在 systemd 服务中启动时 Python 子进程库失败

Question

I am using the function subprocess.run and subprocess.check_output that works great when I launch my python code. I then create a service in systemd but the process crashes when getting to these functions

From the log journalctl:

Nov 30 19:19:24 srv2 python3[3369]:
   File "/usr/lib/python3.6/subprocess.py", line 423, in run
Nov 30 19:19:24 srv2 python3[3369]:
     with Popen(*popenargs, **kwargs) as process:
Nov 30 19:19:24 srv2 python3[3369]:
   File "/usr/lib/python3.6/subprocess.py", line 729, in __init__
Nov 30 19:19:24 srv2 python3[3369]:
     restore_signals, start_new_session)
Nov 30 19:19:24 srv2 python3[3369]:
   File "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child
Nov 30 19:19:24 srv2 python3[3369]:
     raise child_exception_type(errno_num, err_msg, err_filename)
Nov 30 19:19:24 srv2 python3[3369]:
 FileNotFoundError: [Errno 2] No such file or directory: 'mosquitto_passwd': 'mosquitto_passwd'

Answer 1

For some reason the service goes thru this morning, I added Type=simple and set user to root but not sure if it was the cause

[Unit]
Description=my service
After=network.target

[Service]
Type=simple
User=root
Group=root
Restart=always
WorkingDirectory=/home/python/service
ExecStart=/usr/bin/python3 /home/python/service/main.py

[Install]
WantedBy=multi-user.target