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



Am 18.09.2018 um 11:51 schrieb Mirko Parthey:
> On Tue, Sep 18, 2018 at 12:14:11AM +0200, Martin wrote:
>> 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.
> 
> There may be two issues here, my answer refers to 
> 'cgroup: fork rejected by pids controller'.
> 
> Is there any limit set in pids.max for the apache cgroup under the pids controller?
> # cd /sys/fs/cgroup/pids/...
> # cat pids.max

There is no pids.max
But I have a /proc/sys/kernel/pid_max = 32768
I guess like systemd is limiting here?

> How many tasks are assigned to the cgroup?
> # wc -l tasks

103 tasks

> Mirko
> 


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