How to change the resources allocated to a container at run time?

Question

I am aware that I can limit the resources allocated to a container while provisioning using docker with the -c and -m flags for CPU and memory.

Answer 1

At the time (Docker v1.11.1) has the command docker update (view docs). With this you can change allocated resources on the fly.

Usage:  docker update [OPTIONS] CONTAINER [CONTAINER...]

Update configuration of one or more containers

  --blkio-weight          Block IO (relative weight), between 10 and 1000
  --cpu-shares            CPU shares (relative weight)
  --cpu-period            Limit CPU CFS (Completely Fair Scheduler) period
  --cpu-quota             Limit CPU CFS (Completely Fair Scheduler) quota
  --cpuset-cpus           CPUs in which to allow execution (0-3, 0,1)
  --cpuset-mems           MEMs in which to allow execution (0-3, 0,1)
  --help                  Print usage
  --kernel-memory         Kernel memory limit
  -m, --memory            Memory limit
  --memory-reservation    Memory soft limit
  --memory-swap           Swap limit equal to memory plus swap: '-1' to enable unlimited swap
  --restart               Restart policy to apply when a container exits