環境采集cenots 6.3 64位迷你安裝，因為安裝前，你需要做一些工作
yum install -y make wget
如果你願意可以更新下系統，更換下yum源.
1.安裝keepalive
官方最新版 keepalived-1.2.7
tar zxvf keepalived-1.2.7.tar.gz
cd keepalived-1.2.7
在此之前。請安裝一下一些簡單的工具
yum install -y gcc openssl-devel popt-devel
不然會編譯不成功的。
然後
./configure
make && make install
cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
chmod +x /etc/init.d/keepalived
chkconfig --add keepalived
chkconfig keepalived on
mkdir /etc/keepalived
ln -s /usr/local/sbin/keepalived /usr/sbin/
2.安裝nginx
nginx-1.2.5.tar.gz
tar zxvf nginx-1.2.5.tar.gz
cd nginx-1.2.5
安裝一下相關組件.
yum install -y pcre-devel
./configure --prefix=/usr/local/nginx --user=www --group=www --with-http_stub_status_module --with-http_ssl_module
make && make install
3.配置keepalive
兩台服務器端keepalived.conf內容都為如下，都設置為backup，不搶占，注意修改優先級不同,更詳細的keepalived配置文件說明可以執行man keepalived.conf查看：
! Configuration File for keepalived
global_defs {
notifi
cation_email {
[email protected]
}
notification_email_from
[email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
#監控服務.NGINX mysql等
vrrp_script chk_nginx {
script "/home/check_nginx.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state BACKUP #主從設置 MASTER
interface eth2 #網卡名
virtual_router_id 51
mcast_src_ip 10.0.1.133 #本機IP
priority 50 #從機小於主機
advert_int 1
authentication {
auth_type PASS
auth_pass ch
topnet
}
virtual_ipaddress {
10.0.1.2 #VIP 的IP
}
track_script {
chk_nginx #檢測腳本
}
}
virtual_server 10.0.1.2 80 {
delay_loop 6
lb_algo rr
lb_kind DR
persistence_timeout 50
protocol TCP
real_server 10.0.1.132 80 {
weight 3
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 10.0.1.133 80 {
weight 3
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
啟動相關服務。我在這兒使用的是nginx ，每個上面開了一個站點，通過IP可以直接訪問的。啟動keepalive後，就可以通過VIP的虛擬IP 10.0.1.2來訪問站點了，測試方法就是 停止任何其中一個站點，看它是否能自動切換到從服務器上。
上面代碼中 nginx的檢測腳本如下 ：
#!/bin/bash
if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]
then
/usr/local/nginx/sbin/nginx
sleep 5
if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]
then
killall keepalived
fi
fi
在兩台Web Server上執行realserver.sh腳本，為lo:0綁定VIP地址10.0.1.2、抑制ARP廣播。
#!/bin/bash
#description: Config realserver
VIP=10.0.1.2
/etc/rc.d/init.d/functions
case "$1" in
start)
/sbin/ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP
/sbin/route add -host $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)
/sbin/ifconfig lo:0 down
/sbin/route del $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
echo "RealServer Stoped"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit 0
分別在主從機上執行 sh realserver.sh start 就可實現負載均衡及高可用集群
