docker-container-update(1)



DOCKER(1)                                                            DOCKER(1)

NAME
       docker-container-update - Update configuration of one or more
       containers

SYNOPSIS
       docker container update [OPTIONS] CONTAINER [CONTAINER...]

DESCRIPTION
       The docker container 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.

       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.

OPTIONS
kernel-memory
       Kernel memory limit (format: <number>[<unit>], where unit = b, k, m or
       g)

       Note that on kernel version older than 4.6, you can not update kernel
       memory on a running container if the container is started without
       kernel memory initialized, in this case, it can only be updated after
       it's stopped. The new setting takes effect when the container is
       started.

memory
       Memory limit (format: <number><optional unit>, where unit = b, k, m or
       g)

       Note that the memory should be smaller than the already set swap memory
       limit.  If you want update a memory limit bigger than the already set
       swap memory limit, you should update swap memory limit at the same
       time. If you don't set swap memory limit on docker create/run but only
       memory limit, the swap memory is double the memory limit.

EXAMPLES
       The following sections illustrate ways to use this command.

   Update a container's 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 container update --cpu-shares 512 abebf7571666

   Update a container with cpu-shares and memory
       To update multiple resource configurations for multiple containers:

              $ docker container update --cpu-shares 512 -m 300M abebf7571666 hopeful_morse

   Update a container's kernel memory constraints
       You can update a container's kernel memory limit using the
       --kernel-memory 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.

       For example, if you started a container with this command:

              $ docker run -dit --name test --kernel-memory 50M ubuntu bash

       You can update kernel memory while the container is running:

              $ docker container update --kernel-memory 80M test

       If you started a container without kernel memory initialized:

              $ 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.

       Kernel version newer than (include) 4.6 does not have this limitation,
       you can use --kernel-memory the same way as other options.

   Update a container's restart policy
       You can change a container's restart policy on a running container. The
       new restart policy takes effect instantly after you run docker
       container update on a container.

       To update restart policy for one or more containers:

              $ docker container 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.

OPTIONS
       --blkio-weight=0
           Block IO (relative weight), between 10 and 1000, or 0 to disable
       (default 0)

       --cpu-period=0
           Limit CPU CFS (Completely Fair Scheduler) period

       --cpu-quota=0
           Limit CPU CFS (Completely Fair Scheduler) quota

       --cpu-rt-period=0
           Limit the CPU real-time period in microseconds

       --cpu-rt-runtime=0
           Limit the CPU real-time runtime in microseconds

       -c, --cpu-shares=0
           CPU shares (relative weight)

       --cpus=
           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=0
           Kernel memory limit

       -m, --memory=0
           Memory limit

       --memory-reservation=0
           Memory soft limit

       --memory-swap=0
           Swap limit equal to memory plus swap: '-1' to enable unlimited swap

       --restart=""
           Restart policy to apply when a container exits

SEE ALSO
       docker-container(1)

Docker Community                   Sep 2017                          DOCKER(1)

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