2016-10-14 22:30:36 +00:00
|
|
|
---
|
|
|
|
title: "update"
|
|
|
|
description: "The update command description and usage"
|
|
|
|
keywords: ["resources, update, dynamically"]
|
|
|
|
---
|
2015-12-28 11:19:26 +00:00
|
|
|
|
|
|
|
## update
|
|
|
|
|
2016-07-07 18:43:18 +00:00
|
|
|
```markdown
|
|
|
|
Usage: docker update [OPTIONS] CONTAINER [CONTAINER...]
|
2015-12-28 11:19:26 +00:00
|
|
|
|
2016-07-07 18:43:18 +00:00
|
|
|
Update configuration of one or more containers
|
2015-12-28 11:19:26 +00:00
|
|
|
|
2016-07-07 18:43:18 +00:00
|
|
|
Options:
|
|
|
|
--blkio-weight value Block IO (relative weight), between 10 and 1000
|
|
|
|
--cpu-period int Limit CPU CFS (Completely Fair Scheduler) period
|
|
|
|
--cpu-quota int Limit CPU CFS (Completely Fair Scheduler) quota
|
|
|
|
-c, --cpu-shares int CPU shares (relative weight)
|
|
|
|
--cpuset-cpus string CPUs in which to allow execution (0-3, 0,1)
|
|
|
|
--cpuset-mems string MEMs in which to allow execution (0-3, 0,1)
|
|
|
|
--help Print usage
|
|
|
|
--kernel-memory string Kernel memory limit
|
|
|
|
-m, --memory string Memory limit
|
|
|
|
--memory-reservation string Memory soft limit
|
|
|
|
--memory-swap string Swap limit equal to memory plus swap: '-1' to enable unlimited swap
|
|
|
|
--restart string Restart policy to apply when a container exits
|
|
|
|
```
|
2015-12-28 11:19:26 +00:00
|
|
|
|
2016-01-04 15:58:20 +00:00
|
|
|
The `docker update` command dynamically updates container configuration.
|
2016-10-14 22:30:36 +00:00
|
|
|
You can use this command to prevent containers from consuming too many
|
|
|
|
resources from their Docker host. With a single command, you can place
|
2016-07-12 12:29:02 +00:00
|
|
|
limits on a single container or on many. To specify more than one container,
|
|
|
|
provide space-separated list of container names or IDs.
|
2015-12-28 11:19:26 +00:00
|
|
|
|
2016-07-12 12:29:02 +00:00
|
|
|
With the exception of the `--kernel-memory` option, you can specify these
|
2016-07-27 01:03:15 +00:00
|
|
|
options on a running or a stopped container. On kernel version older than
|
|
|
|
4.6, you can only update `--kernel-memory` on a stopped container or on
|
|
|
|
a running container with kernel memory initialized.
|
2016-01-04 15:58:20 +00:00
|
|
|
|
2016-09-18 03:00:19 +00:00
|
|
|
## Examples
|
2015-12-28 11:19:26 +00:00
|
|
|
|
|
|
|
The following sections illustrate ways to use this command.
|
|
|
|
|
2016-07-12 12:29:02 +00:00
|
|
|
### Update a container's cpu-shares
|
2015-12-28 11:19:26 +00:00
|
|
|
|
|
|
|
To limit a container's cpu-shares to 512, first identify the container
|
2016-07-12 12:29:02 +00:00
|
|
|
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:
|
2015-12-28 11:19:26 +00:00
|
|
|
|
|
|
|
```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
|
|
|
|
```
|
2016-01-04 15:58:20 +00:00
|
|
|
|
2016-07-12 12:29:02 +00:00
|
|
|
### Update a container's kernel memory constraints
|
|
|
|
|
|
|
|
You can update a container's kernel memory limit using the `--kernel-memory`
|
2016-07-27 01:03:15 +00:00
|
|
|
option. On kernel version older than 4.6, this option can be updated on a
|
|
|
|
running container only if the container was started with `--kernel-memory`.
|
|
|
|
If the container was started *without* `--kernel-memory` you need to stop
|
|
|
|
the container before updating kernel memory.
|
2016-07-12 12:29:02 +00:00
|
|
|
|
|
|
|
For example, if you started a container with this command:
|
|
|
|
|
|
|
|
```bash
|
|
|
|
$ docker run -dit --name test --kernel-memory 50M ubuntu bash
|
|
|
|
```
|
|
|
|
|
|
|
|
You can update kernel memory while the container is running:
|
|
|
|
|
|
|
|
```bash
|
|
|
|
$ docker update --kernel-memory 80M test
|
|
|
|
```
|
|
|
|
|
|
|
|
If you started a container *without* kernel memory initialized:
|
|
|
|
|
|
|
|
```bash
|
|
|
|
$ docker run -dit --name test2 --memory 300M ubuntu bash
|
|
|
|
```
|
|
|
|
|
|
|
|
Update kernel memory of running container `test2` will fail. You need to stop
|
|
|
|
the container before updating the `--kernel-memory` setting. The next time you
|
|
|
|
start it, the container uses the new value.
|
|
|
|
|
2016-07-27 01:03:15 +00:00
|
|
|
Kernel version newer than (include) 4.6 does not have this limitation, you
|
|
|
|
can use `--kernel-memory` the same way as other options.
|
2016-07-12 12:29:02 +00:00
|
|
|
|
2016-01-04 15:58:20 +00:00
|
|
|
### Update a container's restart policy
|
|
|
|
|
2016-07-12 12:29:02 +00:00
|
|
|
You can change a container's restart policy on a running container. The new
|
|
|
|
restart policy takes effect instantly after you run `docker update` on a
|
|
|
|
container.
|
|
|
|
|
2016-01-04 15:58:20 +00:00
|
|
|
To update restart policy for one or more containers:
|
2016-07-12 12:29:02 +00:00
|
|
|
|
2016-01-04 15:58:20 +00:00
|
|
|
```bash
|
|
|
|
$ docker update --restart=on-failure:3 abebf7571666 hopeful_morse
|
|
|
|
```
|
2016-08-15 08:38:47 +00:00
|
|
|
|
|
|
|
Note that if the container is started with "--rm" flag, you cannot update the restart
|
|
|
|
policy for it. The `AutoRemove` and `RestartPolicy` are mutually exclusive for the
|
|
|
|
container.
|