First we need to install the nginx repo

[root@abc ~]# cd /etc/yum.repos.d/

[root@abc yum.repos.d]# wget http://nginx.org/packages/centos/6/noarch/RPMS/nginx-release-centos-6-0.el6.ngx.noarch.rpm

[root@abc yum.repos.d]# rpm -ivh nginx-release-centos-6-0.el6.ngx.noarch.rpm

[root@abc yum.repos.d]# yum install nginx

[root@abc ~]# cat /proc/cpuinfo  | grep processor | wc -l

8

The above output shows there are 8 processors. So edit the nginx conf file and make the changes.

[root@abc ~]# vi /etc/nginx/nginx.conf

worker_processes  8;
Save and exit the file.

nginx works on port 80. So, enable that port in server firewall.

[root@abc ~]# vi /etc/sysconfig/iptables

Add the following line to it, save and exit.

-A INPUT -m state –state NEW -p tcp –dport 80 -j ACCEPT

[root@abc ~]# /etc/rc.d/init.d/iptables restart

Now start nginx.

[root@abc ~]# /etc/rc.d/init.d/nginx start

Starting nginx:                                            [  OK  ]

Make sure nginx is listening on port 80

[root@abc ~]# netstat -plan | grep :80
tcp        0      0 0.0.0.0:80                  0.0.0.0:*                   LISTEN      8731/nginx

[root@abc ~]# chkconfig nginx on

[root@abc ~]# chkconfig –list | grep nginx
nginx           0:off   1:off   2:on    3:on    4:on    5:on    6:off

Main configuration file – /etc/nginx/nginx.conf

Default Document Root – /usr/share/nginx/html/

Virtual Hosts – /etc/nginx/sites-available/ and  /etc/nginx/sites-enabled/

Error Log – /var/log/nginx/error.log