File Descriptor limit and malfunction bind

[Ram Akuka]

Hi ,
i have a high load DNS server running bind 9.4.3 on RH -
yesterday we experienced a problem with the bind  (the bind froze) , and
when looking at the logs i saw the following error :
named error: socket: file descriptor exceeds limit (4096/4096)
i looked at my OS file descriptor limit and using ulimit -n   - 1024 .
where the number 4096 come from?

BTW
the named i'm running using 7 cpus (-n 7 when start).



please advice ,


--
Ram
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