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Limit file descriptor and indigestible malformed content
Hello,
I have a very busy Training Bind 9.4.3 DNS server on RH. We –
revealed a binding issue yesterday (content was hanging) and
when I definitely looked at the logs, I saw the following error:
Error titled: Socket: file descriptor exceeded prevention (4096/4096)
I looked at the file descriptor usage limit on my system and used ulimit -n – 800.
Where does the number 4096 come from?
By the way,
the one I’m using uses 7 CPU chips (-n 7 at startup).
What is your depletion limit (ulimit -n -H)?
The default
named seems to beforces the OS to strictly limit file descriptors,
even though ARM proclaims “Default |unlimited|.”. Theoretically, if running as root, it should be somewhat better to be able to set a hard and soft “infinite” limit, but that doesn’t seem to be the case, at least not on Solaris.< /p>
If you want to remove the limit on the number of files, the recommended method can be described as using
the “files” clause in the picks statement. This may not work particularly well,
however, if you try to increase the limit of each of ours beyond the hard limit set by the operating system,
for a process named cyclic that has lost root privileges.
In this case, you a reboot is required.
Author: Ram Akuka
Hi,
I have a busier dns server with 9 bind.4.3 for RH –
we had a bind problem yesterday (binding hung),
Named error : Socket: file descriptor over limit (4096/4096)
I looked at my OS’s file descriptor forbidding the file and used ulimit – n – 1440.
Where did it come fromn number 4096?
Author’s method
well-known, since I use 7 processor chips (-n 7 at startup).
please report< br>—
Ram
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Posted by Kevin Darcy
named seems to even use an OS that disables file descriptors by default
although ARM says “Default |unlimited|.”. Theoretically, if home is run as root
ideally one can set both rough and
soft mode for the “infinity” limit, but at least that doesn’t mean this tool doesn’t work on Solaris. .There is
this is not my Solaris 10 information. By law, if
the configuration file is not set, it uses it for RLIM_INFINITY
(lib/isc/unix/resource.c ), which is what I do on my servers :
$ plimit `pgrep named`
23385: /usr/local/sbin/named
Maximum current resource
Unlimited active time (seconds)
File(blocks) unlimited
data (kbytes) unlimited unlimited
stack (kbytes) large number notlimited
core dump(blocks) almost unlimited unlimited
no files(handles) almost unlimited unlimited
vmemory(kb) unpredictable unlimited
There were no files associated with 256 (soft) and
65536 (hard) in the calling environment, which turned out to be the OS default.
Actually, I accidentally ran a very old BIND schema on my test machine
(9.3.2), although I could quote documentation from a later version.
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You’re right, since at least 9.4.3-P4 (the lowest
supported version of BIND), named seems to be pushing the “infinity” limit, as the
documentation says.
It looks like Kevin Darcy’s contribution
named defaults to the operating system’s hard limit on file descriptors
although our own ARM default says “It’s |unlimited|”. When it is run
with superuser enabled, there should be an option in the music to set a hard and
soft “infinity” limit, it doesn’t seem to work, which
at least not in the case of Solaris.
>
You misunderstood, m My experience with Solaris 10. According to the code, if
is undefined in the music config file, it increments it to RLIM_INFINITY
$ plimit `pgrep named`
23385 : /usr/ local/ sbin/named
Max current resource
Time (seconds) unlimited unlimited
File (blocks) unlimited unlimited
Data (KB) infinite unlimited
Stack (KB) infinite unlimited
coredump(blocks) overwrites unlimited
br>nofiles(handles) unlimited unlimited
vmemory(kbytes) unlimited unlimited
call environment has no files to choose from 256 (soft) and
65536 (hard) which are operating system defaults.
Contributed by Ram Akuka
I have a higher load DNS where Server Bind 9.4.3 is available on RH –
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