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I have an application that writes and reads to an interactive terminal, and when I run it via the shell, it works as expected. However, when I run it as a systemd service, it seems as though the application isn't capturing the stdout or stderr.

I have tried modifying the StandardOutput and StandardError in the service definition to journal+console and tty.

The service section of my systemd file looks like this :

[Service] 
ExecStart=/bin/bash -c "cd /somedir && python3 myapp.py" 
ExecStop= 
Restart=always 
RestartSec=10
StandardOutput=tty 
StandardError=tty

I have also tried setting TTYPath=/dev/tty2, but no luck.

I am running Ubuntu 16.04.

Edit: More info

When I run this app, the interactive session that it creates does not get read from/written to in the terminal where I actually run the app. It emulates its own terminal.

See link here:

http://docs.paramiko.org/en/2.4/api/channel.html#paramiko.channel.Channel.get_pty

and here:

http://docs.paramiko.org/en/2.4/api/channel.html#paramiko.channel.Channel.invoke_shell

Improve this question
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  • 1
    What does systemctl status -l (servicename) show? Commented Feb 11, 2018 at 6:18
  • @ErikF it shows that it's running, are you looking for something specific? Commented Feb 11, 2018 at 7:54
  • I wanted to know whether or not the service had died, so that's helpful. You indicated that the program reads input: does this program require input to start working? If so, are you supplying that input from somewhere? Commented Feb 11, 2018 at 8:09
  • 1
    Maybe you want to first test the tty output with something like ExecStart=/bin/echo "Hello" to exclude problems with the myapp.py application. Just tested on a Ubuntu 16.04 VM and TTYPath=tty2. Saw that the getty@tty2 service is only activated when you switch to it. So defined a dependency [email protected], now it seems to work but the first output of executing the service is not logged. Commented Feb 11, 2018 at 8:59
  • 3
    This answer is relevant: unix.stackexchange.com/questions/339638/… . It seems as though points 3 and 4 of the answer are relevant to this situation. Commented Feb 12, 2018 at 22:14

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