keepalived+mysql+tomcat

1、keepalived+mysql
搭建mysql集群+keepalived高可用
2、安装tomcat(自行安装，这里不赘述)
3、配置keepalived.conf

vi /etc/keepalived/keepalived.conf

在配置文件下方添加：

virtual_server 192.168.131.150 8080 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    persistence_timeout 60
    protocol TCP
    real_server 192.168.131.131 8080 {
        weight 3
        TCP_CHECK {
          connect_timeout 3
          nb_get_retry 3
          delay_before_retry 3
          connect_port 8080
        }
    }
    real_server 192.168.131.132 8080 {
        weight 3
        TCP_CHECK {
          connect_timeout 3
          nb_get_retry 3
          delay_before_retry 3
          connect_port 8080
        }
    }
}

4、开启tomcat
进入tomcat目录运行

./bin/startup.sh

5、开启keepalived
/etc/init.d/keepalived start

6、测试
随意修改主页一处位置：
vi /usr/local/tomcat/webapps/ROOT/index.jsp

在外网上访问192.168.131.150:8080,出现192.168.131.132的tomcat主页

在192.168.131.132中关闭tomcat

ps aux|grep tomcat
kill -9 'pid'

外网上重新访问192.168.131.150:8080,出现192.168.131.131的tomcat主页

在192.168.131.132中重新开启tomcat

/usr/local/tomcat/bin/startup.sh 

外网上重新访问192.168.131.150:8080,又出现192.168.131.132的tomcat主页(这里要从131的主页变为132的主页可能需要一段时间)