#172.16.252.10
[root@~ localhost]#route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.16.252.254  0.0.0.0         UG    100    0        0 ens33
172.16.0.0      0.0.0.0         255.255.0.0     U     100    0        0 ens33
192.168.2.0     0.0.0.0         255.255.255.0   U     100    0        0 ens37
[root@~ localhost]#setenforce 0
[root@~ localhost]#iptables -F
#打开核心转发工功能
[root@~ localhost]#sysctl -w net.ipv4.ip_forward=1
[root@~ localhost]#yum install -y ipvsadm
#定义集群服务
[root@~ localhost]#ipvsadm -A -t 172.16.252.10 -s rr
#管理集群服务
[root@~ localhost]#ipvsadm -a -t 172.16.252.10 -r 192.168.2.10 -m
[root@~ localhost]#ipvsadm -a -t 172.16.252.10 -r 192.168.2.12 -m
[root@~ localhost]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  172.16.252.10:80 rr
  -> 192.168.2.10:80              Masq    1      0          5         
  -> 192.168.2.12:80              Masq    1      0          5 

#172.16.252.10
[root@html localhost]#route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.2.140   0.0.0.0         UG    100    0        0 ens33
192.168.2.0     0.0.0.0         255.255.255.0   U     100    0        0 ens33
[root@html localhost]#setenforce 0
[root@html localhost]#iptables -F

#192.168.2.12
[root@html localhost]#route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.2.140   0.0.0.0         UG    100    0        0 ens33
192.168.2.0     0.0.0.0         255.255.255.0   U     100    0        0 ens33
[root@html localhost]#systemctl start httpd