Hongbin Lu 7aba2d5f8a Switch from mode_wsgi to uwsgi

When the wsgi community goal was first approved, the push was to
use mod_wsgi. mod_wsgi has many issues when being used in devstack
for development or testing (see [1]). This commit will switch the
deployment of zun-api to uwsgi.

[1] https://governance.openstack.org/tc/goals/pike/deploy-api-in-wsgi
    .html#uwsgi-vs-mod-wsgi

Change-Id: Iec05ccb8aceee6874e3c04280fe7596f8292e333
Closes-Bug: #1692382

2017-08-07 17:07:46 +00:00

3.2 KiB

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Installing the API via WSGI

This document provides two WSGI deployments as examples: uwsgi and mod_wsgi.

https://governance.openstack.org/tc/goals/pike/deploy-api-in-wsgi.html#uwsgi-vs-mod-wsgi

Installing the API behind mod_wsgi

Zun comes with a few example files for configuring the API service to run behind Apache with mod_wsgi.

app.wsgi

The file zun/api/app.wsgi sets up the V2 API WSGI application. The file is installed with the rest of the zun application code, and should not need to be modified.

etc/apache2/zun.conf

The etc/apache2/zun.conf file contains example settings that work with a copy of zun installed via devstack.

../../../etc/apache2/zun.conf.template

On deb-based systems copy or symlink the file to /etc/apache2/sites-available. For rpm-based systems the file will go in /etc/httpd/conf.d.
Modify the WSGIDaemonProcess directive to set the user and group values to an appropriate user on your server. In many installations zun will be correct. Modify the WSGIScriptAlias directive to set the path of the wsgi script. If you are using devstack, the value should be /opt/stack/zun/zun/api/app.wsgi. In the ErrorLog and CustomLog directives, replace %APACHE_NAME% with apache2.
Enable the zun site. On deb-based systems:
```
$ a2ensite zun
$ service apache2 reload
```
On rpm-based systems:
```
$ service httpd reload
```

Installing the API with uwsgi

Create zun-uwsgi.ini file:

[uwsgi]
http = 0.0.0.0:9517
wsgi-file = <path_to_zun>/zun/api/app.wsgi
plugins = python
# This is running standalone
master = true
# Set die-on-term & exit-on-reload so that uwsgi shuts down
exit-on-reload = true
die-on-term = true
# uwsgi recommends this to prevent thundering herd on accept.
thunder-lock = true
# Override the default size for headers from the 4k default. (mainly for keystone token)
buffer-size = 65535
enable-threads = true
# Set the number of threads usually with the returns of command nproc
threads = 8
# Make sure the client doesn’t try to re-use the connection.
add-header = Connection: close
# Set uid and gip to a appropriate user on your server. In many
# installations ``zun`` will be correct.
uid = zun
gid = zun

Then start the uwsgi server:

uwsgi ./zun-uwsgi.ini

Or start in background with:

uwsgi -d ./zun-uwsgi.ini

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