UnixStreamServer(Unix domain socket) Solution

1. Put logging program to right location

/opt/daemon/service/secu_unix_stream_logging.py

2. Define the systemd service unit

~/.config/systemd/user/secu_logging.service

[Unit]
Description=secu_logging service

[Service]
Type=simple
Restart=on-failure
RestartSec=3
TimeoutStopSec=20
ExecStart=/usr/bin/python3 /opt/daemon/service/secu_unix_stream_logging.py

[Install]
WantedBy=multi-user.target

• auto start when system start-up, replace [Install] section by following
  • WantedBy=default.target

3. Start Logging Service

systemctl --user daemon-reload
systemctl --user start secu_logging.service

if you want to make your service auto start-up when system boot

systemctl --user enable secu_logging.service

4. Check status

systemctl --user status secu_logging.service

5. Stop service

systemctl --user stop secu_logging.service

TCP Server Solution

1. Put logging program to right location

/opt/daemon/service/secu_logging.py

2. Define the systemd service unit

~/.config/systemd/user/secu_logging.service

[Unit]
Description=secu_logging service
After=network.target secu_logging.socket
Requires=secu_logging.socket

[Service]
Type=simple
Restart=on-failure
RestartSec=3
TimeoutStopSec=20
ExecStart=/usr/bin/python3 /opt/daemon/service/secu_logging.py

[Install]
WantedBy=multi-user.target

• auto start when system start-up, replace [Install] section by following
  • WantedBy=default.target

3. Define the systemd socket unit

~/.config/systemd/user/secu_logging.socket

[Unit]
Description=Logging Socket
PartOf=secu_logging.service

[Socket]
ListenStream=127.0.0.1:9020

[Install]
WantedBy=sockets.target

4. Check status

systemctl --user status secu_logging.socket

5. Stop service

systemctl --user stop secu_logging.socket

6. Start Listening Socket

systemctl --user daemon-reload
systemctl --user start secu_logging.socket

if you want to make your service auto start-up when system boot

systemctl --user enable secu_logging.service

Check service received messages

journalctl

journalctl -f --user-unit secu_logging.service

Reference

• systemd/User@archlinux
• README-python-service-on-systemd-activated-socket@GitHubGist