Nginx+keepalived双机热备（主主模式）

之前已经介绍了Nginx&＃43;Keepalived双机热备的主从模式&＃xff0c;今天在此基础上说下主主模式的配置。

由之前的配置信息可知&＃xff1a;
master机器&＃xff08;master-node&＃xff09;&＃xff1a;103.110.98.14/192.168.1.14      VIP1:103.110.98.20
slave机器&＃xff08;slave-node&＃xff09;&＃xff1a;103.110.98.24/192.168.1.24       VIP2:103.110.98.21

主主模式需要两个负载均衡的VIP&＃xff0c;
之前设置了VIP&＃xff08;103.110.98.20&＃xff09;
所以还需要设置另一个VIP&＃xff08;103.110.98.21&＃xff09;

修改keepalived的配置

1&＃xff09;master负载机上的keepalived配置&＃xff1a;&＃xff08;注意&＃xff0c;这里是双主配置&＃xff0c;MASTER-BACKUP和BACKUP-MASTER;如果是多主&＃xff0c;比如三主&＃xff0c;就是MATER-BACKUP-BACKUP、BACKUP-MASTER-BACKUP和BACKUP-BACKUP-MASTER&＃xff09;
注意&＃xff1a;
配置中的虚拟路由标识virtual_router_id在MASTER和BACKUP处配置不能一样&＃xff08;但在主从模式下配置是一样的&＃xff09;

[root&＃64;master-node ~]# vim /etc/keepalived/clean_arp.sh         //更新vip的arp记录到网关&＃xff08;注意脚本中的网卡别填错了&＃xff0c;要跟vip所在网卡一致&＃xff09;
#!/bin/sh
VIP&＃61;$1
GATEWAY&＃61;103.110.98.1                                                         //负载均衡器的公网网关地址
/sbin/arping -I em1 -c 5 -s $VIP $GATEWAY &>/dev/null
[root&＃64;master-node ~]# chmod 755 /etc/keepalived/clean_arp.sh

2&＃xff09;slave负载机上的keepalived配置&＃xff1a;

[root&＃64;slave-node ~]# vim /etc/keepalived/clean_arp.sh
#!/bin/sh
VIP&＃61;$1
GATEWAY&＃61;103.110.98.1
/sbin/arping -I em1 -c 5 -s $VIP $GATEWAY &>/dev/null
[root&＃64;slave-node ~]# chmod 755 /etc/keepalived/clean_arp.sh

重启master和slave负载机的keepalive&＃xff08;保证两台机器的ngixn和keepalived服务都启动&＃xff09;
[root&＃64;master-node ~]# /etc/init.d/keepalived restart
[root&＃64;slave-node ~]# /etc/init.d/keepalived restart

将nginx中配置的域名解析到这两个VIP地址上&＃xff1a;
103.110.98.20 dev.wangshibo.com
103.110.98.21 dev.wangshibo.com

浏览器访问是正常的&＃xff08;如果master或slave有一台宕机&＃xff0c;或其中一个VIP故障&＃xff0c;只要另一台是正常的就行&＃xff09;

关闭两台负载机其中一台的keepalived服务&＃xff0c;那么它的VIP就会自动漂移到另一台机器上。
关闭两台机器的nginx&＃xff0c;会自动重启&＃xff08;前提是keepalived服务要启动&＃xff09;&＃xff01;对网站域名的访问丝毫不受影响。

[root&＃64;master-node ~]# pkill -9 nginx
root 32365 9775 0 19:04 pts/0 00:00:00 grep --color&＃61;auto nginx
[root&＃64;master-node ~]# ps -ef|grep nginx
root 32367 9775 0 19:04 pts/0 00:00:00 grep --color&＃61;auto nginx
[root&＃64;master-node ~]# ps -ef|grep nginx
root 32369 32368 0 19:04 ? 00:00:00 /bin/bash /opt/chk_nginx.sh
root 32374 1 0 19:04 ? 00:00:00 nginx: master process /usr/local/nginx/sbin/nginx
www 32376 32374 1 19:04 ? 00:00:00 nginx: worker process
www 32377 32374 1 19:04 ? 00:00:00 nginx: worker process
www 32378 32374 1 19:04 ? 00:00:00 nginx: worker process
www 32379 32374 1 19:04 ? 00:00:00 nginx: worker process
www 32380 32374 1 19:04 ? 00:00:00 nginx: worker process
www 32381 32374 1 19:04 ? 00:00:00 nginx: worker process
www 32382 32374 1 19:04 ? 00:00:00 nginx: worker process
www 32383 32374 1 19:04 ? 00:00:00 nginx: worker process
www 32384 32374 0 19:04 ? 00:00:00 nginx: cache manager process
www 32385 32374 0 19:04 ? 00:00:00 nginx: cache loader process
root 32387 9775 0 19:04 pts/0 00:00:00 grep --color&＃61;auto nginx