The experiment needs five virtual machines, all of which are centos7

**Client configuration**
vim /etc/sysconfig/nerwork-scripts/ifcfg-ens33
DEVICE=ens33
NAME=ens33
BOOTPROTO=static
IPADDR=172.22.144.188
PREFIX=16
ONBOOT=yes
GATEWAY=172.22.144.17
//Because the client IP and VIP are not in the same network segment, the gateway needs to point to the router

Router configuration
vim /etc/sysconfig/nerwork-scripts/ifcfg-ens33
DEVICE=ens33
NAME=ens33
BOOTPROTO=static
IPADDR=172.22.144.17
ONBOOT=yes
PREFIX=16
 Router configuration 1 interface network card to connect to the external network

vim /etc/sysconfig/nerwork-scripts/ifcfg-ens37
DEVICE=ens37
IPADDR=192.168.49.5
PREFIX=24
 Router is configured with 2 interface network card to connect the Intranet

vim /sysctl.conf
net.ipv4.ip_forward=1
 Add this line to the routing profile

sysctl -p
 Start routing forwarding service

lvs Configuration
vim /etc/sysconfig/network-scripts/ifcfg-ens33
DEVICE=ens33
NAME=ens33
BOOTPROTO=static
IPADDR=192.168.49.2
PREFIX=24
ONBOOT=yes
GATEWAY=192.168.49.5
//Point lvs ip gateway to router 2 interface

rs Server configuration
DEVICE=ens33
NAME=ens33
BOOTPROTO=static
IPADDR=192.168.49.3
PREFIX=24
ONBOOT=yes
GATEWAY=192.168.49.5
//Point all the gateways of rs service 1 and 2 to router 2 interface

vs One click installation script
vim lvs_dr_vs.sh 
#!/bin/bash
#Author:wangxiaochun
#Date:2017-08-13
vip='192.168.49.100'
iface='lo:1'
mask='255.255.255.255'
port='80'
rs1='192.168.49.3'
rs2='192.168.49.4'
scheduler='wrr'
type='-g'
rpm -q ipvsadm &> /dev/null || yum -y install ipvsadm &> /dev/null

case $1 in
start)
    ifconfig $iface $vip netmask $mask #broadcast $vip up
    iptables -F

    ipvsadm -A -t ${vip}:${port} -s $scheduler
    ipvsadm -a -t ${vip}:${port} -r ${rs1} $type -w 1
    ipvsadm -a -t ${vip}:${port} -r ${rs2} $type -w 1
    echo "The VS Server is Ready!"
    ;;
stop)
    ipvsadm -C
    ifconfig $iface down
    echo "The VS Server is Canceled!"
    ;;
*)
    echo "Usage: $(basename $0) start|stop"
    exit 1
    ;;
esac

rs1 Server one click installation script
#!/bin/bash
#Author:wangxiaochun
#Date:2017-08-13
vip=192.168.49.100
mask='255.255.255.255'
dev=lo:1
rpm -q httpd &> /dev/null || yum -y install httpd &>/dev/null
service httpd start &> /dev/null && echo "The httpd Server is Ready!"
echo "<h1>rs1</h1>" > /var/www/html/index.html

case $1 in
start)
    echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
    echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
    echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
    echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
    ifconfig $dev $vip netmask $mask #broadcast $vip up
    #route add -host $vip dev $dev
    echo "The RS Server is Ready!"
    ;;
stop)
    ifconfig $dev down
    echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
    echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore
    echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
    echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce
    echo "The RS Server is Canceled!"
    ;;
*)
    echo "Usage: $(basename $0) start|stop"
    exit 1
    ;;
esac

rs2 Server one click installation script

#!/bin/bash
#Author:wangxiaochun
#Date:2017-08-13
vip=192.168.49.100
mask='255.255.255.255'
dev=lo:1
rpm -q httpd &> /dev/null || yum -y install httpd &>/dev/null
service httpd start &> /dev/null && echo "The httpd Server is Ready!"
echo "<h1>rs2</h1>" > /var/www/html/index.html

case $1 in
start)
    echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
    echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
    echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
    echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
    ifconfig $dev $vip netmask $mask #broadcast $vip up
    #route add -host $vip dev $dev
    echo "The RS Server is Ready!"
    ;;
stop)
    ifconfig $dev down
    echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
    echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore
    echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
    echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce
    echo "The RS Server is Canceled!"
    ;;
*)
    echo "Usage: $(basename $0) start|stop"
    exit 1
    ;;
esac

bash lvs_dr_rs.sh start/stop
 This is the start and stop command of these three scripts!

Start all scripts and test on the client!

while true;do curl 192.168.49.100;sleep 0.5;done
111
lvyao
111
lvyao
111
lvyao
111
lvyao
111
lvyao
.....
DR The construction of load balancing mode (single network segment) has been completed!!!!!!!!!!!