Teuthology docker targets hack (2/5)

The teuthology container hack is improved to snapshot the container after Ceph and its dependencies have been installed. It helps quickly testing ceph-qa-suite tasks. A job doing nothing but install the Firefly version of Ceph takes 14 seconds after the initial installation (which can take between 5 to 15 minutes depending on how fast is the machine and how much bandwidth is available).

...
2014-11-17 01:21:00,067.067 INFO:teuthology.worker:Reserved job 42
2014-11-17 01:21:00,067.067 INFO:teuthology.worker:Config is:
machine_type: container
name: foo
os_type: ubuntu
os_version: '14.04'
overrides:
  install:
    ceph: {branch: firefly}
owner: loic@dachary.org
priority: 1000
roles:
- [mon.a, osd.0, osd.1, client.0]
tasks:
- {install: null}
tube: container
verbose: false

Fetching from upstream into /home/loic/src/ceph-qa-suite_master
...
completed on container001: sudo lsb_release '-is':  Ubuntu
reusing existing image ceph-base-ubuntu-14.04-firefly
running 'docker' 'stop' 'container001'
completed ('docker', 'stop', u'container001') on container001:  container001
...
2014-11-17 01:21:31,677.677 INFO:teuthology.run:Summary data:
{duration: 14, flavor: basic, success: true}
2014-11-17 01:21:31,677.677 INFO:teuthology.run:pass


The install_packages of the install.py task detects when the remote is a container:

if hasattr(remote, 'type') and remote.type == 'container':

and instead of installing the packages in parallel on all the remotes, it checks for the existence of a docker image that has the name of the branch of the Ceph packages to be installed (it should probably be the hash commit id instead):

remote.commit_name = config['branch']
if remote.image_exists():

If such an image does not exist, it installs the packages and create the image.

f = install_pkgs[system_type]
f(ctx, remote, pkgs[system_type], config)
remote.commit(config['branch'])

It then stops all the remotes (i.e. all the containers). When a command is send to run on the remote, it will start a docker container based on the image containing the package installed instead of the one that only contains the base operating system.

for remote in ctx.cluster.remotes.iterkeys():
remote.commit_name = config['branch']
remote.stop()

The code does not show that it starts because it happens implicitly when the first command is run.

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