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 >
