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Keepalived+nginx 实现负载均衡及高可用

分类： 系统运维

2015-12-29 21:42:33

keepalived 安装请参考另一篇“Keepalived安装配置范例”

1 Keepalived Master机器配置文件

点击(此处)折叠或打开

  1. ! Configuration File for keepalived

  3. global_defs {
  4.    notification_email {
  5.      acassen
  6.    }
  7.    notification_email_from xxxxxx@qq.com
  8.    smtp_server smtp.qq.com
  9.    smtp_connect_timeout 30
  10.    router_id LVS_DEVEL
  11. }

  13. vrrp_script nginx_check {
  14.     script "/root/nginx_check.sh"
  15.         interval 1
  16.   weight -60
  17. }

  19. vrrp_instance VI_1 {
  20.     state MASTER
  21.     interface eth0
  22.     virtual_router_id 51
  23.     priority 100
  24.     advert_int 1
  25.     authentication {
  26.         auth_type PASS
  27.         auth_pass 1111
  28.     }
  29.     virtual_ipaddress {
  30.         192.168.10.60/24 dev eth0 label eth0:1
  31.     }

  33.     track_script
  34.     {
  35.         nginx_check
  36.     }
  37. }
2  Keepalived Backup机器配置文件

点击(此处)折叠或打开

  1. ! Configuration File for keepalived

  3. global_defs {
  4.    notification_email {
  5.      acassen
  6.    }
  7.    notification_email_from xxxxxx@qq.com
  8.    smtp_server smtp.qq.com
  9.    smtp_connect_timeout 30
  10.    router_id LVS_DEVEL
  11. }

  13. vrrp_script nginx_check
  14. {
  15.     script "/root/nginx_check.sh"
  16.     interval 1 
  17.     weigh -60
  18. }

  20. vrrp_instance VI_1 {
  21.     state BACKUP
  22.     interface eth0
  23.     virtual_router_id 51
  24.     priority 80
  25.     advert_int 1
  26.     authentication {
  27.         auth_type PASS
  28.         auth_pass 1111
  29.     }
  30.     virtual_ipaddress {
  31.         192.168.10.60/24 dev eth0 label eth0:1
  32.     }

  34.     track_script
  35.     {
  36.         nginx_check
  37.     }

  39. }


点击(此处)折叠或打开

  1. ! Configuration File for keepalived

  3. global_defs {
  4.    notification_email {
  5.      acassen
  6.    }
  7.    notification_email_from xxxxxxxxx@qq.com
  8.    smtp_server smtp.qq.com
  9.    smtp_connect_timeout 30
  10.    router_id LVS_DEVEL
  11. }

  13. vrrp_script nginx_check
  14. {
  15.     script "/root/nginx_check.sh"
  16.     interval 1 ###检测时间间隔 1s###
  17.     weigh -60 ###如果条件成立，权重-60###
  18. }

  20. vrrp_instance VI_1 {
  21.     state BACKUP
  22.     interface eth0
  23.     virtual_router_id 51
  24.     priority 80
  25.     advert_int 1
  26.     authentication {
  27.         auth_type PASS
  28.         auth_pass 1111
  29.     }
  30.     virtual_ipaddress {
  31.         192.168.10.60/24 dev eth0 label eth0:1
  32.     }

  34.     track_script
  35.     {
  36.         nginx_check
  37.     }

  39. }
3  Nginx 检查脚本,并放到master与backup机器的/root目录下

点击(此处)折叠或打开

  1. [root@localhost ~]# cat /root/nginx_check.sh
  2. #!/bin/bash
  3. alive=`netstat -pant|awk '/0.0.0.0:80/&&/LISTEN/'|wc -l`
  4. if [ $alive -eq 1 ]; then
  5.     exit 0
  6. else
  7.     exit 1
  8. fi

4  测试，停止Master上的nginx，隔一会再启动nginx
  从日志中可以看出，
     1   当Nginx停止，Keepalived检测到"VRRP_Script(nginx_check) failed", 开始切换到backup机器，并将VIP从master中remove。
     2   当Nginx恢复，Keepalived检测到"VRRP_Script(nginx_check) succeeded, 开始切换到master机器，并添加VIP。

