LVS+PIRANHA实现负载均衡
1、安装lvs和piranha：yum –yinstall piranha，会自动安装ipvsadm及相关依赖
http://blog.iyunv.com/ppt0501/article/details/
2、启动piranha：servicepiranha-gui start
Piranha配置界面，启动端口为3636
3、为piranha设置密码（用户名是：piranha，密码也设置为piranha）:piranha-passwd：
http://blog.iyunv.com/ppt0501/article/details/
4、配置lvs的从机：
http://blog.iyunv.com/ppt0501/article/details/
Redundant server public IP //备份的ip
Heartbeat interval (seconds) //心跳间隔（秒）
Assume dead after (seconds) //多长时间确定死亡转移
Heartbeat runs on port //heartbeat运行的端口
5、配置虚拟服务：
http://blog.iyunv.com/ppt0501/article/details/
http://blog.iyunv.com/ppt0501/article/details/
http://blog.iyunv.com/ppt0501/article/details/
http://blog.iyunv.com/ppt0501/article/details/
http://blog.iyunv.com/ppt0501/article/details/
http://blog.iyunv.com/ppt0501/article/details/
6、启动lvs：servicepulse start
http://blog.iyunv.com/ppt0501/article/details/
Lvs主机自动加上虚拟ip：ifconfig
http://blog.iyunv.com/ppt0501/article/details/
7、lvs服务器开启转发：
编辑/etc/sysctl.conf文件，把net.ipv4.ip_forward = 1改为1（支持转发），执行sysctl –p生效。
8、 为realserver配置虚拟ip，在/etc/sysconfig/network-scripts增加一块网卡：ifcfg-lo:0内容为：
http://blog.iyunv.com/ppt0501/article/details/
9、 no-arp：
vi /etc/sysctl.conf
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_announce = 2
sysctl -p
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