I tried several way to change open file limit from URL
http://www.cyberciti.biz/faq/linux-increase-the-maximum-number-of-open-files/
which I have changed limit.conf and /etc/sysctl.conf
it work with other user , but limit open file of root doesn't changed
/etc/security/limits.conf
#####
* - nproc 8500
* hard nofile 200000
* soft nofile 200000
* hard stack 8192
* hard sigpending 45056
root hard nofile 200000
root soft nofile 200000
root hard no file 200000
/etc/sysctl.conf
# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 4294967296
fs.file-max = 200000
Reboot server , After that
[root@ironman ~]# ulimit -n
8192
Finally I add command below on /etc/bashrc and it works for root user as well I really don't understand why setting only on sysctl.conf /limits.conf doesn't affect ?
Please advise