1、LVS的跨网络DR实现
# 准备环境
环境：五台主机
一台：客户端 eth0:仅主机 192.168.0.6/24 GW:192.168.0.200
一台：ROUTER
eth0 :NAT 10.0.0.200/24
eth1: 仅主机 192.168.0.200/24
启用 IP_FORWARD
一台：LVS
eth0:NAT:DIP:10.0.0.8/24 GW:10.0.0.200
两台RS：
RS1：eth0:NAT:10.0.0.7/24 GW：10.0.0.200 lo:VIP 10.0.0.100/32
RS2：eth0:NAT:10.0.0.17/24 GW：10.0.0.200 lo:VIP 10.0.0.100/32
1.1 LVS的网络配置
#所有主机禁用iptables和SELinux
#internet主机环境
[root@internet ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
NAME=eth0
BOOTPROTO=static
IPADDR=192.168.0.6
PREFIX=24
GATEWAY=192.168.0.200
ONBOOT=yes
DNS1=202.101.172.35
[root@internet ~]# hostname
internet
[root@internet ~]# hostname -I
10.0.0.6
[root@internet ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
0.0.0.0 192.168.0.200 0.0.0.0 UG 0 0 0 eth0
[root@internet ~]# ping 10.0.0.7 -c1
PING 10.0.0.7 (10.0.0.7) 56(84) bytes of data.
64 bytes from 10.0.0.7: icmp_seq=1 ttl=63 time=2.10 ms
[root@internet ~]# ping 10.0.0.17 -c1
PING 10.0.0.17 (10.0.0.17) 56(84) bytes of data.
64 bytes from 10.0.0.17: icmp_seq=1 ttl=63 time=0.559 ms
#路由器的网络配置,添加双网卡
[root@router ~]# echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf
[root@router ~]# sysctl -p
net.ipv4.ip_forward = 1
[root@router network-scripts]#pwd
/etc/sysconfig/network-scripts
[root@router network-scripts]#cat ifcfg-ens37
DEVICE=ens33
NAME=ens33
BOOTPROTO=static
IPADDR=10.0.0.200
GATEWAY=10.0.0.1
PREFIX=24
ONBOOT=yes
DNS1=202.101.172.35
[root@router network-scripts]#cat ifcfg-ens37
DEVICE=ens37
NAME=ens37
BOOTPROTO=static
IPADDR=192.168.0.200
GATEWAY=192.168.0.1
PREFIX=24
ONBOOT=yes
DNS1=202.101.172.35
#RS1的网络配置
[root@rs1 ~]# hostname
rs1.yezeng.org
[root@rs1 ~]# hostname -I
10.0.0.7
[root@rs1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens33
DEVICE=ens33
NAME=ens33
BOOTPROTO=static
IPADDR=10.0.0.7
PREFIX=24
GATEWAY=10.0.0.200
ONBOOT=yes
DNS1=202.101.172.35
[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 ens33
10.0.0.0 0.0.0.0 255.255.255.0 U 100 0 0 ens33
[root@rs1 ~]# yum -y install httpd
[root@rs1 ~]# systemctl enable --now httpd.service
Created symlink from /etc/systemd/system/multi-user.target.wants/httpd.service to /usr/lib/systemd/system/httpd.service.
[root@rs1 ~]# ping 192.168.0.6 -c1
PING 192.168.0.6 (192.168.0.6) 56(84) bytes of data.
64 bytes from 192.168.0.6: icmp_seq=1 ttl=63 time=0.828 ms
[root@rs1 ~]# curl 10.0.0.7
10.0.0.7
#RS2 的网络配置
[root@rs2 ~]# hostname
rs2.yezeng.org
[root@rs2 ~]# hostname -I
10.0.0.17
[root@rs2 ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens33
DEVICE=ens33
NAME=ens33
BOOTPROTO=static
IPADDR=10.0.0.17
PREFIX=24
GATEWAY=10.0.0.200
ONBOOT=yes
DNS1=202.101.172.35
[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 ens33
10.0.0.0 0.0.0.0 255.255.255.0 U 100 0 0 ens33
[root@rs2 ~]# yum -y install httpd
[root@rs2 ~]# systemctl enable --now httpd
Created symlink from /etc/systemd/system/multi-user.target.wants/httpd.service to /usr/lib/systemd/system/httpd.service.
[root@rs2 ~]# hostname -I > /var/www/html/index.html
[root@rs2 ~]# curl 10.0.0.17
10.0.0.17
[root@rs2 ~]# ping 192.168.0.6 -c1
PING 192.168.0.6 (192.168.0.6) 56(84) bytes of data.
64 bytes from 192.168.0.6: icmp_seq=1 ttl=63 time=1.10 ms
#LVS 的网络配置
[root@lvs ~]# hostname
lvs.yezeng.org
[root@lvs ~]# hostname -I
10.0.0.8
[root@lvs ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens33
DEVICE=ens33
NAME=ens33
BOOTPROTO=static
IPADDR=10.0.0.8
PREFIX=24
GATEWAY=10.0.0.200
ONBOOT=yesi
DNS1=202.101.172.35
[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 ens33
10.0.0.0 0.0.0.0 255.255.255.0 U 100 0 0 ens33
[root@lvs ~]# ping 192.168.0.6 -c1
PING 192.168.0.6 (192.168.0.6) 56(84) bytes of data.
64 bytes from 192.168.0.6: icmp_seq=1 ttl=63 time=0.511 ms
1.2 后端RS的IPVS配置
#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
[root@rs1 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet 10.0.0.100/0 scope global lo:1
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:7f:49:eb brd ff:ff:ff:ff:ff:ff
inet 10.0.0.7/24 brd 10.0.0.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe7f:49eb/64 scope link
valid_lft forever preferred_lft forever
#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
[root@rs2 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet 10.0.0.100/0 scope global lo:1
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:15:d6:29 brd ff:ff:ff:ff:ff:ff
inet 10.0.0.17/24 brd 10.0.0.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe15:d629/64 scope link
valid_lft forever preferred_lft forever
1.3 LVS 主机的配置
#在LVS上添加VIP
[root@lvs ~]# ifconfig lo:1 10.0.0.100/32
[root@lvs ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet 10.0.0.100/0 scope global lo:1
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:6c:c2:ce brd ff:ff:ff:ff:ff:ff
inet 10.0.0.8/24 brd 10.0.0.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe6c:c2ce/64 scope link
valid_lft forever preferred_lft forever
[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 -g
[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
1.4 测试访问
[root@internet ~]# curl 10.0.0.100
10.0.0.17
[root@internet ~]# curl 10.0.0.100
10.0.0.7
[root@rs1 ~]# tail -f /var/log/httpd/access_log -n0
192.168.0.6 - - [10/Jul/2021:07:46:19 +0800] "GET / HTTP/1.1" 200 10 "-" "curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.27.1 zlib/1.2.3 libidn/1.18 libssh2/1.4.2"
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