[syslog-ng] prevent duplicate messages in logs

Sergey Naumov sknaumov at gmail.com
Mon Jul 23 09:31:00 CEST 2012

It seems that a way to prevent duplicates is to save LogDestGroup
pointers or names (to which message was already logged) into
LogMessage struct. Then groupfinal flag can be introduced to prevent
message to be logged twice to the same LogDestGroup. Are LogDestGroup
pointers unique (one to one match between pointer value and group

Thanks in advance,
Sergey Naumov.

2012/7/23, Sergey Naumov <sknaumov at gmail.com>:
> Hello.
> I would like to ask what mechanism syslog-ng provides to prevent
> duplicate messages in a log. In most common scenarios I can use
> "final" flag, for example, when I want only logging on a local machine
> (so when I have a single destination). But imagine, that user can
> specify any combination of facilities/priorities and destinations, for
> example, user want to log auth/>=info and all/>=notice to local
> machine and auth/>=debug to remote. Then I have a problem: I can't use
> "final" flag for these entries, because some messages (say
> auth/>=info) will not be logged to remote host, but only auth/debug,
> and if I don't use final flag, there will be duplicates of all
> auth/>=notice messages in the local log. Is there a way to solve this
> problem in general?
> One way is to make a separate log entry for each facility/priority
> combination and group all destinations there, but it won't work if
> user specify some additional custom filters.
> Thanks in advance,
> Sergey Naumov.

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