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Lazylabs
Asked: 2012-05-09 04:27:21 +0800 CST

daemontools: How to find out what is wrong?

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I'm exploring daemontools to run some of our applications, which generate some output as well (on both stdout and stderr).

I installed daemontools on a debian box. Every time, I do a svc -u /etc/service/myservice to start the service, I get a [defunct] process. How can I go about debugging this problem.

Following is my /etc/service/myservice/run:

#!/bin/bash
exec myservice -c /etc/myservice/myservice.conf

and /etc/service/myservice/log/run

#!/bin/sh
exec multilog t ./main

Any help would be apppreciated. Thanks.

debian daemontools

2 Answers

  1. Best Answer

    You can catch some errors with ps -aux | grep readproctitle.

    Some debugging ideas:

    • myserver is not in the PATH. Consider specifying the full path to the program.
    • myserver forks into background: This is explicitly forbidden with services started using daemontools.
    • Permissions: Double-check the permissions of the directories and of the run script.
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  2. I faced the same issue. When nothing else worked, this worked for me :

    • Find the pid of svscanboot through ps auxf. You will see that it starts svscan which monitors all the services.
    • kill -9 -pid.

    svscanboot will start automatically and so will all services under svscan.

    I faced the issue when named pipe of svcan gets corrupt when no disk space is left on machine.

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