LVS的跨网络DR实现

一、网络配置

1.1 客户端

#客户端配置
[root@client ~]#cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
NAME=eth0
BOOTPROTO=static
IPADDR=192.168.50.6
GATEWAY=10.0.0.200
PREFIX=24
ONBOOT=yes
[root@client ~]#route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.0.0.200      0.0.0.0         UG    100    0        0 eth0
10.0.0.200      0.0.0.0         255.255.255.255 UH    100    0        0 eth0
192.168.50.0    0.0.0.0         255.255.255.0   U     100    0        0 eth0

1.2 路由器配置

#启用ip_forward
[root@router ~]#echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf
[root@router ~]#sysctl -p

[root@router ~]#cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
NAME=eth0
BOOTPROTO=static
IPADDR=10.0.0.200
PREFIX=24
ONBOOT=yes
[root@router ~]#cat /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
NAME=eth1
BOOTPROTO=static
IPADDR=192.168.50.200
PREFIX=24
ONBOOT=yes

1.3后端服务器RS

#RS1
[root@rs1 ~]#cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
NAME=eth0
BOOTPROTO=static
IPADDR=10.0.0.7
PREFIX=24
GATEWAY=10.0.0.200
ONBOOT=yes
[root@rs1 ~]#route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.0.0.200      0.0.0.0         UG    100    0        0 eth0
10.0.0.0        0.0.0.0         255.255.255.0   U     100    0        0 eth0
[root@rs1 ~]#yum -y install httpd
[root@rs1 ~]#systemctl enable --now httpd
[root@rs1 ~]#hostname -I > /var/www/html/index.html
[root@rs1 ~]#curl 10.0.0.7
10.0.0.7

#RS2
[root@rs2 ~]#cat /etc/sysconfig/network-scripts/ifcfg-eth0
NAME=eth0
BOOTPROTO=static
IPADDR=10.0.0.17
PREFIX=24
GATEWAY=10.0.0.200
ONBOOT=yes
[root@rs2 ~]#route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.0.0.200      0.0.0.0         UG    100    0        0 eth0
10.0.0.0        0.0.0.0         255.255.255.0   U     100    0        0 eth0
[root@rs2 ~]#yum -y install httpd
[root@rs2 ~]#systemctl enable --now httpd
[root@rs2 ~]#hostname -I > /var/www/html/index.html
[root@rs2 ~]#curl 10.0.0.17
10.0.0.17

1.4LVS

[root@lvs ~]#cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
NAME=eth0
BOOTPROTO=static
IPADDR=10.0.0.8
PREFIX=24
GATEWAY=10.0.0.200
ONBOOT=yes
[root@lvs ~]#route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.0.0.200      0.0.0.0         UG    100    0        0 eth0
10.0.0.0        0.0.0.0         255.255.255.0   U     100    0        0 eth0

1.5 网络测试

#确保能够ping通
[root@client ~]#ping 10.0.0.7
[root@client ~]#ping 10.0.0.17
[root@client ~]#ping 10.0.0.8

二、配置LVS

2.1 后端RS的IPVS配置

# LVS的IPVS配置
[root@lvs ~]#ifconfig lo:1 170.16.0.100/32

#RS1的IPVS配置
[root@rs1 ~]#echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
[root@rs1 ~]#echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
[root@rs1 ~]#echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
[root@rs1 ~]#echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
[root@rs1 ~]#ifconfig lo:1 10.0.0.100/32

#RS2的IPVS配置
[root@rs2 ~]#echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
[root@rs2 ~]#echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
[root@rs2 ~]#echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
[root@rs2 ~]#echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
[root@rs2 ~]#ifconfig lo:1 10.0.0.100/32

2.2 实现LVS 规则

[root@lvs ~]#yum -y install ipvsadm
[root@lvs ~]#ipvsadm -A -t 10.0.0.100:80 -s rr
[root@lvs ~]#ipvsadm -a -t 10.0.0.100:80 -r 10.0.0.7:80 -g
[root@lvs ~]#ipvsadm -a -t 10.0.0.100:80 -r 10.0.0.17:80 -
[root@lvs ~]#ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.0.0.100:80 rr
  -> 10.0.0.7:80                  Route   1      0          0         
  -> 10.0.0.17:80                 Route   1      0          0    

2.3 测试访问

[root@client ~]#while :;do curl 10.0.0.100;sleep 1;done
10.0.0.7
10.0.0.17
10.0.0.7
10.0.0.17
10.0.0.7
....