Linux increase the maximum number of open files question.

[ibelieveme]

default limitation umber 1024 set to all users following

[root@localhost ~]# tail /etc/security/limits.conf 
#*               hard    rss             10000
#@student        hard    nproc           20
#@faculty        soft    nproc           20
#@faculty        hard    nproc           50
#ftp             hard    nproc           0
#@student        -       maxlogins       4

# End of file
* soft nofile 1024
* hard nofile 1024

[root@localhost ~]# ulimit -n
1024

System-wide File Descriptors

[root@localhost ~]# cat /proc/sys/fs/file-max 
228182

Question: i checked the open files of php process to output 17541,i thin the limitation of ulimit.conf is per unique user,but it was failure ,i don't know where the issue .need you help Thanks.

[root@localhost ~]# lsof -n|awk '{s+=gsub(/php-fpm/,"a")}END{print s}'
17541

[Mudgen]

I've read this several times, and I really can't understand what you're asking.

It sounds as though you may be construing limits.conf to set aggregate limits per user. This file is taken into account by pam_limits. Per the pam_limits manpage, it sets limits per user _session_:

The pam_limits PAM module sets limits on the system resources that can
be obtained in a user-session.