Symptoms
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Webmail works extremely slow.
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The following errors can be found in Apache 2 log file (
/var/log/apache2/error.log):[fcgid:warn] [pid 15866:tid 139793676725184] (11)Resource temporarily unavailable: mod_fcgid: spawn process /var/www/cgi-bin/cgi_wrapper/cgi_wrapper error
[fcgid:error] [pid 15866:tid 139793676725184] (11)Resource temporarily unavailable: mod_fcgid: can't run /var/www/cgi-bin/cgi_wrapper/cgi_wrapper
[fcgid:warn] [pid 15866:tid 139793676725184] (11)Resource temporarily unavailable: mod_fcgid: spawn process /var/www/cgi-bin/cgi_wrapper/cgi_wrapper error
[fcgid:warn] [pid 15867:tid 139793417606912] [client 203.0.113.2:23789] mod_fcgid: can't apply process slot for /var/www/cgi-bin/cgi_wrapper/cgi_wrapper -
The cgi_wrapper permissions are correct:
# namei -l /var/www/cgi-bin/cgi_wrapper/cgi_wrapper
f: /var/www/cgi-bin/cgi_wrapper/cgi_wrapper
drwxr-xr-x root root /
drwxr-xr-x root root var
drwxr-xr-x root root www
drwxr-xr-x root root cgi-bin
drwxr-xr-x root root cgi_wrapper
-rwxr-xr-x root root cgi_wrapper -
The FcgidMaxProcesses following were adjusted already :
# grep -irE 'FcgidMaxProcesses|FcgidMaxProcessesPerClass' /etc/apache2/
/etc/apache2/mods-available/fcgid.conf: FcgidMaxProcesses 300
/etc/apache2/mods-available/fcgid.conf: FcgidMaxProcessesPerClass 15
Cause
The systemd slice limit for Apache 2 is set to a very low value:
# cat /sys/fs/cgroup/pids/system.slice/apache2.service/pids.{max,current}
60
59
Normally it should be at least 2000 for pids.max
Resolution
1. Using vi (or other editor) open file /etc/systemd/system.conf
2. Uncomment (remove "#") the following line, and set its value to 2000 as follows:
DefaultTasksMax=2000
3. Save the file.
4. Restart apache2 web server using the following command:
# systemctl restart apache2