LVS的跨网络DR实现

#环境准备：
5台主机
客户端client       vmnet1仅主机网络 eth0：192.169.33.160/24 GW：192.168.33.200
路由器router        vmnet1仅主机网络 eth1：192.169.33.200/24
			     vmnet8 NAT网络 eth0: 10.0.0.200/24  eth0:1: 192.168.0.200/24
负载调度器LVS      vip：lo 192.168.0.100/32  
			     DIP：eth0 NAT 10.0.0.150/24 GW:10.0.0.200
后端web服务器RS1   vip：lo 192.168.0.100/32  
			     DIP：eth0 NAT 10.0.0.160/24 GW:10.0.0.200
后端web服务器RS2   vip：lo 192.168.0.100/32  
			     DIP：eth0 NAT 10.0.0.170/24 GW:10.0.0.200
			     
#client：
[root@client ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
NAME=eth0
DEVICE=eth0
ONBOOT=yes
IPADDR=192.168.33.160
PREFIX=24
GATEWAY=192.168.33.200

[root@client ~]# systemctl restart network

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

[root@router ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
TYPE=Ethernet
BOOTPROTO=static
DEFROUTE=yes
NAME=eth1
DEVICE=eth1
ONBOOT=yes
IPADDR=192.168.33.200
PREFIX=24

[root@router ~]# systemctl restart network
#添加临时eth0网卡子接口eth0:1配置ip地址。
[root@router ~]# ip a add 192.168.0.200/24 dev eth0
#测试仅主机网络，和客户端正常通信
[root@router ~]# ping 192.168.33.160
PING 192.168.33.160 (192.168.33.160) 56(84) bytes of data.
64 bytes from 192.168.33.160: icmp_seq=1 ttl=64 time=0.490 ms
64 bytes from 192.168.33.160: icmp_seq=2 ttl=64 time=0.859 ms

#配置开启路由转发功能
[root@router ~]# echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf
[root@router ~]# sysctl -p
net.ipv4.ip_forward = 1
[root@router ~]# cat /proc/sys/net/ipv4/ip_forward
1

#LVS：
#网络配置
[root@lvs ~]#vim /etc/sysconfig/network-scripts/ifcfg-eth0
TYPE=Ethernet
BOOTPROTO=static
NAME=eth0
DEVICE=eth0
IPADDR=10.0.0.150
PREFIX=24
GATEWAY=10.0.0.200
ONBOOT=yes
[root@lvs ~]#nmcli c reload
[root@lvs ~]#nmcli c up eth0
[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
[root@lvs ~]#ping 192.168.33.160
PING 192.168.33.160 (192.168.33.160) 56(84) bytes of data.
64 bytes from 192.168.33.160: icmp_seq=1 ttl=63 time=0.919 ms
64 bytes from 192.168.33.160: icmp_seq=2 ttl=63 time=4.51 ms

#配置vip
[root@lvs ~]#ifconfig  lo:1 192.168.0.100 netmask 255.255.255.255



#RS1：
#网络配置
[root@RS1 ~]#vim /etc/sysconfig/network-scripts/ifcfg-eth0
TYPE=Ethernet
BOOTPROTO=static
NAME=eth0
DEVICE=eth0
IPADDR=10.0.0.160
PREFIX=24
GATEWAY=10.0.0.200
ONBOOT=yes
[root@RS1 ~]#nmcli c reload
[root@RS1 ~]#nmcli c up eth0
[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

#web服务配置
[root@RS1 ~]#yum install -y httpd
[root@RS1 ~]#echo 10.0.0.160 >> /var/www/html/index.html
[root@RS1 ~]#systemctl restart httpd
[root@RS1 ~]#curl localhost
10.0.0.160

#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
#配置vip
[root@RS1 ~]#ifconfig  lo:1 192.168.0.100 netmask 255.255.255.255


#RS2：
#网络配置
[root@RS2 ~]#vim /etc/sysconfig/network-scripts/ifcfg-eth0
TYPE=Ethernet
BOOTPROTO=static
NAME=eth0
DEVICE=eth0
IPADDR=10.0.0.170
PREFIX=24
GATEWAY=10.0.0.200
ONBOOT=yes
[root@RS2 ~]#nmcli c reload
[root@RS2 ~]#nmcli c up eth0

#web服务配置
[root@RS2 ~]#yum install -y httpd
[root@RS2 ~]#echo 10.0.0.170 >> /var/www/html/index.html
[root@RS2 ~]#systemctl restart httpd
[root@RS2 ~]#curl localhost
10.0.0.170

#IPVS配置
[root@RS2 ~]#echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
[root@RS2 ~]#echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
[root@RS2 ~]#echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
[root@RS2 ~]#echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
#配置vip
[root@RS2 ~]#ifconfig  lo:1 192.168.0.100 netmask 255.255.255.255

#LVS集群配置：
[root@lvs ~]#yum install -y ipvsadm-1.31-1.el8.x86_64.rpm
[root@lvs ~]#ipvsadm  -A -t 192.168.0.100:80 -s wrr
[root@lvs ~]#ipvsadm  -a -t 192.168.0.100:80 -r 10.0.0.160 -g -w 1
[root@lvs ~]#ipvsadm  -a -t 192.168.0.100:80 -r 10.0.0.170 -g -w 1

#测试client：
[root@client ~]# curl 192.168.0.100
10.0.0.170
[root@client ~]# curl 192.168.0.100
10.0.0.160
[root@client ~]# curl 192.168.0.100
10.0.0.170
[root@client ~]# curl 192.168.0.100
10.0.0.160