Docker Cookbook

"id"
:
"privileged-job"
,
"container"
:
{
"docker"
:
{
"image"
:
"mesosphere/inky"
"privileged"
:
true
,
"parameters"
:
[
{
"key"
:
"hostname"
,
"value"
:
"a.corp.org"
},
{
"key"
:
"volumes-from"
,
"value"
:
"another-container"
},
{
"key"
:
"lxc-conf"
,
"value"
:
"..."
}
]
},
"type"
:
"DOCKER"
,
"volumes"
:
[]
},
"args"
:
[
"hello"
],
"cpus"
:
0.2
,
"mem"
:
32.0
,
"instances"
:
1
}
Finally, running Mesos on a single host defeats the purpose of this recipe, and you
will want to create a Mesos cluster with the Docker containerizer enabled on all
Mesos slaves.
See Also
• Mesosphere 
documentation
 for the Docker containerizer
• Marathon 
example
JSON files
• Original 
post
this recipe is based on
7.11 Running Containers via Apache Mesos and Marathon | 223

---

7.12 Using the Mesos Docker Containerizer on a Mesos
Cluster
Problem
In 
Recipe 7.11
, you saw how to test the Mesos Docker containerizer to run containers
on a Mesos sandbox. You would like to do the same but on a Mesos cluster.
Solution
Build a Mesos cluster using containers and the images prepared by 
Mesosphere
 on
the Docker Hub. Configure the Mesos slave to use the Docker containerizer.
To facilitate testing this recipe, use the online material accompanying this book. This
recipe uses a Vagrantfile that sets up a local three-node Mesos cluster and uses Ansi‐
ble to start the container that runs the Mesos software components (i.e., ZooKeeper,
Mesos master, Marathon framework, and Mesos slave).
Clone the repository if you have not done so already, head to 
ch07/mesos
, and use
Vagrant to bring up the three-node cluster:
If you have enough memory on your local machine, you can add
more nodes to this setup or change the memory allocated to each
node (see the Vagrantfile).
$ git clone https://github.com/how2dock/docbook.git
$ cd dockbook/ch07/mesos
$ vagrant up
$ vagrant status
Current machine states:
mesos-head running (virtualbox)
mesos-1 running (virtualbox)
mesos-2 running (virtualbox)
If you have followed along recipe by recipe, you will have read 
Recipe 7.8
. If not, read
that recipe first to configure 
Ansible
on your machine. You will use an Ansible play‐
book to start a few containers on the VM. The playbook is 
mesos.yml
. To start all con‐
tainers, run the playbook:
$ ansible-playbook -u vagrant mesos.yml
Once the play is done, the Mesos head node will have three containers running (i.e.,
ZooKeeper, Mesos master, and the Marathon framework). The two slaves will have
one container running (i.e., the Mesos slave). All images come from Docker Hub.