Issue Checking for nginx ULIMIT value 3 domains have been found on server

[Azurel]

I have a new CentOS 8.2 server with Plesk Obsidian.

I tried extension "repair kit" and found for web & ftp services this warning

Checking for nginx ULIMIT value 3 domains have been found on server. Problem with nginx default limit for open files is possible Please check nginx fails to start/reload on a Plesk server: Too many open files for details

After click on repair it said

Repair Kit fixed all issues it could. If any issues were not fixed, please try fixing them manually or contact Plesk Support.

after click on check again "1 issue(s) detected".

UPDATE:
I have set worker_rlimit_nofile 40000; (above line "http {") in /etc/nginx/nginx.conf and restart nginx. But thats not helped.

# grep 'Max open files' /proc/$(cat /var/run/nginx.pid)/limits
Max open files 1024 262144 files

# ulimit -Hn
262144
# ulimit -Sn
1024

 

[Necroman]

After repairing the errors on Plesk Repair Kit, using the fix options, check for errors again and they will reappear.

Check here: Issue - Plesk Obsidian 18.0.29 update makes my Wordpress sites malfunction
I've have the same issue after updating to 18.0.29 - but here's worse, the update broke all my Wordpress sites

 

[Azurel]

# /usr/local/psa/admin/sbin/websrv_ulimits --get
nginx:-1
apache:-1

Currently limits are not set in plesk

# grep 'Max open files' /proc/$(cat /var/run/nginx.pid)/limits
Max open files            1024                 262144               files

Find PID with

#  ps axl | grep nginx:.master
5     0  110248       1  20   0  52868 10456 -      Ss   ?          0:00 nginx: master process /usr/sbin/nginx
0     0  148976  137904  20   0  12240  2372 -      S+   pts/0      0:00 grep --color=auto nginx:.master

Show values

# cat /proc/110248/limits
Limit                     Soft Limit           Hard Limit           Units
Max cpu time              unlimited            unlimited            seconds
Max file size             unlimited            unlimited            bytes
Max data size             unlimited            unlimited            bytes
Max stack size            8388608              unlimited            bytes
Max core file size        unlimited            unlimited            bytes
Max resident set          unlimited            unlimited            bytes
Max processes             514117               514117               processes
Max open files            1024                 262144               files
Max locked memory         65536                65536                bytes
Max address space         unlimited            unlimited            bytes
Max file locks            unlimited            unlimited            locks
Max pending signals       514117               514117               signals
Max msgqueue size         819200               819200               bytes
Max nice priority         0                    0
Max realtime priority     0                    0
Max realtime timeout      unlimited            unlimited            us

This issue is fixed with
# /usr/local/psa/admin/sbin/websrv_ulimits --set 4096 --no-restart
and restart nginx + apache