Bind 8.2.1 stability problem!

Roberto Turriziani r.turriziani at gmx.ch
Sun Jul 11 22:03:57 UTC 1999


Hello!

Recently we changed our DNS-Servers from
    SparcStation-5 96 MB 100MBit-half switched
    SUN/Solaris 2.5
    Bind 8.1.2
to
    HP LPr Pentium 450MHz 256MB 100MBit-full switched
    RedHat 6.0 Kernel 2.2.10
    Bind 8.2.1
to achive better performance for the about 4500 zones we host.

But instead of better performance, we ran into troubles:

Sometimes bind on our primary server seems to hang. In debugging mode
the incoming requests are logged, but the daemon doesn't answer
anything. After a while (between 1 and 5 minutes) it recovers and starts
to answer queries again. In the logfile suddenly appears a bunch of the
following messages:

Jul  8 13:31:17 dns1 named[5787]: ns_req: sendto([195.96.9.246].1149):
Connection refused
[a lot of messages deleted, depending of the duration of the breakdown]
Jul  8 13:31:18 dns1 named[5787]: ns_req: sendto([195.96.0.93].56663):
Connection refused

But sometimes it doesn't recover. It hangs for more than 10 minutes.
When it hangs it ignores all messages form ndc, so I've to stop and
start bind. During stopping it again logs the former described messages.
The higher the load on the server is the more likely is the occurence of
the problem.

There's a second problem, that occurs when  I try to reload the server;
it hangs suddenly and never logs a line. The only solution is to stop
and start bind.

At the first sight, it seems to be a network problem, but I've  already
checked the network connectivity. It's okay. The memory consumption of
bind shouldn't be a problem, it uses about 40 MBytes. There's no other
service running on the same machine, that could influence bind. The
processor is more than 90% idle. In the logfiles I've found no
explanation about the behavior.

Any ideas?

Kind regards + Ciao,
Roberto Turriziani

--
Roberto Turriziani
r.turriziani at gmx.ch





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