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I'm looking into different services that help keep processes up and running (auto-restart in the event of a crash). Which ones do you prefer and what are your commends/suggestions? Here are a few methods I've found:

  1. respawn in /etc/inittab
  2. supervise with daemontools
  3. runit
  4. upstart
  5. monit

Personally, I had a bad experience with monit not properly respawning processes so I have to recommend against it. I'm currently using daemontools and it's working quite well so far.

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3 Answers

daemontools is indeed well proven; the license isn't even problematic anymore, I don't think.

And its FAQ compares it to inittab, which you asked about.

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launchd solves this problem and many more. According to the wikipedia article:

The launchd daemon is essentially a replacement for init, rc, the init.d and rc.d scripts, SystemStarter (Mac OS X), inetd and xinetd, atd, crond and watchdogd.

It's prolific in the mac world, but it is open source and there's no reason you can't use it in linux. Ubuntu considered using it but the license was incompatible at the time (it has since been changed to the Apache license).

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Quagga routing suite has watchquagga, which is tailored to that suite's needs. Not sure if it can be used with any generic daemon.

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