Clark Boylan 1d38440e18 Make multinode first class with ansible ...

Use ansible to get work done in parallel because we want to make
devstack-gate treat multinode testing as a first class citizen.

Note that this is just a first iteration that covers the largest time
costs in multinode setup. It runs host and workspace setup in parallel
as well as running devstack setup in parallel. Some portions of
multinode setup like the network overlay configuration is not yet done
in ansible, but doing that in parallel is less pressing as the cost is
much lower.

This does also try to establish some conventions around using ansible in
d-g. Control flow logic should remain in bash with d-g. All shell
variables should be interpolated into the ansible command strings before
running ansible (do not pass through to the remote side), this keeps
commands simple and avoids surprises with values being picked up
differently on the remote side. This may have to change over time as we
use ansible more, but for now this seems to work well.

Follow up changes should look at using ansible playbook for colocated
ansible commands. We should also convert more of the cross node setup
into ansible.

Change-Id: I34cec44281eadfbfb990ed8ed160ee7dec50341b

2015-04-23 11:43:45 -07:00

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