Upgrade to Mesos 0.20.0 Docker

1. Install add-apt-repository

    $ sudo apt-get install software-properties-common python-software-properties
   

2. Add repo with latest Docker

    $ sudo add-apt-repository ppa:docker-maint/testing
   

3. Update list of packages from newly-added repo

    $ sudo apt-get update
   

4. FINALLY INSTALL DOCKER (<3 Ubuntu)

    $ sudo apt-get install docker.io
   

5. Verify dat. Make sure it's 1.0+.

    $ docker --version
    Docker version 1.2.0-dev, build bc41261
   

6. Follow the Mesos Native Docker guide

7. Restart the Mesos slave to use the containerizer

    $ sudo service mesos-slave restart