**Four virtual machines

**Note that LVS server needs to play the role of scheduling and routing. Two IP addresses need to be enabled
 Whether lvs server, rs1 server and rs2 server are in time synchronization
 seliunx and whether the firewall is closed
 Check whether the value cat / proc / sys / net / IPv4 / IP forward of this directory is 1 on lvs server. If 0, change to 1**

Configuration of RS server

vim /etc/sysconfig/network-scripts/ifcfg-ens33 
DEVICE=ens33
NAME=ens33
BOOTPROTO=static
IPADDR=192.168.49.3
PREFIX=24
ONBOOT=yes
GATEWAY=192.168.49.2

**rs1 The server points its gateway to the lvs The server DIP address
rs2 The same is true for servers**

route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.49.2    0.0.0.0         UG    100    0        0 ens33
192.168.49.0    0.0.0.0         255.255.255.0   U     100    0        0 ens33

**See rs1，2 Is the gateway pointing to the correct**

ping 192.168.49.4
ping 192.168.49.2

**stay rs1，2 Server ping The other side also has lvs Server to check whether the network is smooth**

`yum install httpd -y``
**Download httpd service on rs1, 2 server**

echo lvyaoyuanyuan1 > /var/www/html/index.html
echo lvyaoyuanyuan > /var/www/html/index.html

**stay rs1，2 Import content on the server to the home directory**

curl 192.168.49.3
curl 192.168.49.4

**stay rs1，2 View on server httpd Whether the service is normal**

LVS server configuration

`yum install ipvsadm.x86_64 -y`
**download ipvsadm package **

echo 0 > /proc/sys/net/ipv4/ip_forward
**Start routing and forwarding service**

vim /etc/sysctl.conf 
net.ipv4.ip_forward=1

**Add last entry to profile**

sysctl -p
**start-up ipforward service**

ipvsadm -A -t 172.22.144.59:80 -s rr

Add cluster VIP SET protocol as TCP protocol port as 80 port scheduling algorithm as polling

ipvsadm -a -t 172.22.144.59 -r 192.168.49.3:80 -m
ipvsadm -a -t 172.22.144.59 -r 192.168.49.4:80 -m
 Add two RS servers to TCP protocol mode as NAT mode

ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  172.22.144.59:80 rr
  -> 192.168.49.3:80              Masq    1      0          0         
  -> 192.168.49.4:80              Masq    1      0          0     
//Check whether the RS server of lvs cluster content joins

Client operation test lvs  nat Whether the cluster of mode is built successfully
while true;do curl 172.22.144.59;sleep 1;done
lvyaoyuanyuan1
lvyaoyuanyuan
lvyaoyuanyuan1
lvyaoyuanyuan
lvyaoyuanyuan1
lvyaoyuanyuan
lvyaoyuanyuan1
lvyaoyuanyuan
lvyaoyuanyuan1
lvyaoyuanyuan
lvyaoyuanyuan1
lvyaoyuanyuan
lvyaoyuanyuan1
lvyaoyuanyuan
..........
//This command accesses the lvs server for an infinite loop every second