Apache HTP-Server won't fork more than 3000 processes.

To: debian-user <debian-user@lists.debian.org>
Subject: Apache HTP-Server won't fork more than 3000 processes.
From: Martin <keine-eile@online.de>
Date: Tue, 18 Sep 2018 00:14:11 +0200
Message-id: <[🔎] 41274756-510b-72e4-67e6-73fc3f49af8d@online.de>

Hi list members,

I have an issue with Apache's HTTP-Server 2.4. It says 'Resource temporarily unavailable: AH00159: fork: Unable to fork new process'. I know, there are some hits with Google, but there is no solution to me.
Systemd knows about a task limit of 6000. mpm_prefork_module is set to 'ServerLimit 4000' and 'MaxRequestWorkers 4000'. ulimits are set to unlimited.
I also see in the kernel log 'cgroup: fork rejected by pids controller in /system.slice/apache2.service'. But this does not correlate with the httpd's messages from above, that comes only from time to time.
Why does this thing stop forking at about 3000 processes? I have a (not just one) Red Hat 6 in parallel, that one does.

Thanks, Martin.

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