lvs+keepalived配置高可用集群

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

参考文档：

lvs集群简介：http://732233048.blog.51cto.com/9323668/1617201

LVS、Nginx和HAProxy负载均衡区别：http://732233048.blog.51cto.com/9323668/1623375

环境：

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

! Configuration File for keepalived
global_defs {
    notification_email {
      [email protected]
    }
    notification_email_from [email protected]
    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