Linux-centos下安装keepalived

1.安装依赖
yum -y install kernel-devel*
yum -y install openssl-*
yum -y install popt-devel
yum -y install lrzsz
yum -y install openssh-clients
2.安装keepalived（资料：链接：http://pan.baidu.com/s/1i5lANUd 密码：2ji8）
2.1.上传
1、cd /usr/local
2、rz –y
3、选择keepalived安装文件
2.2.解压
tar –zxvf keepalived-1.2.15.tar.gz
2.3.重命名
mv keepalived-1.2.15 keepalived
2.4.安装keepalived
1、cd keepalived
2、执行命令
./configure --prefix=/usr/local/keepalived -enable-lvs-syncd --enable-lvs --with-kernel-dir=/lib/modules/2.6.32-431.el6.x86_64/build
3、编译
make
4、安装
make install
2.5.配置服务和加入开机启动
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/ 
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
mkdir -p /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
ln -s /usr/local/keepalived/sbin/keepalived /sbin/
chkconfig keepalived on
2.6.修改配置文件
1、vi /etc/keepalived/keepalived.conf

2、详解：

global_defs {    notification_email {#指定keepalived在发生切换时需要发送email到的对象，一行一个      #[e-mail]      #[e-mail]      #[e-mail]    }    notification_email_from [e-mail]#指定发件人    #smtp_server 192.168.200.1#指定smtp服务器地址    #smtp_connect_timeout 30 #指定smtp连接超时时间    router_id LVS_DEVEL#运行keepalived机器的一个标识 } vrrp_instance VI_1 {     state BACKUP#指定那个为master，那个为backup     interface eth1#设置实例绑定的网卡     virtual_router_id 51#同一实例下virtual_router_id必须相同     priority 100#定义优先级，数字越大，优先级越高,备机要小于主 advert_int 1#MASTER与BACKUP负载均衡器之间同步检查的时间间隔，单位是秒 nopreempt#设置为不抢占,从启动后主不会自动切换回来, 注：这个配置只能设置在backup主机上，而且这个主机优先级要比另外一台高          authentication {#设置认证         auth_type PASS         auth_pass 1111     }     virtual_ipaddress {#设置vip         192.168.56.70#虚拟IP     } } virtual_server 192.168.56.70 8080 {     delay_loop 6#健康检查时间间隔     lb_algo rr #调度算法rr|wrr|lc|wlc|lblc|sh|dh     lb_kind DR #负载均衡转发规则NAT|DR|RUN     #nat_mask 255.255.255.0 #需要验证     persistence_timeout 1#会话保持时间     protocol TCP#使用的协议     real_server 192.168.56.201 8080 {         weight 10 #默认为1,0为失效         SSL_GET {             url { #检查url，可以指定多个               path /               digest ff20ad2481f97b1754ef3e12ecd3a9cc #检查后的摘要信息             }             url {               path /mrtg/               digest 9b3a0c85a887a256d6939da88aabd8cd             }             connect_timeout 3#连接超时时间             nb_get_retry 3#重连次数             delay_before_retry 3#重连间隔时间         }     } }

3.按照上面步骤安装备机器
注意：备的配置文件不相同。

4.两台机器启动keepalived：
service keepalived start
5.验证
ip a
6.监控
因为keepalive只能监控机器的死活，所以当软件死掉后，keepalived仍然不会切换；
所以需要写一个脚本，监控软件的死活。
运行wangsf.sh，监控软件

7.补充：
1.主节点配置文件

! Configuration File for keepalived global_defs {    notification_email {      #[e-mail]      #[e-mail]      #[e-mail]    }    notification_email_from [e-mail]    #smtp_server 192.168.200.1    #smtp_connect_timeout 30    router_id LVS_DEVEL } vrrp_instance VI_1 {     state MASTER     interface eth1     virtual_router_id 51     priority 200     advert_int 1     authentication {         auth_type PASS         auth_pass 1111     }     virtual_ipaddress {         192.168.56.70         #192.168.200.17         #192.168.200.18     } } virtual_server 192.168.56.70 8080 {     delay_loop 6     lb_algo rr     lb_kind DR     #nat_mask 255.255.255.0     persistence_timeout 1     protocol TCP real_server 192.168.56.200 8080 {         weight 20         SSL_GET {             url {               path /               digest ff20ad2481f97b1754ef3e12ecd3a9cc             }             url {               path /mrtg/               digest 9b3a0c85a887a256d6939da88aabd8cd             }             connect_timeout 3             nb_get_retry 3             delay_before_retry 3         }     } }

2.备节点配置文件

! Configuration File for keepalived global_defs {    notification_email {      #[e-mail]      #[e-mail]      #[e-mail]    }    notification_email_from [e-mail]    #smtp_server 192.168.200.1    #smtp_connect_timeout 30    router_id LVS_DEVEL } vrrp_instance VI_1 {     state BACKUP     interface eth1     virtual_router_id 51     priority 100 nopreempt     advert_int 1     authentication {         auth_type PASS         auth_pass 1111     }     virtual_ipaddress {         192.168.56.70     } } virtual_server 192.168.56.70 8080 {     delay_loop 6     lb_algo rr     lb_kind DR     #nat_mask 255.255.255.0     persistence_timeout 1     protocol TCP real_server 192.168.56.201 8080 {         weight 20         SSL_GET {             url {               path /               digest ff20ad2481f97b1754ef3e12ecd3a9cc             }             url {               path /mrtg/               digest 9b3a0c85a887a256d6939da88aabd8cd             }             connect_timeout 3             nb_get_retry 3             delay_before_retry 3         }     } }

3.wangsf.sh脚本内容

#!/bin/bash while true; do     A=`ps -ef|grep tomcat |wc -l` B=`ps -ef|grep keepalived |wc -l` echo $A if [ $A -eq 1 ];then                 echo 'restart tomcat!!!!'                 /usr/local/server/apache-tomcat-6.0.37/bin/startupsss.sh if [ $A -eq 1 ];then if [ $B -gt 1 ];then   echo 'tomcat dead  !!!! kill keepalived'   killall keepalived fi fi fi if [ $A -eq 2 ];then if [ $B -eq 1 ];then   echo 'tomcat live  !!!! start keepalived'   service keepalived start fi fi sleep 3 done