[Openstack-operators] [kolla][puppet][openstack-ansible][tripleo] Better way to run wsgi service.

Mohammed Naser mnaser at vexxhost.com
Thu Aug 24 16:29:27 UTC 2017

On Thu, Aug 24, 2017 at 11:15 AM, Jeffrey Zhang <zhang.lei.fly at gmail.com> wrote:
> We are moving to deploy service via WSGI[0].
> There are two recommended ways.
> - apache + mod_wsgi
> - nginx + uwsgi
> later one is more better.
> For traditional deployment, it is easy to implement. Use one
> uwsgi progress to launch all wsgi services ( nova-api,cinder-api , etc).
> Then one nginx process to forward the http require into uwsgi server.
> But kolla is running one process in one container. If we use
> the recommended solution, we have to use two container to run
> nova-api container. and it will generate lots of containers.
> like: nginx-nova-api, uwsig-nova-api.
> i propose use uwsgi native http mode[1]. Then one uwsgi
> container is enough to run nova-api service. Base one the official
> doc, if there is no static resource, uWSGI is recommended to use
> as a real http server.
> So how about this?

I think this is an interesting approach.  At the moment, the Puppet
modules currently allow deploying for services using mod_wsgi.
Personally, I don't think that relying on the HTTP support of uWSGI is
very favorable.   It is quite difficult to configure and 'get right'
and it leaves a lot to be desired (for example, federated auth relies
on Apache modules which would make this nearly impossible).

Given that the current OpenStack testing infrastructure proxies to
UWSGI, I think it would be best if that approach is taken.  This way,
a container (or whatever service) would expose a UWSGI API, which you
can connect whichever web server that you need.

In the case of Kolla, the `httpd` container would be similar to what
the `haproxy` is.  In the case of Puppet, I can imagine this being
something to be managed by the user (with some helpers in there).  I
think it would be interesting to add the tripleo folks on their
opinion here as consumers of the Puppet modules.

> [0] https://governance.openstack.org/tc/goals/pike/deploy-api-in-wsgi.html
> [1]
> http://uwsgi-docs.readthedocs.io/en/latest/HTTP.html#can-i-use-uwsgi-s-http-capabilities-in-production
> --
> Regards,
> Jeffrey Zhang
> Blog: http://xcodest.me
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