Deploying owl

Here I am considering launching an application on a server using uWSGI. You can choose any other WSGI server.

The principle of the owl deployment is no different from the deployment of a typical Flask application. See Flask docs: Deployment Options.

Install web-server

uWSGI will run from a virtualenv and be supported by a supervisor. nginx will be used as a reverse proxy.

sudo apt install -y nginx supervisor gcc

source /path/to/virtualenv/bin/activate
pip install uwsgi

uWSGI config

Save as uwsgi.ini:

[uwsgi]
master = true
strict = true
vacuum = true
enable-threads = true
single-interpreter = true
processes = 4
threads = 2
die-on-term = true

# Logging settings
logger = file:logfile=/tmp/uwsgi.log,maxsize=2000000

# UNIX-socket
socket = /tmp/uwsgi.sock
chmod-socket = 666

chdir = /path/to/owl
module = wsgi
callable = app

Don't forget add www-data to your user's group:

usermod -a -G USERGROUP www-data

nginx virtual host config

Replace example.org with your domain and set correct paths:

server {
        listen 80;
        #listen 443 ssl http2;

        root /path/to/site/;

        server_name example.org www.example.org;

        # Let's Encrypt SSL certifcate
        #ssl_certificate /etc/letsencrypt/live/example.org/fullchain.pem;
        #ssl_certificate_key /etc/letsencrypt/live/example.org/privkey.pem;

        # Redirect to HTTPS
        #if ($scheme != "https") {
        #        return 301 https://$host$request_uri;
        #}

        # Base Auth
        #location / {
        #        auth_basic "Authentication required";
        #        auth_basic_user_file /var/www/example.org/.htpasswd;
        #}

        location / {
                # uWSGI proxy
                include uwsgi_params;
                uwsgi_pass unix:/tmp/uwsgi.sock;
        }

        location ~* \.(css|js|jpg|jpeg|png|gif|woff|ttf)$ {
                expires 1M;
                add_header Cache-Control public;
        }
}

run_uwsgi.sh

This script will be activate virtualenv and run uWSGI with their config file.

#!/bin/bash

source /path/to/virtualenv/bin/activate
uwsgi --ini /path/to/uwsgi.ini

supervisor config

Place file at /etc/supervisor/conf.d/ with .conf extension. Replace USER to your username.

[program:example.org.uwsgi]
command = /path/to/run_uwsgi.sh
user = USER
process_name = %(program_name)s
numprocs = 1
autostart = true
autorestart = true
stopsignal = QUIT

Run

service nginx restart
service supervisor restart

owl

Contents

owl