*    soft nofile 64000
*    hard nofile 68000

fs.file-max = 200500

igor@ubuntu:~$ ulimit -Sn
64000
igor@ubuntu:~$ ulimit -Hn
68000

igor@ubuntu:~$ sudo ps aux|grep nginx
root      1124  0.0  0.0  45988   980 ?        Ss   01:04   0:00 nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
www-data  1125  0.0  0.2  46164  2372 ?        S    01:04   0:00 nginx: worker process
igor      2754  0.0  0.0   5108   848 pts/6    S+   01:14   0:00 grep --color=auto nginx
igor@ubuntu:~$ cat /proc/1124/limits
Limit                     Soft Limit           Hard Limit           Units

.....
Max open files            1024                 4096                 files
.....

igor@ubuntu:~$ sudo ps aux|grep php
root      1097  0.0  2.1 118388 22496 ?        Ss   01:04   0:00 php-fpm: master process (/etc/php/7.0/fpm/php-fpm.conf)
www-data  1140  0.0  0.5 118388  5532 ?        S    01:04   0:00 php-fpm: pool www
www-data  1141  0.0  0.5 118388  5532 ?        S    01:04   0:00 php-fpm: pool www
igor      2795  0.0  0.0   5108   852 pts/6    S+   01:20   0:00 grep --color=auto php
igor@ubuntu:~$ cat /proc/1097/limits
Limit                     Soft Limit           Hard Limit           Units
.....
Max open files            1024                 4096                 files
.....