配置Keepalived

操作步骤

1. 后台执行以下命令，修改/etc/keepalived/keepalived.conf文件，配置LVS主节点keepalived。

   vi /etc/keepalived/keepalived.conf

   ! Configuration File for keepalived
    
   global_defs {
       router_id master_node
   }
    
   local_address_group laddr_gl {
       192.168.0.157  # LVS主节点地址
   }
    
   vrrp_instance VI_1 {
       state MASTER
       interface eth0
       virtual_router_id   51
       priority 100
       advert_int   1
       authentication {
           auth_type PASS
           auth_pass 123456
       }
       virtual_ipaddress {
           192.168.0.27
   }
   notify_master "/etc/keepalived/notify.sh master"
   notify_backup "/etc/keepalived/notify.sh backup"
   }
    
   # 虚拟ip 端口
   virtual_server 192.168.0.27 80 { 
       delay_loop 6
       lb_algo rr
       lb_kind FNAT
       protocol TCP
       laddr_group_name laddr_gl
   #后端服务节点
       real_server 192.168.0.3 80 {
           weight 1
           TCP_CHECK {
               connect_timeout 15
               connect_port 80
               nb_get_retry 5
               delay_before_retry 3
           }
       }
       real_server 192.168.0.46 80 {
           weight 1
           TCP_CHECK {
               connect_timeout 15
               connect_port 80
               nb_get_retry 5
               delay_before_retry 3
           }
       }
   }

2. 后台执行以下命令，修改/etc/keepalived/keepalived.conf文件，配置LVS备节点keepalived。

   vi /etc/keepalived/keepalived.conf

   ! Configuration File for keepalived
    
   global_defs {
       router_id master_node
   }
    
   local_address_group laddr_gl {
       192.168.0.234  #本机地址
   }
    
   vrrp_instance VI_1 {
       state BACKUP
       interface eth0
       virtual_router_id   51
       priority 99  # 需要比主节点低
       advert_int   1
       authentication {
           auth_type PASS
           auth_pass 123456
       }
       virtual_ipaddress {
           192.168.0.27
   }
   notify_master "/etc/keepalived/notify.sh master"
   notify_backup "/etc/keepalived/notify.sh backup"
   }
    
   virtual_server 192.168.0.27 80 {
       delay_loop 6
       lb_algo rr
       lb_kind FNAT
       protocol TCP
       laddr_group_name laddr_gl
       real_server 192.168.0.3 80 {
           weight 1
           TCP_CHECK {
               connect_timeout 15
               connect_port 80
               nb_get_retry 5
               delay_before_retry 3
           }
       }
       real_server 192.168.0.46 80 {
           weight 1
           TCP_CHECK {
               connect_timeout 15
               connect_port 80
               nb_get_retry 5
               delay_before_retry 3
           }
       }
   }

   

   步骤3~6，主备LVS节点均需执行。

3. 后台执行以下命令，修改/etc/keepalived/notify.sh文件。

   vi /etc/keepalived/notify.sh

   #!/bin/bash
    
   if [ $# -eq 0 ]
   then
       echo "input master/backup"
       exit 1
   fi
    
   case $1 in
   master)
           sed -i "s/#laddr_group_name/laddr_group_name/" /etc/keepalived/keepalived.conf 2>/dev/null
           systemctl reload keepalived.service
   ;;
   backup)
           if [ `grep "#laddr_group_name" /etc/keepalived/keepalived.conf|wc -l` -eq 0 ]
           then
               sed -i "s/laddr_group_name/#laddr_group_name/" /etc/keepalived/keepalived.conf 2>/dev/null
               systemctl reload keepalived.service
           fi
   ;;
   esac

   chmod +x /etc/keepalived/notify.sh

4. 执行以下命令，启动keepalived。

   systemctl start keepalived

5. 执行以下命令，查看配置是否下发成功。

   ipvsadm -Ln

   

   

   如果ipvsadm返回的服务器数量和实际不符，请排查监听后端服务器端口是否放通。

6. 执行以下命令，设置开机启动。

   systemctl enable keepalived.service