Keepalived+HAProxy配置高可用负载均衡,解决keepalived无法安装问题

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1 系统环境
　　Keepalived-1.2.2 ：http://www.keepalived.org/software/keepalived-1.2.2.tar.gz
　　OS: CentOS 5.7
　　HAProxy：http://haproxy.1wt.eu/download/1.4/src/haproxy-1.4.20.tar.gz
　　我的ip环境：

haproxy keepalived 主：192.168.200.104:1080

haproxy keepalived 备：192.168.200.101:1080

vip：192.168.200.181

web：192.168.200.104:8080 192.168.200.104:9090

2 Keepalived安装
　　1.tar -zxvf keepalived-1.2.2.tar.gz
　　2.cd keepalived-1.2.2
　　3../configura --prefix=/

执行这一步可能出现如下错误：
configure: error:
!!! OpenSSL is not properly installed on your system. !!!
!!! Can not include OpenSSL headers files.
解决办法：
[iyunv@master ~]# yum -y install openssl-devel

　　


　　4.make && make install

5.cd /etc/keepalived/

6.mv keepalived.conf keepalived.conf.default

7.vi keepalived.conf

vrrp_script chk_http_port {
script /etc/keepalived/check_haproxy.sh"
Interval 2
weight 2
global_defs {
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER #192.168.200.104，在192.168.200.101上则改为BACKUP
interface eth0
virtual_router_id 51
priority 200 #192.168.200.104，在192.168.200.101上则改为100   
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_http_port
}
virtual_ipaddress {
192.168.200.181
}
}

　　8.vi /etc/keepalived/check_haproxy.sh

#!/bin/bash
A=`ps -C haproxy --no-header |wc -l`
if [ $A -eq 0 ];then
/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/haproxy.cfg
sleep 3
if [ `ps -C haproxy --no-header |wc -l` -eq 0 ];then
/etc/init.d/keepalived stop
fi
fi

　　

9.chmod 755 /etc/keepalived/check_haproxy.sh

3 安装HAProxy
　　haproxy的安装见链接：http://blog.iyunv.com/zilong00007/article/details/7275235

4 测试
　　1./etc/init.d/keepalived start （这条命令会自动把haproxy启动）
　　2.停掉主上的haproxy，3秒后keepalived会自动将其再次启动

3.停掉主的keepalived，备机马上接管服务

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