lvs+dr模式（关键操作）

1）  keepalived配置
#给出部分参考配置
1.10
 
! Configuration File for keepalived
global_defs {
  lvs_id BACKUP
}
vrrp_sync_group MAIL {
    group {
       VI_1_500
    }
}
 
vrrp_instance VI_1_500 {
         state BACKUP
    interface eth0
    virtual_router_id 95
  #1.98的优先级设置为100
priority 150  
    advert_int 5
    authentication {
        auth_type PASS
        auth_pass 1111
    }
      virtual_ipaddress {
      192.168.1.96/24
      192.168.1.97/24
    }
}
 
 
###############################################################
#this virtual server is the setting of Email Server SMTP port
###############################################################
 
virtual_server 192.168.1.97 25 {
   delay_loop 6
   lb_algo rr
   lb_kind DR
   persistence_timeout 50
   protocol TCP
 
   real_server 192.168.1.99 25 {
       weight 1
       TCP_CHECK {
              connect_timeout 3
              nb_get_retry 3
              delay_before_retry 3
              connect_port 25
            }
   }
}