keepalived单实例实现高可用性

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　　keepalived
　　企业lvs负载均衡
　　1、hearbeart+lvs+ldirectord
　　hearbeart lvs切换
　　ldirectord 健康检查
　　2、lvs
　　3、redhat piranha
　　4、keepalived+lvs
　　负载不均
　　1、会话保持
　　2、lvs调度算法
　　3、节点的会话保持
　　keepalived(vrrp协议)
　　原理：keepalivedDirectors 之间故障切换是以vrrp（虚拟路由冗余网关协议）来实现，keepalivedDirectors 正常工作时，主Directors节点不断向备节点发送健康心中信息，表明自己还活着。一旦有变时，将会有备用节点接管主节点的资源。当主节点恢复时备节点还给主节点主控制权，备节点仍是备用接收心跳。
　　vrrp特点：
　　1、master and slave 竟选；通过多播。
　　2、slave接不到包时，便会接管。
　　3、slave多个时，通过优先级竞选。
　　1、healthcheck
　　2、failover
　　keepalived + lvs 负载均衡与高可用性服务实战
　　1、安装
　　下载
　　wget http://www.keepalived.org/software/keepalived-1.1.19.tar.gz
　　./configure
　　--3个Yes ok!
　　make
　　make install
　　[root@localhost keepalived-1.1.19]# cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/
　　[root@localhost keepalived-1.1.19]# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
　　[root@localhost keepalived-1.1.19]# mkdir /etc/keepalived -p
　　[root@localhost keepalived-1.1.19]# cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
　　[root@localhost keepalived-1.1.19]# cp /usr/local/sbin/keepalived /usr/sbin/
　　[root@localhost keepalived-1.1.19]# service keepalived start
　　#ps -ef | grep keep
　　#service keepalived stop
　　2、在10.0.0.9上安装lvs
　　同上文
　　modprobe ip_vs
　　lsmod | grep ip_vs
　　在10.0.0.9上安装keepalived
　　wget http://www.keepalived.org/software/keepalived-1.1.19.tar.gz
　　[root@localhost keepalived-1.1.19]# cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/
　　[root@localhost keepalived-1.1.19]# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
　　[root@localhost keepalived-1.1.19]# mkdir /etc/keepalived -p
　　[root@localhost keepalived-1.1.19]# cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
　　[root@localhost keepalived-1.1.19]# cp /usr/local/sbin/keepalived /usr/sbin/
　　[root@localhost keepalived-1.1.19]# service keepalived start
　　#ps -ef | grep keep
　　#service keepalived stop
　　rz keepalived.conf.2-dan
　　mv keepalived.conf keepalived.conf.bak
　　mv keepalived.conf.2-dan keepalived.conf
　　将vip:10.0.0.10
　　service keepalived restart
　　关闭iptables、selinux
　　一定要关闭原来的eth0:0
　　ifconfig eth0:0 down
　　3、测试
　　ip add | grep 0.10
　　在10.0.0.9
　　service keepalived stop
　　ping 来查看超时，发现很快又通了，这是因为备份lb上来了。