Hi. A while back I migrated DNS from some old PC servers running NetBSD and bind 9 to some new shiny Sun X4200's running Solaris 10 and bind 9 (Sun's installed version).
One of the first thigs we noticed on the internal DNS servers that allow recursion is that the maximum number of recursive clients was being hit regularly. I upped the value a few times, eventually settling on 4000 as that seems to have stopped the messages. On one of these servers I am now seeing a lot of: socket: too many open file descriptors ... errors in the messages log! Curious because even if we were at the limit of 4000 clients, the current limit on file descriptors is ... dns# plimit 354 354: /usr/sbin/named resource current maximum time(seconds) unlimited unlimited file(blocks) unlimited unlimited data(kbytes) unlimited unlimited stack(kbytes) unlimited unlimited coredump(blocks) unlimited unlimited nofiles(descriptors) 65536 65536 vmemory(kbytes) unlimited unlimited 65,536! Which would mean each and every recursing query using 16 file descriptors? Or is there a different lower limit on sockets? I have not heard of such a thing? Have I set the recursing limit higher than the FD_SETSIZE for select (being 1024 for 32-bit apps on Solaris), can that be the problem? Doesn't look that way as the perror states socket! Any ideas welcome! Thanks. -- Barry Dean Networks Team http://pcwww.liv.ac.uk/~bvd/
