LVS DR 模式实现web负载均衡(iptables(DNAT)+lvs(DR) real server 使用内网ip)

goodmm

　　

2.1.1-web基本配置
web1配置
[root@web1 ~]# fdisk /dev/sdb
Command (m for help): n
Command action
  e  extended
  p  primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-130, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-130, default 130):
Using default value 130
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@web1 ~]# partx /dev/sdb

[root@web1 ~]# mkdir /www/bbs -pv
[root@web1 ~]# mkfs.ext4 /dev/sdb1
[root@web1 ~]# e2label /dev/sdb1 web
　　[root@web1 ~]# vim /etc/fstab
[root@web1 ~]# mount -a
[root@web1 ~]# echo "web1" >/www/bbs/test.html
[root@web1 ~]# vim /etc/httpd/conf/httpd.conf

[root@web2 ~]# service httpd start

web2网络配置

[root@web2 ~]# yum -y install httpd php php-mysql
[root@web2 ~]# mkdir -pv /www/bbs
[root@web2 ~]# echo "web2" >/www/bbs/test.html
[root@web2 ~]# vim /etc/httpd/conf/httpd.conf

[root@web2 ~]# service httpd start
[root@web2 ~]# chkconfig httpd on

2.1.2-Director配置
ifconfig eth0:1 172.16.100.80 broadcast 172.16.100.80 netmask 255.255.255.255 up
route add -host 172.16.100.80 dev eth0:1
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -F
iptables -Z
ipvsadm -C
ipvsadm -A -t 172.16.100.80:80 -s wlc
ipvsadm -a -t 172.16.100.80:80 -r 172.16.100.81 -g -w 1
ipvsadm -a -t 172.16.100.80:80 -r 172.16.100.82 -g -w 1

2.1.3-Realserver配置

ifconfig lo down
ifconfig lo up
echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
ifconfig lo:0 172.16.100.80 broadcast 172.16.100.80 netmask 255.255.255.255 up
route add -host 172.16.100.80 dev lo:0

2.1.4-集群服务测试
修改DNS
[root@ns1 ~]# sed -i 's/^\/80/' /var/named/innet.100.16.172.in-addr.arpa
[root@ns1 ~]# sed -i 's/\$/80/' /var/named/innet.sanyu.com.zone


[root@ns1 ~]# service named restart

集群服务内网测试

刷新后

集群服务公网测试
修改防火墙规则

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A PREROUTING -s 202.111.0.0/16 -d 202.111.100.100 -p tcp --dport 80 -j DNAT --to-destination 172.16.100.80
iptables -t nat -A PREROUTING -s 202.110.0.0/16 -d 202.110.100.100 -p tcp --dport 80 -j DNAT --to-destination 172.16.100.80
iptables -t nat -A PREROUTING -s 202.111.0.0/16 -d 202.111.100.100 -p tcp --dport 443 -j DNAT --to-destination 172.16.100.43:443
iptables -t nat -A PREROUTING -s 202.110.0.0/16 -d 202.110.100.100 -p tcp --dport 443 -j DNAT --to-destination 172.16.100.43:443
iptables -t nat -A PREROUTING -s 202.111.0.0/16 -d 202.111.100.100 -p tcp --dport 53 -j DNAT --to-destination 172.16.100.53
iptables -t nat -A PREROUTING -s 202.110.0.0/16 -d 202.110.100.100 -p tcp --dport 53 -j DNAT --to-destination 172.16.100.53
iptables -t nat -A PREROUTING -s 202.111.0.0/16 -d 202.111.100.100 -p udp --dport 53 -j DNAT --to-destination 172.16.100.53
iptables -t nat -A PREROUTING -s 202.110.0.0/16 -d 202.110.100.100 -p udp --dport 53 -j DNAT --to-destination 172.16.100.53

guest1网络配置

guest2网络配置

注意：网关未指向R1
测试结果

　　

　　

　　脚本：
　　
#!/bin/bash
#
# LVS script for VS/DR
#
. /etc/rc.d/init.d/functions
#
VIP=172.16.100.80
RIP1=172.16.100.81
RIP2=172.16.100.82
PORT=80
#
case "$1" in
start)         
/sbin/ifconfig eth0:1 $VIP broadcast $VIP netmask 255.255.255.255 up
/sbin/route add -host $VIP dev eth0:1
# Since this is the Director we must be able to forward packets
echo 1 > /proc/sys/net/ipv4/ip_forward
# Clear all iptables rules.
/sbin/iptables -F
# Reset iptables counters.
/sbin/iptables -Z
# Clear all ipvsadm rules/services.
/sbin/ipvsadm -C
# Add an IP virtual service for VIP 192.168.0.219 port 80
# In this recipe, we will use the round-robin scheduling method.
# In production, however, you should use a weighted, dynamic scheduling method.
/sbin/ipvsadm -A -t $VIP:80 -s wlc
# Now direct packets for this VIP to
# the real server IP (RIP) inside the cluster
/sbin/ipvsadm -a -t $VIP:80 -r $RIP1 -g -w 1
/sbin/ipvsadm -a -t $VIP:80 -r $RIP2 -g -w 2
/bin/touch /var/lock/subsys/ipvsadm &> /dev/null
;;
stop)
# Stop forwarding packets
echo 0 > /proc/sys/net/ipv4/ip_forward
# Reset ipvsadm
/sbin/ipvsadm -C
# Bring down the VIP interface
/sbin/ifconfig eth0:1 down
/sbin/route del $VIP
/bin/rm -f /var/lock/subsys/ipvsadm
echo "ipvs is stopped..."
;;
status)
if [ ! -e /var/lock/subsys/ipvsadm ]; then
echo "ipvsadm is stopped ..."
else
echo "ipvs is running ..."
ipvsadm -L -n
fi
;;
*)
echo "Usage: $0 {start|stop|status}"
;;
esac