Red Hat Bugzilla – Bug 20970
Stale DNS connections
Last modified: 2007-04-18 12:29:53 EDT
When I do a netstat on my RH 7 box. I receive a listing of many connections to my DNS server. .... udp 0 0 mybox:3236 ns-1.iastate.edu:domain ESTABLISHED udp 0 0 mybox:3235 ns-2.iastate.edu:domain ESTABLISHED udp 0 0 mybox:3234 ns-3.iastate.edu:domain ESTABLISHED .... This listing continues to grow and grow and grow...
Follow-Up: This should be filed under apache. The excessive listing of stale connections disappears once I restart apache. I just installed the latest patches and will try to compile the latest apache version again...
Ok, I am now running hand compiled apache binaries and this 'problem' still occurs. I can make the excessive listing of connections go away by restarting apache.
Out of curiousity: you have 'HostnameLookups On' in your httpd.conf, right? Does this behaviour change if you reverse it?
I do have HostnameLookups On and unfortunately, this machine is a production server, so I hesitate to test this by changing it and ruin the access logs for the time. Honestly, my main fight with the server has been to keep the machine up with a stable kernel, aughhhh... Thanks for the suggestion and I will try it out, but I think that I am downgrading to RH 6.2 for something stable. Crashes RH 6.0 -> 2 RH 6.2 -> 0 RH 7.0 -> 23
Hmm. Are you also running a DNS server on the system, or resolving the addresses directly? If possible, try without using DNS, as this might be a problem with Bind too. There have been reports of weird behaviour in the past.
Thanks for the continued help! Ok, the DNS server is the Universities and I am assuming that nothing is wrong with it, since it serves 20,000 other computers on campus without a problem :) My /etc/resolv.conf looks like search agron.iastate.edu nameserver 129.186.142.200 nameserver 129.186.1.200 nameserver 129.186.140.200 I should try recompiling apache with the new gcc and see what happens. I think that this problem is an annoyance more than anything. I just restart apache every two days and the DNS connections go away as reported by netstat. I upgraded to 2.2.18 kernel and the server has yet to crash, knock on wood. Thanks
Ok, Who knows what the problem was, but it has stopped since I updated to glibc-2.2-12 ... Just another RH7 oddity. Kernel 2.4.0 has also kept my machine up for a week now, which is the longest run since I upgraded to RH7. Life is good again. Thanks for the time.