gate: change ansible to run in virtual environment

[Jesse Pretorius]

Currently gate-check-commit builds an AIO. The AIO bootstraps ansible on the same server that also runs all the playbooks, resulting in the compute and storage roles running on the same host as is used for running ansible.

This introduces some differences to the way things happen in the real world - specifically related to the ansible requirements which are installed on the server. As a result we are possibly missing out on catching some bugs related to differing pip versions or other conflicts introduced by the ansible pip requirements.

I suggest that we install ansible in a seperated python virtual environment to try and isolate this effect.

[Nolan Brubaker (nolan-brubaker)]

Is this suggestion just for AIOs?

Also, how would this affect projects embedding os-ansible-deployment?

[Jesse Pretorius (jesse-pretorius)]

My thinking is that it should be setup within bootstrap-ansible, but default to "no" with an environment variable. The bootstrap-aio should then enable it. This should be used whenever the ansible deployment server is part of the environment, even for the multi-node gate checks.

[Nolan Brubaker (nolan-brubaker)]

So for an actual install, the deployer would execute ansible from within the venv, provided they were using, say, and infra node for they deployment host?

This seems helpful, just trying to clarify impact.

[Jesse Pretorius (jesse-pretorius)]

Yes, that's correct. The ansible bootstrap should, if the option is enabled, install its requirements into the venv and execute from inside it.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Kevin Carter (cloudnull) (<email address hidden>) on branch: master
Review: https://review.openstack.org/304840
Reason: abandoned for https://review.openstack.org/#/c/321036/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/321036
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible/commit/?id=c904de2db512728a4cd479fbd72bb19b432d08f4
Submitter: Jenkins
Branch: master

commit c904de2db512728a4cd479fbd72bb19b432d08f4
Author: Kevin Carter <email address hidden>
Date: Wed May 25 09:49:50 2016 -0500

    Isolate Ansible from the deployment host

    This change allows Ansible to be installed and executed from within
    a virtual environment.

    Closes-Bug: 1431324
    Implements: blueprint ansible-2-1-support
    Change-Id: I2fb19dd8218753f75bd7550ed7ba9b79f777083d
    Signed-off-by: Kevin Carter <email address hidden>

[Thierry Carrez (ttx)]

This issue was fixed in the openstack/openstack-ansible 14.0.0.0b1 development milestone.

[Doug Hellmann (doug-hellmann)]

This issue was fixed in the openstack/openstack-ansible 14.0.0.0b2 development milestone.