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, shorthand | 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 | |
--cpu-shares , -c | 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) | |
--kernel-memory | Kernel memory limit | |
--memory , -m | 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 |
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