docker-update

dynamically update container resource limits

TLDR

Update CPU limit

$ docker update --cpus [2] [container]

Update memory limit

$ docker update --memory [512m] [container]

Update restart policy

$ docker update --restart [always] [container]

Update multiple containers

$ docker update --memory [1g] [container1] [container2]

Remove memory limit

$ docker update --memory [0] [container]

SYNOPSIS

docker update [options] container [container...]

docker update dynamically updates container resource constraints. Allows changing CPU, memory, and restart settings without recreating the container. Can update running or stopped containers. Not supported for Windows containers.

PARAMETERS

--cpus decimal

Number of CPUs.

--memory, -m bytes

Memory limit.

--memory-swap bytes

Swap limit (-1 for unlimited).

--restart string

Restart policy (no, on-failure, always, unless-stopped).

--cpu-shares int

CPU shares (relative weight).

--memory-reservation bytes

Memory soft limit.

--cpuset-cpus string

CPUs in which to allow execution (e.g., 0-3, 0,1).

--pids-limit int

Tune container pids limit (-1 for unlimited).

--blkio-weight uint16

Block IO relative weight (10-1000), 0 to disable.

--cpu-period int

Limit CPU CFS period (microseconds).

--cpu-quota int

Limit CPU CFS quota (microseconds).

CAVEATS

The --kernel-memory option has been deprecated since Docker 20.10. Memory changes on running containers may require a restart to take full effect on some systems.