[openstack-dev] [Fuel] Rewriting nailgun agent on Python proposal

Evgeniy L eli at mirantis.com
Mon Mar 14 16:41:00 UTC 2016

Hi Alexander, thanks for bringing this up.

>From your list of problems the only problem which I see is 1st, 2nd and 3rd
are solvable even with current implementation.

Also I don't think that we should continue developing our own HW discovery
mechanism, we should consider switching to ironic-inspector, and get common
discovery system [0]. We need to evaluate it and get a list of features
which we may need from it and discuss with ironic team.


[0] https://github.com/openstack/ironic-inspector

On Mon, Mar 14, 2016 at 6:13 PM, Alexander Saprykin <asaprykin at mirantis.com>

> Hi,
> We have fuel-nailgun-agent project which was initially written on Ruby. It
> is 900 lines of code single script, that collects and provides to the
> nailgun information about node's hardware.
> In the past several iteration we had to introduce new modifications to
> that script we discovered couple of major problems with it.
> 1. Most of our software engineers are Python programmers and it's quite
> complicated to add new features. We have or to write ugly ruby code or to
> wait for somebody who knows it to write it.
> 2. Nailgun agent doesn't have tests. At all.
> 3. It would be good to have a plugins support in the nailgun agent. In
> case if customer wants to collect any extra information about nodes that
> can be used in fuel plugins.
> Possible obstacles:
> Nailgun agent depends from Ruby library called *ohai* which provides
> hardware information.
> Our proposal is to:
> 1. Rewrite fuel nailgun agent to Python.
> 2. Add proper unit tests.
> 3. Ohai library can be used as CLI tool or it can be replaced with pure
> python solution (to be investigated)
> 4. Nailgun agent can be extended with plugins based on steevedore.
> Best regards,
> Alexander Saprykin
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