[syslog-ng] prevent duplicate messages in logs

Balazs Scheidler bazsi77 at gmail.com
Mon Jul 23 21:27:50 CEST 2012

The best solution would be to use embedded log statements to take care
for local logging, then the top-most rule can be marked as final.


On Mon, Jul 23, 2012 at 9:31 AM, Sergey Naumov <sknaumov at gmail.com> wrote:
> 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
> name)?
> 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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