[Pdns-users] recursor and HUP

Peter van Dijk peter.van.dijk at netherlabs.nl
Thu Dec 27 17:50:25 UTC 2012

Hello Charles,

On Dec 26, 2012, at 5:38 , Charles Sprickman wrote:

> I'm not seeing anything in the documentation about what sending a HUP should do to the recursor, but here I'm seeing it kill the process.
> It gets a bit stranger than that though…  We had a log rotation rule setup that was sending the recursor a HUP at midnight.  This was unneeded since syslog is how pdns logs, so I'm not sure why we even had that there.  That said, two identical boxes (same hardware, OS+version, same build of the same recursor pkg) were acting differently.  The one that died on a HUP was where I was originally fiddling with controlsocket owner/location/mode, the one that did not die on a HUP was untouched, just running with defaults.
> Removing the socket after stopping the recursor and letting it set perms itself resulted in mode 700 and both now die on a HUP.  However trying 750 and 755 is not "fixing" it.  I'm suspicious of the socket owner/perms only because that's the only thing I know was originally different between the two boxes.  Setting "trace=on" in the config file gives me no further information.  In both cases the recursor just exits without logging anything.

The recursor does absolutely nothing about HUP - which means you should get the default action, which is terminate. So, the interesting part here is one of your recursors *not* dying!

Kind regards,
Peter van Dijk
Netherlabs Computer Consulting BV - http://www.netherlabs.nl/

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