[syslog-ng]Full pipe as destination

[Peter Draexler]

Dear Bazsi,
thank you for your info. This should help.
Nevertheless, does syslog-ng log somewhere if it discards events or do you know
another way to check this?
This would be important to adapt log_fifo_size. Currently we only observe by
chance that we lost information.
Best regards                          Peter

Balazs Scheidler schrieb:

> On Tue, Aug 14, 2001 at 08:45:35AM +0200, Peter Draexler wrote:
> > Hi,
> >
> > We are using syslog-ng on our logserver with multifunctional
> > logforwarding.
> > As a special type of destination we are using pipes as a special
> > interface to commercial applications.
> >
> > Here is our question:
> >     What happens with the log events, if the pipe becomes
> >     temp. unavailable (e.g. the reading end is dead or
> >     the pipe is full)?
> >
> > IMHO you have to open() the pipe nonblocking, to avoid your
> > syslog stucks in-active, in the case one destination is broken.
> > I think this is true. Correct?
>
> it's true.
>
> >
> > What happens with your internal log buffers, if write() returns -1
> > and errno set to EAGAIN?
> > You implement an internal buffering/queue and try to write the
> > outstanding log events some times later or you simply discard
> > the buffers as long as one destination is unreachable?
>
> messages are queued up to the value of log_fifo_size, which IIRC can be set
> on a per-destination basis. if the fifo is full, messages are discarded.
>
> >
> > A Hint for syslog-ng.1.5.8 on Solaris 8:
> >     $DATE in destination templates returns nothing.
> >     But $FULL|ISODATE works fine.
>
> this seems to be fixed in my CVS tree, though it's not yet released.
>
> --
> Bazsi
> PGP info: KeyID 9AF8D0A9 Fingerprint CD27 CFB0 802C 0944 9CFD 804E C82C 8EB1
>
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--
Dr. Peter Dräxler
mediaWays GmbH
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