How to increase the limit of open files from Apache?

Question

Apache HTTP Server

Hello!
Warnings and errors appeared in the Apache log of the following nature:

PHP Warning: require_once: failed to open stream: Too many open files

I started trying to increase the allowed number of files to open.
In /etc/sysctl.conf :

fs.file-max = 100000

In /etc/security/limits.conf :

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

Impersonating an apache user , requesting active limits:

su apache -s /bin/sh
ulimit -a
...
open files (-n) 65535
...

But looking at the httpd process limits I get the following:

cat /proc/5346/limits
...
Max open files 1024
...

Therefore, my previous manipulations are useless. Tried enough of everything.
I would be very, very grateful! I've been scratching my head and dirtying magazines for a long time.
CentOS 7.2
Apache 2.4

Answer 1

serverfault.com/questions/628610/increasing-nproc-...