Marathon Docker Tasks Failing - docker

Question

I have setup Marathon and Mesos on two of my machines.
I can successfully schedule commands from the marathon web console, but when I try to schedule a job involving docker images I immediately get job failed. Plus I get no stderr or stdout files.
Example Running a normal command:
Marathon job conf:
{
"id": "testecho",
"cmd": "echo hello; sleep 10",
"cpus": 1,
"mem": 128,
"disk": 0,
"instances": 1
}
On mesos I see that the tasks have succeeded. I have the stderr and stdout files like normal.
But now if I run a simple docker image task:
Marathon job conf:
{
"id": "/ubuntu",
"cmd": "date -u +%T",
"cpus": 0.5,
"mem": 512,
"disk": 0,
"instances": 1,
"container": {
"type": "DOCKER",
"volumes": [],
"docker": {
"image": "libmesos/ubuntu",
"network": null,
"portMappings": null,
"privileged": false,
"parameters": [],
"forcePullImage": false
}
},
"portDefinitions": [
{
"port": 10001,
"protocol": "tcp",
"labels": {}
}
]
}
On mesos, I see that it has instantly failed:
And I have no stderr or stdout files:
I also notice that on both my machines, when I run:
docker ps -a
I see nothing on both the machines. So that would mean that the docker jobs were not even launched
What could be affecting docker deployment?
The one reason I can think of is that the user that marathon uses to launch tasks not have access to docker? How do I test this?
I noticed that when I run the command:
sudo cat /etc/passwd
I see a user zookeeper. Maybe this is the user that doesn't have access to docker?
But when i do:
su zookeeper
I don't change user profiles

Answer 1

After going through a few tutorials I found the answer from the following tutorial: http://frankhinek.com/deploy-docker-containers-on-mesos-0-20/
I had to enable Docker Containerizer on my mesos-slaves
Set the --containerizers=docker,mesos" command line parameter:
echo "docker,mesos" | sudo tee /etc/mesos-slave/containerizers
Increase the executor timeout to 5 minutes1: (i guess this is optional)
echo "5mins" | sudo tee /etc/mesos-slave/executor_registration_timeout
Restart the Mesos Slave:
sudo service mesos-slave restart