Linux – How to increase the open file limit on Linux

centoslimitslinuxulimit

I am using CentOS 7. I found out that the current value can be seen using $ ulimit -a (look for open files).

Or just $ ulimit -n

Then I try to edit these limits by editing the file at 

$ vim /etc/security/limits.conf

and adding these two lines:

soft nofile 999999
hard nofile 999999

And after doing a quick reboot and checking if something has happened

$ ulimit -n

It is still the same, I get 1024 as output.

How do I change this value and make it persist after a reboot?

Best Answer

You need the user part at the start, and the wrong way around, should be:

* soft nproc 65535
* hard nproc 65535
* soft nofile 65535
* hard nofile 65535
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