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As written in the title, where should I let the init script write the pid file? are there any standard paths I should choose instead of the /var/run?

Could /tmp be a good place where to store it or there are drawbacks in that?

(Historical context: in modern distributions /var/run is now a symbolic link to /var but my question is the same.)

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    Whats wrong with /var/run?
    – arved
    Jul 27, 2012 at 16:27
  • This Stack Overflow question is relevant: stackoverflow.com/q/5173636/1071869
    – Renan
    Jul 27, 2012 at 16:38
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    the only wrong thing with /var/run is that I do not have write access with my user to it..
    – Murko
    Jul 27, 2012 at 17:38
  • 2
    @Murko then you should store the pid file in the user's home directory.
    – Renan
    Jul 27, 2012 at 17:44

2 Answers 2

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In short: you could store it anywhere (say, /tmp or /var/tmp), but /var/run is the preferred standard.

/var/run is the Filesystem Hierarchy Standard:

This directory contains system information data describing the system since it was booted. Files under this directory must be cleared (removed or truncated as appropriate) at the beginning of the boot process. Programs may have a subdirectory of /var/run; this is encouraged for programs that use more than one run-time file.[footnote 37]

And a desirable feature is that most distros clean it automatically (unlike /tmp which is not cleaned upon boot in some distros) - this avoid stale pid files:

The normal location for pidfiles is /var/run. Most unices will clean this directory on boot; under Ubuntu this is achieved by /var/run an in-memory filesystem (tmpfs).

It's your choice where to store it, but I would go with the standard.

If you don't have access to /var/run, you should store the pid file in the user's home directory, e.g. ~/.my_app.pid.

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If it's non-root write access to /var/run that you need, then note that there are subdirectories in /var/run/user for individual users. You just need to get the UID of the current user:

/var/run/user/[$uid]

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