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% DOCKER(1) Docker User Manuals
% Docker Community
% JUNE 2014
# NAME |
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docker-update - Update configuration of one or more containers |
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# SYNOPSIS
**docker update**
[**--blkio-weight**[=*[BLKIO-WEIGHT]*]]
[**--cpu-shares**[=*0*]]
[**--cpu-period**[=*0*]]
[**--cpu-quota**[=*0*]]
[**--cpuset-cpus**[=*CPUSET-CPUS*]]
[**--cpuset-mems**[=*CPUSET-MEMS*]]
[**--help**]
[**--kernel-memory**[=*KERNEL-MEMORY*]]
[**-m**|**--memory**[=*MEMORY*]]
[**--memory-reservation**[=*MEMORY-RESERVATION*]]
[**--memory-swap**[=*MEMORY-SWAP*]] |
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[**--restart**[=*""*]] |
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CONTAINER [CONTAINER...]
# DESCRIPTION
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The `docker update` command dynamically updates container configuration.
you can Use this command to prevent containers from consuming too many
resources from their Docker host. With a single command, you can place
limits on a single container or on many. To specify more than one container,
provide space-separated list of container names or IDs. |
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With the exception of the `--kernel-memory` value, you can specify these
options on a running or a stopped container. You can only update
`--kernel-memory` on a stopped container. When you run `docker update` on
stopped container, the next time you restart it, the container uses those
values.
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Another configuration you can change with this command is restart policy,
new restart policy will take effect instantly after you run `docker update`
on a container.
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# OPTIONS
**--blkio-weight**=0
Block IO weight (relative weight) accepts a weight value between 10 and 1000.
**--cpu-shares**=0
CPU shares (relative weight)
**--cpu-period**=0
Limit the CPU CFS (Completely Fair Scheduler) period
**--cpu-quota**=0
Limit the CPU CFS (Completely Fair Scheduler) quota
**--cpuset-cpus**=""
CPUs in which to allow execution (0-3, 0,1)
**--cpuset-mems**=""
Memory nodes(MEMs) in which to allow execution (0-3, 0,1). Only effective on NUMA systems.
**--help**
Print usage statement
**--kernel-memory**=""
Kernel memory limit (format: `<number>[<unit>]`, where unit = b, k, m or g)
Note that you can not update kernel memory to a running container, it can only
be updated to a stopped container, and affect after it's started.
**-m**, **--memory**=""
Memory limit (format: <number><optional unit>, where unit = b, k, m or g)
**--memory-reservation**=""
Memory soft limit (format: <number>[<unit>], where unit = b, k, m or g)
**--memory-swap**=""
Total memory limit (memory + swap)
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**--restart**=""
Restart policy to apply when a container exits (no, on-failure[:max-retry], always, unless-stopped).
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# EXAMPLES
The following sections illustrate ways to use this command.
### Update a container with cpu-shares=512
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:
```bash
$ docker update --cpu-shares 512 abebf7571666
```
### Update a container with cpu-shares and memory
To update multiple resource configurations for multiple containers:
```bash
$ docker update --cpu-shares 512 -m 300M abebf7571666 hopeful_morse
``` |
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### Update a container's restart policy
To update restart policy for one or more containers:
```bash
$ docker update --restart=on-failure:3 abebf7571666 hopeful_morse
``` |