OSA-deployed uWSGI used by Keystone warns: "!!! no internal routing support, rebuild with pcre support !!!"

[Christian Sarrasin]

Environment
~~~~~~~~~~~
* OSA version: 16.0.2
* Target OS: Ubuntu 16.04 Xenial
* Keystone deployed in containers

Symptom
~~~~~~~
After deploying Keystone without any customizations, the following message appears in the Keystone logs (/var/log/keystone/keystone-wsgi-{admin,public}.log) at KS startup: "!!! no internal routing support, rebuild with pcre support !!!"

Impact
~~~~~~
Not sure what the actual impact of this is; doesn't appear to cause any functional issue; still one wonders if this could have performance implications?

Possible solution
~~~~~~~~~~~~~~~~~
According to https://stackoverflow.com/a/22645915/645016, it might be sufficient to ensure libpcre3-dev is installed on the machine where the uWSGI wheel is being built? This package is indeed missing from the repo containers (libpcre3, the runtime pkg is there).

Note: once uWSGI is built with PCRE support, one might be confronted with this msg in lieu of the above: "pcre jit disabled". According to https://stackoverflow.com/questions/30991198/uwsgi-with-pcre-support#comment50025896_30991198 this is an optimization that's not likely to have a perf. impact...

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/534387

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/534387
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible-repo_build/commit/?id=26bc2218c6dd8e0222f8f63fdd7a2c2a8b7b904e
Submitter: Zuul
Branch: master

commit 26bc2218c6dd8e0222f8f63fdd7a2c2a8b7b904e
Author: Jesse Pretorius <email address hidden>
Date: Tue Jan 16 17:15:50 2018 +0000

    Add pcre-lib for uwsgi

    Building the wheel with PCRE support may improve
    performance, but at the very least gets rid of
    a nasty log message. We prefer our logs not to
    have nasty messages in them, so we add the extra
    package.

    Change-Id: Ibab309445f9398b6f48dc9ea12d89056d14b7a71
    Closes-Bug: #1742538

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/openstack-ansible-repo_build 17.0.0.0b3 development milestone.