Unable to create more than 200 containers by default

[dhiltgen]

If you attempt to create more than 200 containers, you get a rather confusing error message from the daemon.

docker[5776]: time="2016-04-06T18:50:58Z" level=error msg="containerd: start container" error="oci runtime error: could not synchronise with container process: could not create session key: disk quota exceeded" id=364fa0569db4475be3ef5f4ecf8c4751a84fa064ad7f6e05505137c65a629430
docker[5776]: time="2016-04-06T18:50:58.265141539Z" level=error msg="Handler for POST /v1.15/containers/364fa0569db4475be3ef5f4ecf8c4751a84fa064ad7f6e05505137c65a629430/start returned error: rpc error: code = 2 desc = \"oci runtime error: could not synchronise with container process: could not create session key: disk quota exceeded\""

It appears that #582 coupled with the default /proc/sys/kernel/keys/ quota leads to this.

Ideally users shouldn't have to modify this by hand to run more than 200 containers on the system.

[marcosnils]

@dhiltgen have you tried containerd?. Seems to me like runC is already battle tested.

https://github.com/docker/containerd

[dhiltgen]

I was using docker 1.11.0-rc3

[crosbymichael]

This is being fixed in the upper layers. There is not much we should do at this layer.

[crosbymichael]

@dhiltgen you can follow the progress for the change in docker here:

moby/moby#22865