SZÉPE Viktor writes:
Hello! I am just experiencing with systemd. I've noticed that courierd - the sending daemon - does not have a pid file, that is why it cannot be monitored and restarted on failure. (How is it possible to stop it at all? Through its FIFO?)
Yes, the FIFO is used to send commands to the running daemon, not just to stop it.
There's a popular meme that says that if a process stops abnormally, all you have to do is restart it, and this solves the problem.
Of course, that does nothing to solve the problem which caused the process to stop in the first place.
A much better approach is simply to make sure that the software is robust enough so that it doesn't stop running, for some reason, in the first place. In which case, it does not need any silly pid file, for some nebulous monitoring purpose.
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