Hi Imri,
Do you use any of the following in your configuration:
transfer-source
transfer-source-v6
notify-source
notify-source-v6
query-source
query-source-v6
Regards,
Cathy
Imri Zvik wrote:
> Hi,
>
> We've recently upgraded our caching servers to 9.4.3-P4/P3 (2 of them running
> 9.4.3-P4 and 2 running 9.4.3-P3). Few days ago I've noticed something
> strange - When the server is loaded, some queries randomly fails (SERVFAIL).
> It seems that only queries for which the answer is NOT cached are affected.
> I've verified with host/dig and tcpdump that there is no network issue (no
> unanswered packets). Digging deeper into the issue, I've found that the issue
> appears when the number of sockets used by named approach 1024~ (checked with
> netstat/lsof). The weirdest part, is that if I run "rndc reconfig", suddenly
> named is able to use more than 1024 sockets (I've seen it using 4000-5000~
> sockets), and the problem goes away for about an hour.
>
> If I downgrade to 3.4.2-P2 the problems goes away.
>
> I used the following command to reproduce the problem:
> for i in {1..100000}; do dig mx www.cnn.com @localhost |grep status |grep -v
> NOERROR; done
>
> My servers are running RHEL 5.4 (2.6.18-164.9.1.el5) and FreeBSD 7.0 (the
> problem is seen on both), and they are splitted into two, unrelated,
> networks, and on two separate physical locations.
>
> I've compiled bind from the vanilla ISC sources using the following configure
> command:
>
> ./configure --enable-threads --enable-largefile --prefix=/usr/local
>
> I've also tried the following (I've also raised the OS limits, of course):
> STD_CDEFINES="-DISC_SOCKET_FDSETSIZE=1048576" ./configure --enable-threads
> --enable-largefile --prefix=/usr/local
>
> As I was seeing the "general: error: socket: file descriptor exceeds limit
> (4096/4096)" error a couple of days ago.
>
> My best guess is that the problem is related to the recent move to epoll...
>
> Any ideas on how I should proceed from here?
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