linux - Change swappiness for docker container -

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i using docker containerize bunch of services. times, containerized services heavily swaps. i've changed vm.swappiness 1 via sysctl on host system. docker's memory cgroup still have old (default) value of 60. therefore, particular containers' cgroups have same value, parent.

sysctl vm.swappiness > vm.swappiness = 1 cat /sys/fs/cgroup/memory/docker/memory.swappiness > 60 cat /sys/fs/cgroup/memory/docker/${container_id}/memory.swappiness > 60

all attempts change swappiness manually (by echoing desired value memory.swappiness file) fails permission denied.

subject: how can restrict containers swappiness?

i using ubuntu 12.04 kernel 3.13, docker version 1.1.2 native execution driver (not lxc) of version 0.2. kernel loaded cgroup_enable=memory swapaccount=1.

if upgrade 3.18 kernel or later, restriction preventing modification cgroup memory.swappiness parameter in child/hierarchy cgroups removed. linux kernel patch removed restriction can seen here: https://github.com/torvalds/linux/commit/3dae7fec5e884a4e72e5416db0894de66f586201

docker 1.8 include following pr (https://github.com/docker/docker/pull/14004) allows container set own memory.swappiness value allowing user control on cgroup setting, long docker daemon host kernel has patch noted above, or host kernel 3.18 or greater.


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