点击(此处)折叠或打开

  1. Dec 30 05:36:15 localhost Keepalived_vrrp[13636]: Configuration is using : 68820 Bytes
  2. Dec 30 05:36:15 localhost Keepalived_vrrp[13636]: Using LinkWatch kernel netlink reflector...
  3. Dec 30 05:36:15 localhost Keepalived_vrrp[13636]: VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(10,11)]
  4. Dec 30 05:36:15 localhost Keepalived_healthcheckers[13635]: Netlink reflector reports IP 192.168.10.46 added
  5. Dec 30 05:36:15 localhost Keepalived_healthcheckers[13635]: Netlink reflector reports IP fe80::5054:ff:feef:323d added
  6. Dec 30 05:36:15 localhost Keepalived_healthcheckers[13635]: Registering Kernel netlink reflector
  7. Dec 30 05:36:15 localhost Keepalived_healthcheckers[13635]: Registering Kernel netlink command channel
  8. Dec 30 05:36:15 localhost Keepalived_healthcheckers[13635]: Opening file '/etc/keepalived/keepalived.conf'.
  9. Dec 30 05:36:15 localhost Keepalived_healthcheckers[13635]: Configuration is using : 11386 Bytes
  10. Dec 30 05:36:15 localhost Keepalived_healthcheckers[13635]: Using LinkWatch kernel netlink reflector...
  11. Dec 30 05:36:15 localhost Keepalived_vrrp[13636]: VRRP_Script(nginx_check) succeeded
  12. Dec 30 05:36:16 localhost Keepalived_vrrp[13636]: VRRP_Instance(VI_1) Transition to MASTER STATE
  13. Dec 30 05:36:16 localhost Keepalived_vrrp[13636]: VRRP_Instance(VI_1) Received lower prio advert, forcing new election
  14. Dec 30 05:36:17 localhost Keepalived_vrrp[13636]: VRRP_Instance(VI_1) Entering MASTER STATE
  15. Dec 30 05:36:17 localhost Keepalived_vrrp[13636]: VRRP_Instance(VI_1) setting protocol VIPs.
  16. Dec 30 05:36:17 localhost Keepalived_vrrp[13636]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.10.60
  17. Dec 30 05:36:17 localhost Keepalived_healthcheckers[13635]: Netlink reflector reports IP 192.168.10.60 added
  18. Dec 30 05:36:22 localhost Keepalived_vrrp[13636]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.10.60
  19. Dec 30 05:38:34 localhost Keepalived_vrrp[13636]: VRRP_Script(nginx_check) failed
  20. Dec 30 05:38:36 localhost Keepalived_vrrp[13636]: VRRP_Instance(VI_1) Received higher prio advert
  21. Dec 30 05:38:36 localhost Keepalived_vrrp[13636]: VRRP_Instance(VI_1) Entering BACKUP STATE
  22. Dec 30 05:38:36 localhost Keepalived_vrrp[13636]: VRRP_Instance(VI_1) removing protocol VIPs.
  23. Dec 30 05:38:36 localhost Keepalived_healthcheckers[13635]: Netlink reflector reports IP 192.168.10.60 removed
  24. Dec 30 05:38:54 localhost Keepalived_vrrp[13636]: VRRP_Script(nginx_check) succeeded
  25. Dec 30 05:38:56 localhost Keepalived_vrrp[13636]: VRRP_Instance(VI_1) forcing a new MASTER election
  26. Dec 30 05:38:56 localhost Keepalived_vrrp[13636]: VRRP_Instance(VI_1) forcing a new MASTER election
  27. Dec 30 05:38:57 localhost Keepalived_vrrp[13636]: VRRP_Instance(VI_1) Transition to MASTER STATE
  28. Dec 30 05:38:58 localhost Keepalived_vrrp[13636]: VRRP_Instance(VI_1) Entering MASTER STATE
  29. Dec 30 05:38:58 localhost Keepalived_vrrp[13636]: VRRP_Instance(VI_1) setting protocol VIPs.
  30. Dec 30 05:38:58 localhost Keepalived_vrrp[13636]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.10.60
  31. Dec 30 05:38:58 localhost Keepalived_healthcheckers[13635]: Netlink reflector reports IP 192.168.10.60 added
  32. Dec 30 05:39:03 localhost Keepalived_vrrp[13636]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.10.60


  
参考：
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