[syslog-ng] syslog-ng 3.3.7 DNS resolving Problem

Daniel Neubacher daniel.neubacher at xing.com
Wed Jan 2 13:40:55 CET 2013

Hello there,
I've got a little trouble with  the DNS resolving of syslog-ng. Last week I patched my syslog installation with the threaded dns bugfix (https://bugzilla.balabit.com/show_bug.cgi?id=212) and it seems like most of my problems are gone but one is still remaining.

Many times a day messages are sorted into a folder with the DNS name of my syslog-ng server instead of the real host where the log is coming from.  The log line still has the right host in the text and most of the time it is working but I could not find any way to reproduce the problem on demand yet. For debugging I've disabled any logging for the server itself but it still happens.

My destinations are configured like this:
destination d_syslog { file("/log/syslog/${R_YEAR}/${R_MONTH}/${R_DAY}/$FULLHOST_FROM/$PROGRAM" template(t_plain)); };

And my dns options:

I've tried disabling the syslog-ng cache,installing a local caching bind and after that a nscd but with no success. With 750 servers sending 30k-40k logs per second the dns querys are too expensive and I need the internal syslog-ng caching. With local bind caching the logs per second are dropping down to 2500.

Does anybody has an idea to fix this?

Daniel Neubacher, Network Administrator
daniel.neubacher at xing.com<mailto:daniel.neubacher at xing.com>

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