Notes about Systemd for webapplications like Django, Flask, Aiohttp

README.md

To create the service file.

sudo vim /etc/systemd/system/webapp.service
sudo systemctl daemon-reload
sudo systemctl enable webapp.service
sudo systemctl start webapp
sudo systemctl restart webapp

If your webapp creates a unix socket, you could fix permissions by using a .path unit observer.

sudo vim /etc/systemd/system/webapp-watch.service
sudo vim /etc/systemd/system/webapp-watch.path
sudo systemctl daemon-reload
sudo systemctl enable webapp-watch.service
sudo systemctl enable webapp-watch.path
sudo systemctl start webapp-watch

A timer that will run an update daily

sudo vim /etc/systemd/system/webapp-update.service
sudo vim /etc/systemd/system/webapp-update.timer
sudo systemctl daemon-reload
sudo systemctl enable webapp-update.service
sudo systemctl enable webapp-update.timer
sudo systemctl start webapp-update

runserver.sh

#!/usr/bin/env bash
set -e

ROOT="$(cd $(dirname "$0") && cd .. && pwd)"
VENV=${ROOT}/.venv

cd ${ROOT}

# Aiottp
${VENV}/bin/python -OO src/manage.py --no-debug runserver --path=/tmp/webapp.socket

# TODO: Flask

# TODO: Django

webapp-update.service

[Unit]
Description = Run updates

[Service]
Type = oneshot
ExecStart = /home/app/webapp/bin/update.sh

[Install]
WantedBy = multi-user.target

webapp-update.timer

[Unit]
Description=Run updates daily

[Timer]
OnCalendar=daily
Persistent=true

[Install]
WantedBy=timers.target

webapp-watch.path

[Unit]
Description = Watch Socket permissions

[Path]
PathChanged = /tmp/webapp.socket

[Install]
WantedBy = multi-user.target

webapp-watch.service

[Unit]
Description = Fix Socket permissions

[Service]
Type = oneshot
ExecStart = /bin/chmod 777 /tmp/webapp.socket

[Install]
WantedBy = multi-user.target

webapp.service

[Unit]
Description=Web application
Before=nginx.service

[Service]
Type=simple
User=app
Group=app
WorkingDirectory=/home/app/webapp
ExecStart=/home/app/webapp/bin/runserver.sh

[Install]
WantedBy=multi-user.target