Installing Neutron API via WSGI

Installing Neutron API via WSGI

This document is a guide to deploying neutron using WSGI. There are two ways to deploy using WSGI: uwsgi and Apache mod_wsgi.

Please note that if you intend to use mode uwsgi, you should install the mode_proxy_uwsgi module. For example on deb-based system:

# sudo apt-get install libapache2-mod-proxy-uwsgi
# sudo a2enmod proxy
# sudo a2enmod proxy_uwsgi

WSGI Application

The function neutron.server.get_application will setup a WSGI application to run behind uwsgi and mod_wsgi.

Neutron API behind uwsgi

Create a /etc/neutron/neutron-api-uwsgi.ini file with the content below:

chmod-socket = 666
socket = /var/run/uwsgi/neutron-api.socket
lazy-apps = true
add-header = Connection: close
buffer-size = 65535
hook-master-start = unix_signal:15 gracefully_kill_them_all
thunder-lock = true
plugins = python
enable-threads = true
worker-reload-mercy = 90
exit-on-reload = false
die-on-term = true
master = true
processes = 2
wsgi-file = <path-to-neutron-bin-dir>/neutron-api

Start neutron-api:

# uwsgi --procname-prefix neutron-api --ini /etc/neutron/neutron-api-uwsgi.ini

Neutron API behind mod_wsgi

Create /etc/apache2/neutron.conf with content below:

Listen 9696
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-agent}i\" %D(us)" neutron_combined

<Directory /usr/local/bin>
    Require all granted

<VirtualHost *:9696>
    WSGIDaemonProcess neutron-server processes=1 threads=1 user=stack display-name=%{GROUP}
    WSGIProcessGroup neutron-server
    WSGIScriptAlias / <path-to-neutron-bin-dir>/neutron-api
    WSGIApplicationGroup %{GLOBAL}
    WSGIPassAuthorization On
    ErrorLogFormat "%M"
    ErrorLog /var/log/neutron/neutron.log
    CustomLog /var/log/neutron/neutron_access.log neutron_combined

Alias /networking <path-to-neutron-bin-dir>/neutron-api
<Location /networking>
    SetHandler wsgi-script
    Options +ExecCGI
    WSGIProcessGroup neutron-server
    WSGIApplicationGroup %{GLOBAL}
    WSGIPassAuthorization On

WSGISocketPrefix /var/run/apache2

For deb-based systems copy or symlink the file to /etc/apache2/sites-available. Then enable the neutron site:

# a2ensite neutron
# systemctl reload apache2.service

For rpm-based systems copy the file to /etc/httpd/conf.d. Then enable the neutron site:

# systemctl reload httpd.service

Start Neutron RPC server

When Neutron API is served by a web server (like Apache2) it is difficult to start an rpc listener thread. So start the Neutron RPC server process to serve this job:

# /usr/bin/neutron-rpc-server --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/ml2_conf.ini
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