docker update command explained with examples

The docker update command dynamically updates container configuration. You can use this command to prevent containers from consuming too many resources such as CPU and memory from their Docker host. With a single command, you can place limits on a single container or on many.

Notes

With the exception of the –kernel-memory option, you can specify these 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.

The docker update command dynamically updates container configuration. You can use this command to prevent containers from consuming too many resources such as CPU and memory from their Docker host. With a single command, you can place limits on a single container or on many.

Notes

With the exception of the –kernel-memory option, you can specify these 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.

You can use “docker container update” instead of “docker update” as well.

Docker update command Example

Options

Name, shorthandDefaultDescription
--blkio-weightBlock IO (relative weight), between 10 and 1000, or 0 to disable (default 0)
--cpu-periodLimit CPU CFS (Completely Fair Scheduler) period
--cpu-quotaLimit CPU CFS (Completely Fair Scheduler) quota
--cpu-rt-periodAPI 1.25+
Limit the CPU real-time period in microseconds
--cpu-rt-runtimeAPI 1.25+
Limit the CPU real-time runtime in microseconds
--cpu-shares , -cCPU shares (relative weight)
--cpusAPI 1.29+
Number of CPUs
--cpuset-cpusCPUs in which to allow execution (0-3, 0,1)
--cpuset-memsMEMs in which to allow execution (0-3, 0,1)
--kernel-memoryKernel memory limit
--memory , -mMemory limit
--memory-reservationMemory soft limit
--memory-swapSwap limit equal to memory plus swap: ‘-1’ to enable unlimited swap
--pids-limitAPI 1.40+
Tune container pids limit (set -1 for unlimited)
--restartRestart policy to apply when a container exits
Rajesh Kumar
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