Shulou(Shulou.com)06/02 Report--

The principle of LVS-NAT model is as follows:

When a user request arrives at the Director, the requested Datagram first goes to the PREROUTING chain in the kernel space. In this case, the source IP of the message is CIP, and the destination IP is VIP;PREROUTING. Check and find that the destination IP of the packet is local, and send the packet to the INPUT chain. IPVS compares whether the service requested by the packet is a cluster service. If so, modify the destination IP address of the packet to the back-end server IP, and then send the packet to the POSTROUTING chain. In this case, the source IP of the message is CIP, and the destination IP is RIP; through routing, the POSTROUTING chain sends the packet to the IP of Real Server;Real Server comparison and finds that the target is its own, and starts to build the response message and send it back to Director Server. In this case, the source IP of the message is RIP, and the destination IP is CIP. Before responding to the client, Director Server will modify the source IP address to its own VIP address, and then respond to the client. In this case, the source IP of the message is VIP, and the destination IP is the implementation IP assignment of the CIP;NAT model.

DIP:192.168.177.210

VIP:192.168.157.100

On SIP1:192.168.177.211 SIP2:192.168.177.211 and real server, you only need to install httpd and start the service.

Yum install-y httpd

Echo "RS2" > / var/www/html/index.html

/ etc/init.d/httpd restart2, configuration on Director

Install ipvsadm

Yum install-y ipvsadm

Enable routing forwarding function

Echo 1 > / proc/sys/net/ipv4/ip_forward

Turn off the firewall

/ etc/init.d/iptables stop

Clear and create an ipvs server

Ipvsadm-C

Ipvsadm-A-t 192.168.177.220 80-s wrr

Add backend real server

Ipvsadm-a-t 192.168.157.100 80-r 192.168.177.211-m-w 1

Ipvsadm-a-t 192.168.157.100 80-r 192.168.177.212-m-w 2

Configuration complete

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