Gunicorn¶
Gunicorn is a Python WSGI HTTP Server for UNIX. The Gunicorn server is light on server resources, and fairly speedy.
If you find Apache’s mod_wsgi to be a headache or want to use NGINX (or some other webserver), then Gunicorn could be for you. There are a number of other WSGI server options out there and this documentation should be enough for you to piece together how to get them working with your environment.
Check out the full Gunicorn docs.
Setting up Gunicorn¶
Note
If you’re using a virtual environment, activate it now. source /path/to/venv/bin/activate.
Install Gunicorn using pip, pip install gunicorn.
In your myauth base directory, try running gunicorn --bind 0.0.0.0:8000 myauth.wsgi. You should be able to browse to http://yourserver:8000 and see your Alliance Auth installation running. Images and styling will be missing, but don’t worry, your web server will provide them.
Once you validate its running, you can kill the process with Ctrl+C and continue.
Running Gunicorn with Supervisor¶
You should use Supervisor to keep all of Alliance Auth components running (instead of using screen). You don’t have to but we will be using it to start and run Gunicorn so you might as well.
Sample Supervisor config¶
You’ll want to edit /etc/supervisor/conf.d/myauth_gunicorn.conf (or whatever you want to call the config file)
[program:myauth-gunicorn]
user = allianceserver
directory=/home/allianceserver/myauth/
command=gunicorn myauth.wsgi --workers=3 --timeout 120
autostart=true
autorestart=true
stopsignal=INT
[program:myauth-gunicorn]- Change myauth-gunicorn to whatever you wish to call your process in Supervisor.user = allianceserver- Change to whatever user you wish Gunicorn to run as. You could even set this as allianceserver if you wished. I’ll leave the question security of that up to you.directory=/home/allianceserver/myauth/- Needs to be the path to your Alliance Auth project.command=gunicorn myauth.wsgi --workers=3 --timeout 120- Running Gunicorn and the options to launch with. This is where you have some decisions to make, we’ll continue below.
Gunicorn Arguments¶
See the Commonly Used Arguments or Full list of settings for more information.
Where to bind Gunicorn to?¶
What address are you going to use to reference it? By default, without a bind parameter, Gunicorn will bind to 127.0.0.1:8000. This might be fine for your application. If it clashes with another application running on that port you will need to change it. I would suggest using UNIX sockets too, if you can.
For UNIX sockets add --bind=unix:/run/allianceauth.sock (or to a path you wish to use). Remember that your web server will need to be able to access this socket file.
For a TCP address add --bind=127.0.0.1:8001 (or to the address/port you wish to use, but I would strongly advise against binding it to an external address).
Whatever you decide to use, remember it because we’ll need it when configuring your webserver.
Number of workers¶
By default Gunicorn will spawn only one worker. The number you set this to will depend on your own server environment, how many visitors you have etc. Gunicorn suggests between 2-4 workers per core. Really you could probably get away with 2-4 in total for most installs.
Change it by adding --workers=2 to the command.
Running with a virtual environment¶
If you’re running with a virtual environment, you’ll need to add the path to the command= config line.
e.g. command=/path/to/venv/bin/gunicorn myauth.wsgi
Starting via Supervisor¶
Once you have your configuration all sorted, you will need to reload your supervisor config service supervisor reload and then you can start the Gunicorn server via supervisorctl start aauth-gunicorn (or whatever you renamed it to). You should see something like the following aauth-gunicorn: started. If you get some other message, you’ll need to consult the Supervisor log files, usually found in /var/log/supervisor/.
Configuring your webserver¶
Any web server capable of proxy passing should be able to sit in front of Gunicorn. Consult their documentation armed with your --bind= address and you should be able to find how to do it relatively easy.
Restarting Gunicorn¶
In the past when you made changes you restarted the entire Apache server. This is no longer required. When you update or make configuration changes that ask you to restart Apache, instead you can just restart Gunicorn:
supervisorctl restart myauth-gunicorn, or the service name you chose for it.