LVS+Keepalived負載均衡集羣之DR模式
一、環境
5臺虛擬機，分別是：
1臺測試機（192.168.3.111）;
2臺DirectorServer（192.168.3.221、192.168.3.222）;
2臺RealServer（192.168.3.231、192.168.3.232）;
注：VIP本實驗設置爲：192.168.3.220
二、安裝配置RealServer
yum -y install httpd
chkconfig httpd on
echo 'R1/R2' /var/www/html/index.html #兩臺的配置都一樣，這步爲了區別訪問的是哪臺的數據，所以分爲R1與R2，生產機上一般是統一訪問後端的數據層的數據；
service httpd start
#!/bin/bash
SNS_VIP=192.168.3.220
. /etc/rc.d/init.d/functions
case "$1" in
start)
ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
/sbin/route add -host $SNS_VIP dev lo:0
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
sysctl -p >/dev/null 2>&1
echo "RealServer Start OK"
;;
stop)
ifconfig lo:0 down
route del $SNS_VIP > dev/null 2>&1
echo "0" > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" > /proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" > /proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" > /proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p >/dev/null 2>&1
echo "RealServer Stoped"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit 0複製以上內容丟到/etc/init.d/ 目錄下，命名自定義，我是命名爲:realserver.sh
chmod u+x /etc/init.d/realserver.sh
ln -s /etc/init.d/realserver.sh /etc/rc.d/rc3.d/S99realserver.sh #設置開機自啓動
/etc/init.d/realserver.sh start
三、安裝配置DirectorServer
yum -y install gcc kernel-devel openssl-devel lrzsz vim ipvsadm
wget http://www.keepalived.org/software/keepalived-1.2.15.tar.gz
tar xzvf keepalived-1.2.15.tar.gz
cd keepalived-1.2.15
./configure --sysconf=/etc/ --with-kernel-dir=/usr/src/kernels/2.6.32-504.23.4.el6.x86_64/
make
make install
ln -s /usr/local/sbin/keepalived /sbin/
cd /etc/keepalived/
cp keepalived.conf keepalived.conf.bak
編輯keepalived.conf，內容大致如下:
! Configuration File for keepalived
global_defs {
notification_email {
[email protected]
}
notification_email_from [email protected]
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.3.220
}
}
virtual_server 192.168.3.220 80 {
delay_loop 6
lb_algo wlc
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 50
protocol TCP
real_server 192.168.3.231 80 {
weight 2
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.3.232 80 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}注：第二臺DS服務器（備）需要更改以上兩處的內容，一是把MASTER更改爲BACKUP，二是把優先級由100改爲80即可；
四、校驗及測試
4.1、ipvsadm -L -n #正常顯示VIP及RIP等內容；
4.2、ip addr list #主服務器正常顯示VIP,備服務器沒有VIP；
4.3、把主服務器關機，看備服務器會不會把服務接管過來；