DockerCLI/docs/reference/commandline/update.md

62 lines
2.3 KiB
Markdown

<!--[metadata]>
+++
title = "update"
description = "The update command description and usage"
keywords = ["resources, update, dynamically"]
[menu.main]
parent = "smn_cli"
+++
<![end-metadata]-->
## update
Usage: docker update [OPTIONS] CONTAINER [CONTAINER...]
Updates container resource limits
--help=false Print usage
--blkio-weight=0 Block IO (relative weight), 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)
-m, --memory="" Memory limit
--memory-reservation="" Memory soft limit
--memory-swap="" A positive integer equal to memory plus swap. Specify -1 to enable unlimited swap
--kernel-memory="" Kernel memory limit: container must be stopped
The `docker update` command dynamically updates container resources. 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.
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.
## 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
```