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Tutorial to run Python script via systemd

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Nivratti/python-systemd

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README.md

Tutorial to run Python script via systemd

Systemd Service file location and management

• Write Service file
• place your service files inside /etc/systemd/system/ folder
• reload services using systemctl daemon-reload
• after that you are able to perform operations such as
  • systemctl start name.service
  • systemctl status name.service
  • systemctl stop name.service
  • systemctl restart name.service

  [Unit] # service description Description=**Enter Service Description** After=syslog.target [Service] Type=simple # user and group -- to run service User=**Enter username** Group=**Enter groupname** # project working directory WorkingDirectory=/path/to/working/dir/ # Command to execute when the service is started ExecStart=/usr/bin/python /path/to/python/demo_script.py # Automatically restart the service if it crashes Restart=on-failure # set Python's buffering of STDOUT and STDERR value to systemd, so that output from the # service shows up immediately in systemd's logs StandardOutput=syslog StandardError=syslog [Install] # Tell systemd to automatically start this service when the system boots # (assuming the service is enabled) WantedBy=multi-user.target 

  [Unit] # service description Description=Python Demo After=syslog.target [Service] Type=simple # user and group -- to run service User=nivratti Group=nivratti # project working directory WorkingDirectory=/programming/python/projects/ # Command to execute when the service is started ExecStart=/usr/bin/python /programming/python/projects/python-demo.py # Automatically restart the service if it crashes Restart=on-failure # set Python's buffering of STDOUT and STDERR value to systemd, so that output from the # service shows up immediately in systemd's logs StandardOutput=syslog StandardError=syslog [Install] # Tell systemd to automatically start this service when the system boots # (assuming the service is enabled) WantedBy=multi-user.target 

  Imp — Specify python interpreter

  Specify Python interpreter

  ExecStart=/usr/bin/python /file/path/python_demo_script.py 

  Service file configuration details

  Источник

  How to stop and start a systemd service via python script w/o requiring sudo password

  The following script allows me to check whether a systemd service is active, and to stop or start the service. When executing .stop() or .start() , how can I proceed to stopping and starting the service directly w/o having to supply the sudo password? An example application of where this is useful is stopping and restarting the NetworkManager service.

  #!/bin/python3 import subprocess import sys class SystemdService(object): '''A systemd service object with methods to check it's activity, and to stop() and start() it.''' def __init__(self, service): self.service = service def is_active(self): """Return True if systemd service is running""" try: cmd = '/bin/systemctl status <>.service'.format(self.service) completed = subprocess.run( cmd, shell=True, check=True, stdout=subprocess.PIPE ) except subprocess.CalledProcessError as err: print( 'ERROR:', err ) else: for line in completed.stdout.decode('utf-8').splitlines(): if 'Active:' in line: if '(running)' in line: print('True') return True return False def stop(self): ''' Stop systemd service.''' try: cmd = '/bin/systemctl stop <>.service'.format(self.service) completed = subprocess.run( cmd, shell=True, check=True, stdout=subprocess.PIPE ) except subprocess.CalledProcessError as err: print( 'ERROR:', err ) def start(self): ''' Start systemd service.''' try: cmd = '/bin/systemctl start <>.service'.format(self.service) completed = subprocess.run( cmd, shell=True, check=True, stdout=subprocess.PIPE ) except subprocess.CalledProcessError as err: print( 'ERROR:', err ) if __name__ == '__main__': monitor = SystemdService(sys.argv[1]) monitor.is_active() 

  Источник