On 11/13/23 13:48, Alex wrote:
Hi, what is the current way to increase the number of available open
files? This is for a mariadb database server I'm trying to configure
based on instructions from the database developer to increase the total
number of files to 50000. I've added the following to
/etc/security/limits.conf and rebooted:
root - nofile 50000
ulimit -n as root now shows:
# ulimit -n
50000
As mentioned, this only applies to the root use while logged in, not
services.
Can this value also be set by using sysctl and setting fs.file-max to 50000?
# sysctl -a|grep file
fs.file-max = 50000
fs.file-nr = 6864 0 50000
fs.xfs.filestream_centisecs = 3000
The default value here is:
# sysctl -a | grep file
fs.file-max = 9223372036854775807
I think that is the maximum for the entire system, so you probably don't
want to limit that.
Checking a couple of services, I see that postgresql has
Max open files 1024 524288
files
and postfix has
Max open files 524288 524288
files
I assume that postfix has adjusted it's own soft limit as mentioned in
another email.
So the answer to the question in the subject is neither. If the service
doesn't adjust the limit itself, then you'll need to add an override
option for the service file.
As an aside, while doing this investigation I discovered that my desktop
has:
fs.file-nr = 45472 0 9223372036854775807
so I'm going to do some poking around to find out what is opening so
many files.
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