Nginx+keepalived双机热备

时间：2022-12-19 09:42:52
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  1. Nginx Master: 192.168.128.134  
  2. Nginx Backup: 192.168.128.138  
  3. VIP:192.168.128.177  

Nginx安装见nginx安装配置文档

Master与Backup的Nginx配置一致.

在MASTER跟BACKUP上安装Keepalived:

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  1. #tar zxvf keepalived-1.1.15.tar.gz -C ../software  
  2. #cd ../software/keepalived-1.1.15  
  3. #./configure –prefix=/usr/local/keepalived && make && make install  
  4. #cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/  
  5. #cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/  
  6. #mkdir /etc/keepalived  
  7. #cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/  
  8. #cp /usr/local/keepalived/sbin/keepalived /usr/sbin/  
  9. #service keepalived start|stop #做成系统启动服务方便管理.  

修改MASTER 的keepalived.conf

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  1. #vim /etc/keepalived/keepalived.conf  
  2. vrrp_script chk_http_port {         
  3.         script "/usr/local/scripts/nginx_pid.sh" ###监控脚本  
  4.         interval 2 ###监控时间  
  5.         weight 2  
  6.         }  
  7. vrrp_instance VI_1 {  
  8.         state MASTER ### 设置为主  
  9.         interface eth0 ### 监控网卡  
  10.         virtual_router_id 51 ### 这个两台服务器必须一样  
  11.         priority 101 ### 权重值MASTRE一定要高于BAUCKUP  
  12.         authentication {  
  13.         auth_type PASS ### 加密  
  14.         auth_pass test ### 加密的密码，两台服务器一定要一样，不然会出错  
  15.         }  
  16.         track_script {  
  17.         chk_http_port ### 执行监控的服务  
  18.         }  
  19.         virtual_ipaddress {                  
  20.         192.168.128.177 ### VIP 地址          
  21.         }  
  22. }  


修改BACKUP keepalived.conf

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  1. #vim /etc/keepalived/keepalived.conf  
  2. vrrp_script chk_http_port {  
  3.         script "/opt/nginx_pid.sh"  
  4.         interval 2  
  5.         weight 2  
  6. }  
  7. vrrp_instance VI_1 {  
  8.         state BACKUP ### 设置为备份机  
  9.         interface eth0  
  10.         virtual_router_id 51 ### 与 MASTRE 设置值一样  
  11.         priority 80 ### 比 MASTRE权重值低  
  12.   
  13.         authentication {  
  14.         auth_type PASS  
  15.         auth_pass test ### 密码 与 MASTRE 一样  
  16.         }  
  17.         track_script {  
  18.         chk_http_port  
  19.         }  
  20.         virtual_ipaddress {  
  21.         192.168.128.177  
  22.         }  
  23. }  

编写监控nginx监控脚本

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  1. #vim /usr/local/scripts/nginx_pid.sh  
  2. #!/bin/bash  
  3. A=`ps -C nginx --no-header |wc -l` ## 查看是否有 nginx进程 把值赋给变量A  
  4. if [ $A -eq 0 ];then <span style="white-space:pre"> </span>## 如果没有进程值得为 零  
  5. <span style="white-space:pre">  </span>/usr/local/nginx/sbin/nginx  
  6. <span style="white-space:pre">  </span>sleep 3  
  7. <span style="white-space:pre">  </span>if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then  
  8. <span style="white-space:pre">  </span>killall keepalived ## 则结束 keepalived 进程  
  9. <span style="white-space:pre">  </span>fi  
  10. fi  


测试,分别在两个服务器 启动 nginx 和 keepalived

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  1. #/usr/local/nginx/sbin/nginx  
  2. #/etc/init.d/keepalived start  

监控 Nginx Mastaer 的日志

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  1. May 12 17:33:44 localhost Keepalived_vrrp: Configuration is using : 35676 Bytes  
  2. May 12 17:33:44 localhost Keepalived: Starting VRRP child process, pid=1245  
  3. May 12 17:33:44 localhost Keepalived_vrrp: VRRP sockpool: [ifindex(2), proto(112), fd(8,9)]  
  4. May 12 17:33:45 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE  
  5. May 12 17:33:46 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE  
  6. May 12 17:33:46 localhost Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.  
  7. May 12 17:33:46 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.128.177  
  8. May 12 17:33:46 localhost avahi-daemon[2344]: Registering new address record for 192.168.128.177 on eth0.  
  9. May 12 17:33:46 localhost Keepalived_vrrp: Netlink reflector reports IP 192.168.128.177 added  

监控 Nginx Backup 的日志

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  1. May 11 22:28:21 localhost Keepalived: Starting Keepalived v1.1.15 (05/11,2010)  
  2. May 11 22:28:21 localhost Keepalived_vrrp: Using MII-BMSR NIC polling thread...  
  3. May 11 22:28:21 localhost Keepalived_vrrp: Registering Kernel netlink reflector  
  4. May 11 22:28:21 localhost Keepalived_vrrp: Registering Kernel netlink command channel  
  5. May 11 22:28:21 localhost Keepalived_vrrp: Registering gratutious ARP shared channel  
  6. May 11 22:28:21 localhost Keepalived: Starting VRRP child process, pid=27040  
  7. May 11 22:28:21 localhost Keepalived_vrrp: Opening file '/etc/keepalived/keepalived.conf'.  
  8. May 11 22:28:21 localhost Keepalived_vrrp: Configuration is using : 35538 Bytes  
  9. May 11 22:28:21 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Entering BACKUP STATE  
  10. May 11 22:28:21 localhost Keepalived_vrrp: VRRP sockpool: [ifindex(2), proto(112), fd(7,8)]  
  11. May 11 22:28:23 localhost Keepalived_vrrp: VRRP_Script(chk_http_port) succeeded  

看日志可以看出，两台服务器的 MASTRE 和 BACUKUP 已经都正常了

现在我们把Master的Nginx停掉.查看Backup的日志

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  1. May 11 22:28:21 localhost Keepalived: Starting VRRP child process, pid=27040  
  2. May 11 22:28:21 localhost Keepalived_vrrp: Opening file '/etc/keepalived/keepalived.conf'.  
  3. May 11 22:28:21 localhost Keepalived_vrrp: Configuration is using : 35538 Bytes  
  4. May 11 22:28:21 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Entering BACKUP STATE  
  5. May 11 22:28:21 localhost Keepalived_vrrp: VRRP sockpool: [ifindex(2), proto(112), fd(7,8)]  
  6. May 11 22:28:23 localhost Keepalived_vrrp: VRRP_Script(chk_http_port) succeeded  
  7. May 11 22:29:25 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE  
  8. May 11 22:29:26 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE  
  9. May 11 22:29:26 localhost Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.  
  10. May 11 22:29:26 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.128.177  

可以看出backup已经变成master

现在再启动原来master的nginx,再查看backup的日志

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  1. May 11 22:30:32 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Received higher prio advert  
  2. May 11 22:30:32 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Entering BACKUP STATE  
  3. May 11 22:30:32 localhost Keepalived_vrrp: VRRP_Instance(VI_1) removing protocol VIPs.  
  4. May 11 22:30:32 localhost avahi-daemon[2409]: Withdrawing address record for 192.168.128.177 on eth0.  

可以看出又变回了backup.

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