From: "Tim Chen" <tim@mesosphere.io>
To: user@mesos.apache.org, "Gabriel Monroy" <gabriel@opdemand.com>
Sent: Tuesday, September 23, 2014 2:41:17 AM
Subject: Re: Running mesos-slave in Docker container

Hi Grzegorz,

To run Mesos master|slave in a docker container is not straight forward because we utilize kernel features therefore you need to explicitly test out the features you like to use with Mesos with slave/master in Docker.

Gabriel during the Mesosphere hackathon has got master and slave running in docker containers, and he can probably share his Dockerfile and run command.

I believe one work around to get cgroups working with Docker run is to mount /sys into the container (mount -v /sys:/sys).

Gabriel do you still have the command you used to run slave/master with Docker?

Tim

On Tue, Sep 23, 2014 at 12:24 AM, Grzegorz Graczyk <gregory90@gmail.com> wrote:

I'm trying to run mesos-slave inside Docker container, but it can't start due to problem with mounting cgroups.

I'm using:

Kernel Version: 3.13.0-32-generic

Operating System: Ubuntu 14.04.1 LTS

Docker: 1.2.0(commit fa7b24f)
Mesos: 0.20.0

Following error appears:

I0923 07:11:20.921475    19 main.cpp:126] Build: 2014-08-22 05:04:26 by root

I0923 07:11:20.921608    19 main.cpp:128] Version: 0.20.0

I0923 07:11:20.921620    19 main.cpp:131] Git tag: 0.20.0

I0923 07:11:20.921628    19 main.cpp:135] Git SHA: f421ffdf8d32a8834b3a6ee483b5b59f65956497

Failed to create a containerizer: Could not create DockerContainerizer: Failed to find a mounted cgroups hierarchy for the 'cpu' subsystem; you probably need to mount cgroups manually!

I'm running docker container with command:
docker run --name mesos-slave --privileged --net=host -v /var/run/docker.sock:/var/run/docker.sock -v /var/lib/docker:/var/lib/docker -v /usr/local/bin/docker:/usr/local/bin/docker gregory90/mesos-slave --containerizers=docker,mesos --master=zk://localhost:2181/mesos --ip=127.0.0.1

Everything is running on single machine.

Everything works as expected when mesos-slave is run outside docker container.

I'd appreciate some help.