iptables -t nat -A PREROUTING -p tcp --dport 80 -d 192.168.1.2 -i eth0 -j DNAT --to 192.168.2.115:80
iptables -t nat -A PREROUTING -p tcp --dport 80 -d 192.168.1.2 -i eth0 -j DNAT --to 192.168.2.119:80
iptables -t nat -A POSTROUTING -p tcp --dport 80 -o eth0 -j SNAT --to 192.168.1.2

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -A FORWARD -i eth0 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT
/sbin/iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT

iptables -A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT 
iptables -A INPUT -i eth0 -p tcp -m tcp --dport 8080 -j ACCEPT

iptables -A INPUT -m tcp -p tcp --dport 53 -j ACCEPT
iptables -A INPUT -m udp -p tcp --dport 53 -j ACCEPT

# Generated by iptables-save v1.4.7 on Thu Jul 11 16:46:05 2013
*nat
REROUTING ACCEPT [26:5297]
OSTROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [34:2040]
-A PREROUTING -d 192.168.1.2/32 -i eth0 -p tcp -m tcp --dport 80 -j DNAT --to-destination 192.168.2.115:80
-A PREROUTING -d 192.168.1.2/32 -i eth0 -p tcp -m tcp --dport 80 -j DNAT --to-destination 192.168.2.119:80
-A POSTROUTING -o eth0 -p tcp -m tcp --dport 80 -j SNAT --to-source 192.168.1.2
-A POSTROUTING -o eth0 -j MASQUERADE
COMMIT
# Completed on Thu Jul 11 16:46:05 2013
# Generated by iptables-save v1.4.7 on Thu Jul 11 16:46:05 2013
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [366:198764]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT
-A INPUT -i eth1 -p tcp -m tcp --dport 8080 -j ACCEPT
-A INPUT -m tcp -p tcp --dport 53 -j ACCEPT
-A INPUT -m udp -p tcp --dport 53 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -i eth0 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i eth1 -o eth0 -j ACCEPT
COMMIT
# Completed on Thu Jul 11 16:46:05 2013

iptables -t nat -A PREROUTING -p tcp --dport 80 -d 192.168.1.2 -i eth0 -j DNAT --to 192.168.2.115:80

WebServer1: 192.168.2.115 (abc.com.vn)

WebServer2: 192.168.2.119 (def.com.vn)

cache_peer 192.168.2.115 parent 80 0 no-query originserver name=centos6
cache_peer_domain centos6 abc.com.vn
cache_peer 192.168.2.119 parent 80 0 no-query originserver name=servertv
cache_peer_domain servertv def.com.vn

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

## Basic reverse proxy server ##
## Apache backend for abc.com.vn ##
upstream apachephp  {
      server 192.168.2.115:80; 
}


## Start abc.com.vn##
server {
    listen     192.168.1.2:80;
    server_name  abc.com.vn;

    access_log  /var/log/nginx/abc.com.vn.access.log  main;
    error_log  /var/log/nginx/abc.com.vn.error.log;
    #root   /usr/share/nginx/html;
    #index  index.html index.htm;

    ## send request back to apache1 ##
    location / {
     proxy_pass  http://apachephp;
     include        /etc/nginx/conf.d/proxy.conf;
   }
}
## End thongtinkhcn.vinhlong.gov.vn##

}

proxy_wwwect          off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

client_max_body_size 100M;
client_body_buffer_size 1m;
proxy_intercept_errors on;
proxy_buffering on;
proxy_buffer_size 128k;
proxy_buffers 256 16k;
proxy_busy_buffers_size 256k;
proxy_temp_file_write_size 256k;
proxy_max_temp_file_size 0;
proxy_read_timeout 300;

-rw-r--r--.  1 nginx root     0 Aug 20 21:09 access.log
-rw-r--r--.  1 nginx root     0 Aug 26 21:48 error.log
-rw-r--r--.  1 nginx root     0 Aug 21 15:09 abc.com.vn.access.log
-rw-r--r--.  1 nginx root     0 Aug 21 15:09 abc.com.vn.error.log

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

upstream  abc.com.vn  {
        server   192.168.2.115:80;
}
server
{
        listen  192.168.1.2:80;
        server_name  abc.com.vn;
        location / {
                 proxy_pass        http://abc.com.vn;
                 include        /etc/nginx/conf.d/proxy.conf;
                 #proxy_set_header   Host             $host;
                 #proxy_set_header   X-Real-IP        $remote_addr;
                 #proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
        }
}
upstream  def.com.vn  {
        server   192.168.2.119:80;
}
server
{
        listen  192.168.1.2:80;
        server_name  def.com.vn;
        location / {
                 proxy_pass        http://def.com.vn;
                 include        /etc/nginx/conf.d/proxy.conf;
                 #proxy_set_header   Host             $host;
                 #proxy_set_header   X-Real-IP        $remote_addr;
                 #proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
        }
        
}

}

proxy_wwwect          off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

client_max_body_size 100M;
client_body_buffer_size 1m;
proxy_intercept_errors on;
proxy_buffering on;
proxy_buffer_size 128k;
proxy_buffers 256 16k;
proxy_busy_buffers_size 256k;
proxy_temp_file_write_size 256k;
proxy_max_temp_file_size 0;
proxy_read_timeout 300;

-rw-r--r--.  1 nginx root     0 Aug 20 21:09 access.log
-rw-r--r--.  1 nginx root     0 Aug 26 21:48 error.log

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

upstream  apachephp  {
        server   192.168.2.115:80;
}
server
{
        listen  192.168.1.2:80;
        server_name  abc.com.vn;
        location / {
                 proxy_pass        http://apachephp;
                 include        /etc/nginx/conf.d/proxy.conf;
                 #proxy_set_header   Host             $host;
                 #proxy_set_header   X-Real-IP        $remote_addr;
                 #proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
        }
}
upstream  thuvien  {
        server   192.168.2.119:80;
}
server
{
        listen  192.168.1.2:80;
        server_name  def.com.vn;
        location / {
                 proxy_pass        http://thuvien;
                 include        /etc/nginx/conf.d/proxy.conf;
                 #proxy_set_header   Host             $host;
                 #proxy_set_header   X-Real-IP        $remote_addr;
                 #proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
        }
        
}

}

-A PREROUTING  -p tcp -dport 80 -j REDIRECT --to-ports 80

-A PREROUTING  -p tcp -dport 80 -j REDIRECT --to-ports 80