Try Docker as Beaker provider

[dfarrell07]

Most people seem to use Vagrant as the provider Beaker uses for standing up test VMs. I have that setup working well, but it's quite slow. Docker would allow caching of unchanged steps, dramatically speeding up the process.

This is a long-term TODO.

[dfarrell07]

Using the Beaker workflow described in the numbered points here dramatically speeds up testing, making this less critical.

[dfarrell07]

Vagrant Beaker tests have been historically unstable and are currently quite broken on my system. It's also not easy/possible to run VM-based tests on ODL'c CI VMs (nested virt issues), so moving containers is desirable for that future use-case. For both of these reasons, I'm bumping the prio of this TODO and am actively working on it.

[dfarrell07]

Commit 3aa0ccf added Docker-based Beaker tests for CentOS 7. They pass atm.

[dfarrell07]

Working on a Fedora 23 Docker-based Beaker test.

Using the official fedora:23 box, which at the moment backs up to fedora-23-20160104.

The box starts, Puppet installs and the Beaker tests start. Once we try to puppet module install puppetlabs-stdlib, the test fails with

Notice: Preparing to install into /etc/puppet/modules ...
    Notice: Downloading from https://forgeapi.puppetlabs.com ...
    Error: Could not extract contents of module archive: Execution of 'find . -type d -exec chmod 755 {} +' returned 127: sh: find: command not found
    Error: Try 'puppet help module install' for usage

So find isn't installed in the F23 container, which makes sense for size but breaks Puppet's module install process.

This is my spec/acceptance/nodeset/fedora-23-docker.yml file

HOSTS:
  fedora-23-docker:
    roles:
      - master
    platform: el-7-x86_64
    image: fedora:23
    docker_cmd: '["/sbin/init"]'
    hypervisor: docker

CONFIG:
  log_level: verbose
  type: foss