lvs+keepalived配置高可用集群

erqe211

说明：
   上周使用keepalived实现了mysql主主同步的高可用，借着刚研究了keepalived，顺便把lvs集群搞一下










环境：

前段LB	后端web	底端共享存储	vip
（主）192.168.186.132	（R1）192.168.186.128	192.168.186.131	192.168.186.150
（备）192.168.186.133	（R2）192.168.186.129

步骤：
  安装keepalived：
      在（主）192.168.186.132和（备）192.168.186.133分别进行如下操作：
     安装keepalived：
      cd /usr/local/src/
      wget http://www.keepalived.org/software/keepalived-1.2.15.tar.gz
      tar -zxf keepalived-1.2.15.tar.gz
      cd keepalived-1.2.15
      ./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.32-504.16.2.el6.i686/
      make
      make install
      注意：--with-kernel-dir=/usr/src/kernels/2.6.32-504.16.2.el6.i686/ 这个选项一定要加；这个选项并不是把keepalived编译进内核，而是指定使用内核源码中的头文件，即include目录（只有在配置lvs时才用此选项，其他时候不需要）


      拷贝文件：

      cp -a /usr/local/keepalived/etc/rc.d/init.d/keepalived  /etc/init.d/
      cp -a /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
      mkdir /etc/keepalived/
      cp -a /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
      cp -a /usr/local/keepalived/sbin/keepalived /usr/sbin/
      注意：/etc/sysconfig/keepalived 和 /etc/keepalived/keepalived.conf 的路径一定要正确，因为在执行/etc/init.d/keepalived这个启动脚本时，会读取/etc/sysconfig/keepalived 和 /etc/keepalived/keepalived.conf 这两个文件


      配置keepalived：      
      mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.old
      vi /etc/keepalived/keepalived.conf            #主LB

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

! Configuration File for keepalived global_defs {     notification_email {       732233048@qq.com     }     notification_email_from root@localhost     smtp_server 127.0.0.1     smtp_connect_timeout 30     router_id lvs }    vrrp_instance VI_1 {     state master     interface eth0     virtual_router_id 51     priority 150     advert_int 1     #nopreempt     authentication {         auth_type PASS         auth_pass 1111     }     virtual_ipaddress {         192.168.186.150     } }    virtual_server 192.168.186.150 80 {     delay_loop 6     lb_algo wrr     lb_kind DR     persistence_timeout 50     protocol TCP     real_server 192.168.186.128 80 {         weight 3         TCP_CHECK {             connect_timeout 10             nb_get_retry 3             delay_before_retry 3         }     }     real_server 192.168.186.129 80 {         weight 2         TCP_CHECK {             connect_timeout 10             nb_get_retry 3             delay_before_retry 3         }     } }

      在（备）192.168.186.133，对配置文件做如下修改：
      将state master改为state backup
      将priority 150改为priority 100
      注意：在配置keepalived.conf时，要特别注意配置文件的语法格式，因为keepalived在启动的时候不会去检测配置文件的正确性，即使没有配置文件，keepalived也可以正常启动