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It's used for updating properties of one or more containers, we only support resource configs for now. It can be extended in the future. Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
93 lines
2.8 KiB
Markdown
93 lines
2.8 KiB
Markdown
% DOCKER(1) Docker User Manuals
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% Docker Community
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% JUNE 2014
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# NAME
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docker-update - Update resource configs of one or more containers
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# SYNOPSIS
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**docker update**
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[**--blkio-weight**[=*[BLKIO-WEIGHT]*]]
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[**--cpu-shares**[=*0*]]
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[**--cpu-period**[=*0*]]
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[**--cpu-quota**[=*0*]]
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[**--cpuset-cpus**[=*CPUSET-CPUS*]]
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[**--cpuset-mems**[=*CPUSET-MEMS*]]
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[**--help**]
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[**--kernel-memory**[=*KERNEL-MEMORY*]]
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[**-m**|**--memory**[=*MEMORY*]]
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[**--memory-reservation**[=*MEMORY-RESERVATION*]]
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[**--memory-swap**[=*MEMORY-SWAP*]]
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CONTAINER [CONTAINER...]
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# DESCRIPTION
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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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# OPTIONS
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**--blkio-weight**=0
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Block IO weight (relative weight) accepts a weight value between 10 and 1000.
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**--cpu-shares**=0
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CPU shares (relative weight)
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**--cpu-period**=0
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Limit the CPU CFS (Completely Fair Scheduler) period
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**--cpu-quota**=0
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Limit the CPU CFS (Completely Fair Scheduler) quota
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**--cpuset-cpus**=""
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CPUs in which to allow execution (0-3, 0,1)
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**--cpuset-mems**=""
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Memory nodes(MEMs) in which to allow execution (0-3, 0,1). Only effective on NUMA systems.
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**--help**
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Print usage statement
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**--kernel-memory**=""
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Kernel memory limit (format: `<number>[<unit>]`, where unit = b, k, m or g)
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Note that you can not update kernel memory to a running container, it can only
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be updated to a stopped container, and affect after it's started.
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**-m**, **--memory**=""
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Memory limit (format: <number><optional unit>, where unit = b, k, m or g)
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**--memory-reservation**=""
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Memory soft limit (format: <number>[<unit>], where unit = b, k, m or g)
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**--memory-swap**=""
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Total memory limit (memory + swap)
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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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