Systemd-Service

Simple API to automate the creation of custom daemons for GNU/Linux.

A daemon is a service process that runs in the background and supervises the system or provides functionality to other processes. Traditionally, daemons are implemented following a scheme originating in SysV Unix. Modern daemons should follow a simpler yet more powerful scheme, as implemented by systemd.

Systemd-Service is a Python module to automate the creation of daemons under GNU/Linux environments.

Install

pip install -U systemd-service

Handle daemons

from systemd_service import Service

daemon = Service("stream_rpyc")

daemon.stop()     # Start (activate) the unit.
daemon.start()    # Stop (deactivate) the unit.
daemon.reload()   # Reload the unit.  
daemon.restart()  # Start or restart the unit.

daemon.enable()   # Enable the unit.
daemon.disable()  # Disable the unit.

daemon.remove()   # Remove the file unit.

This commands are uquivalent to the systemctl calls, for example run in terminal the folowing command: $ systemctl enable stream_rpyc Can be running inside a Python environment with using systemd_service

from systemd_service import Service

daemon = Service("stream_rpyc")
daemon.enable()

Creating services

Similar to the previous scripts, the services can be created using systemd_service:

daemon = Service("stream_rpyc")
daemon.create_service()

If the service must be initialized after other service

daemon = Service("stream_rpyc")
daemon.create_service(after='ntpd')

Creating timers

Defines a timer relative to when the machine was booted up:

daemon = Service("stream_rpyc")
daemon.create_timer(on_boot_sec=15)

Example

This module is useful when is combined with package scripts declaration in setup.py file:

# setup.py

scripts=[
    "cmd/stream_rpyc",
]

The script could looks like:

#!/usr/bin/env python

import sys

if sys.argv[-1] == "systemd":
    from systemd_service import Service
    daemon = Service("stream_rpyc")
    daemon.create_timer(on_boot_sec=10, after='network.target kafka.service')

else:
    from my_module.submodule import my_service
    print("Run 'stream_rpyc systemd' as superuser to create the daemon.")
    my_service()

Then the command can be called as a simple script but with the systemd argument the command will turn into a service.

$ stream_rpyc
# Command executed normally

$ stream_rpyc systemd
# Service created