Hi Sam
Am 10.05.2006 um 23:31 schrieb Sam Varshavchik:
We are using courier-0.47 on Debian sarge.
Actually, this is a prehistoric version of Courier where this is
still possible, but nobody really cares about spending time on this
ancient dinosaur any more; and, in any case, you will need to
recompile it.
Ok. We compiled courier-0.53.1 and courier-authlib-0.58. Great job.
What a pleasure to debug this version with much better debug and
error statements.
By debugging the stacktrace of courierauthtest we found exactly
the missing requets. They all produced:
connect(3, {sa_family=AF_FILE, path="/var/run/courier/authdaemon/
socket"}, 110) = -1 EAGAIN (Resource temporarily unavailable)
You have exceeded the maximum limits of your kernel configuration.
Well, we increased the local port range but the errors are still
there (it did not even get worser when I decreased the range):
"ERR: authdaemon: s_connect() failed: Resource temporarily unavailable"
So am I right that all imap and pop daemons communicate through one
single UNIX Socket with the authdaemon processes? If we increase the
number of authdaemons, we can read faster from the socket and it is
free for more imap/pop daemons to connect and write.
Increasing the number of authdaemons only helps until a certain
critical number has reached (as you mentioned with the kernel
configuration), but we still do not know what.
We already tried a little workaround by modifing the code of the
function s_connect in authdaemonlib.c by adding a sleep loop.
If we get a EAGAIN error, the daemon will sleep for short period and
then tries x-times to connect to the socket again.
We still got some failures but there are less of them. Of course, the
authentication time was sometimes longer than normal but it did not
interrupted the login procedure (and ask for passwords again and
again). But I think this is not the standard procedure to solve this
problem and maybe there are more sideeffects. What do you think?
Does anyone has an experience what are acceptable values MAXDAEMONS
of imap, MAXDAEMONS of pop and MAXDAEMONS of authdaemond?
We are currently starting 200 IMAP and 200 POP daemons and are
running 15 Authdaemons. What kind of configuration is used successfully?
Thanks and kind regards,
Norbert
- --
_____________________________
University of Berne
IT-Services Departement
Norbert Kottmann
Gesellschaftsstrasse 6
CH-3012 Bern
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