Keepalived 部署主备切换

Keepalived 部署主备切换

一个使用 Keepalived 部署主备切换服务的简单示例。

1. 分别在主备服务器安装 keepalived： sudo yum install keepalived

2. 备份 keepalived 原始配置文件： sudo mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak

3. 修改 keepalived 配置： sudo vim /etc/keepalived/keepalived.conf

   • 主服务器配置：

     global_defs {
         router_id MASTER_SERVER
     }
     
     vrrp_script check_service {
         script "/etc/keepalived/check_service.sh"
         interval 1
         fall 1
         rise 1
         weight -50
     }
     
     vrrp_instance VI_1 {
         state MASTER
         interface eth0
         virtual_router_id 51
         priority 100
         advert_int 1
     
         authentication {
             auth_type PASS
             auth_pass 2333
         }
     
         virtual_ipaddress {
             10.1.2.53  # VIP
         }
     
         track_script {
             check_service
         }
     }
     
     

   • 备服务器配置

     global_defs {
         router_id BACKUP_SERVER
     }
     
     vrrp_script check_service {
         script "/etc/keepalived/check_service.sh"
         interval 1
         fall 1
         rise 1
         weight -50
     }
     
     vrrp_instance VI_1 {
         state BACKUP
         interface eth0
         virtual_router_id 51
         priority 80
         advert_int 1
     
         authentication {
             auth_type PASS
             auth_pass 2333
         }
     
         virtual_ipaddress {
             10.1.2.53  # VIP
         }
     
         track_script {
             check_service
         }
     }
     
     

4. 主备服务器都添加服务检查脚本： sudo vim /etc/keepalived/check_service.sh

   #!/bin/bash
   
   # 检查服务状态
   server_status=$(curl -s http://127.0.0.1/server_status/)
   if [[ "$server_status" =~ "running" ]];then
       exit 0
   else
       exit 1
   fi
   
   

5. 添加执行检查脚本用户： sudo useradd -r -s /sbin/nologin keepalived_script

6. 设置检查脚本权限：

   • sudo chown root:keepalived_script /etc/keepalived/check_service.sh
   • sudo chmod 750 /etc/keepalived/check_service.sh

7. 启动 keepalived 服务： sudo systemctl start keepalived

8. 检查 keepalived 服务状态： sudo systemctl status keepalived

9. 检查 vip 地址是否绑定： ip a

10. 使用 vip 访问服务： curl http://10.1.2.53/server_status/