CentOS Keepalived配置

借助 Keepalived 完成VIP配置

  • 在网关节点安装 Keepalived
  1. $ yum install -y keepalived

  • 编辑配置文件

    注意！当前调用健康监测脚本内容为注释状态，原因是在安装 Rainbond 前 需要确保 VIP 已经存在；在 Rainbond 安装完成之后需将注释取消，才能实现健康监测，确保 网关高可用。

    • 主节点
  1. $ vi /etc/keepalived/keepalived.conf
  3. ! Configuration File for keepalived
  5. global_defs {
  6.    router_id LVS_DEVEL
  7. }
  8. #vrrp_script check_gateway {
  9. # 检测脚本
  10. #   script "/etc/keepalived/check_gateway_status.sh"
  11. # 执行间隔时间
  12. #   interval 5
  13. #}
  14. vrrp_instance VI_1 {
  16.     #因使用非抢占模式，这里都为backup
  17.     state BACKUP 
  18.     #网卡设备名，通过 ifconfig 命令确定  
  19.     interface ens6f0       
  20.     virtual_router_id 51
  21.     #优先级，主节点大于备节点     
  22.     priority 100    
  23.     advert_int 1
  24.     #非抢占模式
  25.     nopreempt
  26.     authentication {
  27.         auth_type PASS
  28.         auth_pass 1111
  29.     }
  30.     virtual_ipaddress {
  31.         <VIP>               
  32.      }
  33. #     track_script {
  34. #    check_gateway
  35. #   }
  36. }
  • 从节点
  1. $ vi /etc/keepalived/keepalived.conf
  3. ! Configuration File for keepalived
  5. global_defs {
  6.    router_id LVS_DEVEL
  7. }
  8. #vrrp_script check_gateway {
  9. # 检测脚本
  10. #  script "/etc/keepalived/check_gateway_status.sh"
  11. # 执行间隔时间
  12. #  interval 5
  13. #  }    
  14.     vrrp_instance VI_1 {
  15.     #因使用非抢占模式，这里都为backup
  16.     state BACKUP 
  17.     #网卡设备名，通过 ifconfig 命令确定   
  18.     interface ens6f0
  19.     virtual_router_id 51
  20.     #优先级，主节点大于备节点   
  21.     priority 50
  22.     advert_int 1
  23.     #非抢占模式
  24.     nopreempt
  25.     authentication {
  26.         auth_type PASS
  27.         auth_pass 1111
  28.     }
  29.     virtual_ipaddress {
  30.         <VIP>           
  31.     }
  32. #     track_script {
  33. #    check_gateway
  34. #   }
  35. }

  • 健康监测脚本

    扩展对网关节点健康检查的脚本，脚本的功能是当 rbd-gateway 组件停止服务，则关闭本机的 Keepalived，切换 VIP 。(主从都需操作)

  1. $ vi /etc/keepalived/check_gateway_status.sh 
  3. #!/bin/bash                                                                                             
  4. /usr/bin/curl -I http://localhost:10254/healthz 
  6. if [ $? -ne 0 ];then
  8.      cat /var/run/keepalived.pid | xargs kill
  10. fi

添加执行权限

  1. $ chmod +x /etc/keepalived/check_gateway_status.sh

  • 更改 Keepalived systemd 配置文件，添加两项配置

    添加两项参数

  1. $  vi /lib/systemd/system/keepalived.service
  3. # /lib/systemd/system/keepalived.service
  4. [Unit]
  5. Description=Keepalive Daemon (LVS and VRRP)
  6. After=network-online.target
  7. Wants=network-online.target
  8. # Only start if there is a configuration file
  9. ConditionFileNotEmpty=/etc/keepalived/keepalived.conf
  10. [Service]
  11. Type=forking
  12. KillMode=process
  13. PIDFile=/var/run/keepalived.pid
  14. # Read configuration variable file if it is present
  15. EnvironmentFile=-/etc/default/keepalived
  16. ExecStart=/usr/sbin/keepalived $DAEMON_ARGS
  17. ExecReload=/bin/kill -HUP $MAINPID
  18. # 总是重启该服务
  19. Restart=always
  20. # 重启间隔时间
  21. RestartSec=10
  23. [Install]
  24. WantedBy=multi-user.target

  • 启动服务

    启动服务并设置开机自启动

  1. systemctl start keepalived
  2. systemctl enable keepalived
  3. systemctl status keepalived
  • 检测 VIP 是否启动
  1. ip a |grep <VIP>

在进行下一步操作前请确保 VIP 已经存在，如果 VIP 不存在，请重新审查本节操作；在 Rainbond 安装完成之后请将配置文件中注释取消并重启 Keepalived 服务，实现健康监测，以此确保 网关高可用。