62 lines
2.3 KiB
Markdown
62 lines
2.3 KiB
Markdown
<!--[metadata]>
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+++
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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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[menu.main]
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parent = "smn_cli"
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+++
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<![end-metadata]-->
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## update
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Usage: docker update [OPTIONS] CONTAINER [CONTAINER...]
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Updates container resource limits
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--help=false Print usage
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--blkio-weight=0 Block IO (relative weight), between 10 and 1000
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--cpu-shares=0 CPU shares (relative weight)
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--cpu-period=0 Limit the CPU CFS (Completely Fair Scheduler) period
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--cpu-quota=0 Limit the CPU CFS (Completely Fair Scheduler) quota
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--cpuset-cpus="" CPUs in which to allow execution (0-3, 0,1)
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--cpuset-mems="" Memory nodes (MEMs) in which to allow execution (0-3, 0,1)
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-m, --memory="" Memory limit
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--memory-reservation="" Memory soft limit
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--memory-swap="" A positive integer equal to memory plus swap. Specify -1 to enable unlimited swap
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--kernel-memory="" Kernel memory limit: container must be stopped
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The `docker update` command dynamically updates container resources. Use this
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command to prevent containers from consuming too many resources from their
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Docker host. With a single command, you can place limits on a single
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container or on many. To specify more than one container, provide
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space-separated list of container names or IDs.
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With the exception of the `--kernel-memory` value, you can specify these
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options on a running or a stopped container. You can only update
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`--kernel-memory` on a stopped container. When you run `docker update` on
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stopped container, the next time you restart it, the container uses those
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values.
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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 with cpu-shares=512
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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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