Centos LVS Dr server load balancer configuration description

Environment:

LVS/Dr server: 200.168.10.1
Real rip: 200.168.10.2
Real rip: 200.168.10.3

VIP: 200.168.10.10

LVS server configuration:

Disable iptables and selinux to prevent failure due to firewall and other reasons.

Install ipvsadm

Yum-y install ipvsadm *

Run the following script:

#! /Bin/bash
# Ipvs. sh

# Bind 200.168.10.10 to the eth0: 0 interface. The subnet mask is 4 255 so that 200.168.10.10 only has this ip address in this network segment and does not conflict with other ip addresses.
/Sbin/ifconfig eth0: 0 200.168.10.10 broadcast 200.168.10.10 netmask bandwidth limit 255 up
# Add 200.168.10.10 to the route table. It is best to add the route table to avoid having no ip addresses in the route table.
/Sbin/ifconfig route add-host 200.168.10.10 dev eth0: 0

# Clear existing records of ipvs
/Sbin/ipvsadm-C
# Add the virtual service rr representation algorithm (average allocation)
/Sbin/ipvsadm-At 200.168.10.10: 80-s rr
#-G indicates Dr mode,-I indicates ip-tun, and-m indicates NAT mode
/Sbin/ipvsadm-at 200.168.10.10: 80-r 200.168.10.2: 80-g
/Sbin/ipvsadm-at 200.168.10.10: 80-r 200.168.10.3: 80-g
/Sbin/ipvsadm-L-n

Linux real server configuration:

/Sbin/ifconfig lo: 0 200.168.10.10 broadcast 200.168.10.10 netmask bandwidth limit 255 up
/Sbin/ifconfig route add-host 200.168.10.10 dev lo: 0

Echo 1>/proc/sys/net/ipv4/conf/lo/arp_ignore
Echo 2>/proc/sys/net/ipv4/conf/lo/arp_annoounce
Echo 1>/proc/sys/net/ipv4/conf/all/arp_ignore
Echo 2>/proc/sys/net/ipv4/conf/all/arp_annoounce