docker container update
| Description | Update configuration of one or more containers |
|---|---|
| Usage | docker container update [OPTIONS] CONTAINER [CONTAINER...] |
| Aliases | docker update |
Description
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.
WarningThe
docker updateanddocker container updatecommands are not supported for Windows containers.
Options
| Option | Default | Description |
|---|---|---|
--blkio-weight | Block IO (relative weight), between 10 and 1000, or 0 to disable (default 0) | |
--cpu-period | Limit CPU CFS (Completely Fair Scheduler) period | |
--cpu-quota | Limit CPU CFS (Completely Fair Scheduler) quota | |
--cpu-rt-period | API 1.25+ Limit the CPU real-time period in microseconds | |
--cpu-rt-runtime | API 1.25+ Limit the CPU real-time runtime in microseconds | |
-c, --cpu-shares | CPU shares (relative weight) | |
--cpus | API 1.29+ Number of CPUs | |
--cpuset-cpus | CPUs in which to allow execution (0-3, 0,1) | |
--cpuset-mems | MEMs in which to allow execution (0-3, 0,1) | |
-m, --memory | Memory limit | |
--memory-reservation | Memory soft limit | |
--memory-swap | Swap limit equal to memory plus swap: -1 to enable unlimited swap | |
--pids-limit | API 1.40+ Tune container pids limit (set -1 for unlimited) | |
--restart | Restart policy to apply when a container exits |
Examples
The following sections illustrate ways to use this command.
Update a container's cpu-shares (--cpu-shares)
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:
$ docker update --cpu-shares 512 abebf7571666
Update a container with cpu-shares and memory (-m, --memory)
To update multiple resource configurations for multiple containers:
$ docker update --cpu-shares 512 -m 300M abebf7571666 hopeful_morse
Update a container's restart policy (--restart)
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.
To update restart policy for one or more containers:
$ docker update --restart=on-failure:3 abebf7571666 hopeful_morse
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.