period in microseconds
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--cpu-rt-runtime int Limit the CPU real-time runtime in microseconds
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--cpuset-cpus string CPUs in which to allow execution (0-3, 0,1)
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--cpuset-mems string MEMs in which to allow execution (0-3, 0,1)
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--help Print usage
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--kernel-memory string Kernel memory limit
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-m, --memory string Memory limit
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--memory-reservation string Memory soft limit
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--memory-swap string Swap limit equal to memory plus swap: '-1' to enable unlimited swap
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--restart string Restart policy to apply when a container exits
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```
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The `docker update` command dynamically updates container configuration.
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You can use this command to prevent containers from consuming too many
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resources from their Docker host. With a single command, you can place
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limits on a single container or on many. To specify more than one container,
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provide space-separated list of container names or IDs.
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With the exception of the `--kernel-memory` option, you can specify these
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options on a running or a stopped container. On kernel version older than
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4.6, you can only update `--kernel-memory` on a stopped container or on
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a running container with kernel memory initialized.
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## Examples
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The following sections illustrate ways to use this command.
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### Update a container's cpu-shares
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To limit a container's cpu-shares to 512, first identify the container
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name or ID. You can use `docker ps` to find these values. You can also
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use the ID returned from the `docker run` command. Then, do the following:
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```bash
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$ docker update --cpu-shares 512 abebf7571666
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```
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### Update a container with cpu-shares and memory
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To update multiple resource configurations for multiple containers:
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```bash
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$ docker update --cpu-shares 512 -m 300M abebf7571666 hopeful_morse
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```
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### Update a container's kernel memory constraints
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You can update a container's kernel memory limit using the `--kernel-memory`
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option. On kernel version older than 4.6, this option can be updated on a
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running container only if the container was started with `--kernel-memory`.
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If the container was started *without* `--kernel-memory` you need to stop
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the container before updating kernel memory.
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For example, if you started a container with this command:
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```bash
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$ docker run -dit --name test --kernel-memory 50M ubuntu bash
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```
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You can update kernel memory while the container is running:
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```bash
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$ docker update --kernel-memory 80M test
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```
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If you started a container *without* kernel memory initialized:
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```bash
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$ docker run -dit --name test2 --memory 300M ubuntu bash
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```
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Update kernel memory of running container `test2` will fail. You need to stop
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the container before updating the `--kernel-memory` setting. The next time you
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start it, the container uses the new value.
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Kernel version newer than (include) 4.6 does not have this limitation, you
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can use `--kernel-memory` the same way as other options.
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### Update a container's restart policy
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You can change a container's restart policy on a running container. The new
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restart policy takes effect instantly after you run `docker update` on a
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container.
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To update restart policy for one or more containers:
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```bash
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$ docker update --restart=on-failure:3 abebf7571666 hopeful_morse
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```
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Note that if the container is started with "--rm" flag, you cannot update the restart
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policy for it. The `AutoRemove` and `RestartPolicy` are mutually exclusive for the
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container.
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