nginx+keepalive实现高可用负载均衡方案

#################
....
upstream? www.xxx.com? {
server?? 172.26.11.73:8080 max_fails=1;#max_fails 表示健康检查失败的次数，这里表示次数为一次，即标记该服务器down了
server?? 172.26.11.74:8080 max_fails=1;
}
server
{
listen? 80;
server_name? www.xxx.com;
location / {
proxy_next_upstream error timeout http_500 http_502 http_504;? #这里表示健康检查涉及到的情形，有这些情形的，都切换到另外的web服务器访问
proxy_read_timeout 10s;?? #这里表示程序返回的时间，请参考php.ini的max_exe_time来设置。
proxy_pass??????? http://www.xxx.com;
proxy_set_header?? Host???????????? $host;
proxy_set_header?? X-Real-IP??????? $remote_addr;
proxy_set_header?? X-Forwarded-For? $proxy_add_x_forwarded_for;
}
#access_log? /var/log/nginx/xxx.log;
}
##########################

#安装 popt
yum -y install popt popt-devel
cd /data/software
wget http://www.keepalived.org/software/keepalived-1.2.8.tar.gz
cd /data/src
tar zxf ../software/keepalived-1.2.8.tar.gz
cd keepalived-1.2.8
./configure --prefix=/usr/local/keepalived --sysconf=/etc
make && make install
cp /usr/local/keepalived/sbin/keepalived /bin/
chkconfig --add keepalived
#设置开机启动
chkconfig keepalived on
#启动keepalive服务
/etc/init.d/keepalived start

! Configuration File for keepalived
global_defs {
	notification_email {
	admin@test.com
	}
	notification_email_from admin@test.com
	smtp_server xxx.smtp.com
	smtp_connect_timeout 30
	router_id LVS_DEVEL
}
vrrp_script Monitor_Nginx {
	 script "/root/monitor_nginx.sh"
	 interval 2
	 weight 2
}
vrrp_instance VI_1 {
	state MASTER #(主机为MASTER，备用机为BACKUP)
	interface eth0 #(HA监测网络接口)
	virtual_router_id 61 #(主、备机的virtual_router_id必须相同)
	#mcast_src_ip 172.26.11.99 #(多播的源IP，设置为本机外网IP，与VIP同一网卡)此项可不设置
	priority 90 #(主、备机取不同的优先级，主机值较大，备份机值较小,值越大优先级越高)
	advert_int 1 #(VRRP Multicast广播周期秒数)
	authentication {
	auth_type PASS #(VRRP认证方式)
	auth_pass 1234 #(密码)
	}
	track_script {
	Monitor_Nginx #(调用nginx进程检测脚本)
	}
	virtual_ipaddress {
	172.26.11.101 #(VRRP HA虚拟地址)
	}
}

#!/bin/bash
if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]
 then
 killall keepalived
fi