Nginx+keepalived双机热备（主主模式）

由之前的配置信息可知：

master机器（master-node）：103.110.98.14/192.168.1.14      VIP1:103.110.98.20

slave机器（slave-node）：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，

之前设置了VIP（103.110.98.20）

所以还需要设置另一个VIP（103.110.98.21）

修改keepalived的配置

1）master负载机上的keepalived配置：（注意，这里是双主配置，MASTER-BACKUP和BACKUP-MASTER;如果是多主，比如三主，就是MATER-BACKUP-BACKUP、BACKUP-MASTER-BACKUP和BACKUP-BACKUP-MASTER）

注意：

配置中的虚拟路由标识virtual_router_id在MASTER和BACKUP处配置不能一样（但在主从模式下配置是一样的）

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<code>[root@master-node ~]</code><code># vim /etc/keepalived/keepalived.conf</code>

<code>! Configuration File </code><code>for</code> <code>keepalived    </code>

<code>  </code> 

<code>global_defs {</code>

<code>notification_email {    </code>

<code>[email protected]  </code>

<code>[email protected]</code>

<code>}</code>

<code>notification_email_from [email protected] </code>

<code>smtp_server 127.0.0.1     </code>

<code>smtp_connect_timeout 30   </code>

<code>router_id master-node    </code>

<code>vrrp_script chk_http_port {     </code>

<code>    </code><code>script </code><code>"/opt/chk_nginx.sh"</code>  

<code>    </code><code>interval 2                  </code>

<code>    </code><code>weight -5                   </code>

<code>    </code><code>fall 2                   </code>

<code>    </code><code>rise 1                   </code>

<code>vrrp_instance VI_1 {</code>

<code>    </code><code>state MASTER   </code>

<code>    </code><code>interface em1         </code>

<code>    </code><code>mcast_src_ip 103.110.98.14</code>

<code>    </code><code>virtual_router_id 51       </code>

<code>    </code><code>priority 101                </code>

<code>    </code><code>advert_int 1                </code>

<code>    </code><code>authentication {            </code>

<code>        </code><code>auth_type PASS         </code>

<code>        </code><code>auth_pass 1111          </code>

<code>    </code><code>}</code>

<code>track_script {                    </code>

<code>   </code><code>chk_http_port                   </code>

<code>virtual_ipaddress {        </code>

<code>    </code><code>103.110.98.20</code>

<code>notify_master </code><code>"/etc/keepalived/clean_arp.sh 103.110.98.20"</code>

<code>vrrp_instance VI_2 {           </code>

<code>    </code><code>state BACKUP          </code>

<code>    </code><code>interface em1           </code>

<code>    </code><code>mcast_src_ip 103.110.98.24 </code>

<code>    </code><code>virtual_router_id 52      </code>

<code>    </code><code>priority 99              </code>

<code>    </code><code>advert_int 1              </code>

<code>    </code><code>authentication {           </code>

<code>        </code><code>auth_type PASS        </code>

<code>        </code><code>auth_pass 1111         </code>

<code> </code> 

<code>   </code><code>chk_http_port                </code>

<code>virtual_ipaddress {       </code>

<code>    </code><code>103.110.98.21</code>

<code>notify_master </code><code>"/etc/keepalived/clean_arp.sh 103.10.86.21"</code>

[root@master-node ~]# vim /etc/keepalived/clean_arp.sh         //更新vip的arp记录到网关（注意脚本中的网卡别填错了，要跟vip所在网卡一致）

#!/bin/sh

VIP=$1

GATEWAY=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 &amp;&gt;/dev/null

[root@master-node ~]# chmod 755 /etc/keepalived/clean_arp.sh

2）slave负载机上的keepalived配置：

<code>[root@slave-node ~]</code><code># vim /etc/keepalived/keepalived.conf</code>

<code>router_id slave-node    </code>

<code>    </code><code>state BACKUP   </code>

<code>    </code><code>priority 99                </code>

<code>    </code><code>state MASTER          </code>

<code>    </code><code>mcast_src_ip 103.110.98.24</code>

<code>    </code><code>priority 101              </code>

<code>notify_master </code><code>"/etc/keepalived/clean_arp.sh 21"</code>

[root@slave-node ~]# vim /etc/keepalived/clean_arp.sh 

GATEWAY=103.110.98.1 

[root@slave-node ~]# chmod 755 /etc/keepalived/clean_arp.sh

重启master和slave负载机的keepalive（保证两台机器的ngixn和keepalived服务都启动）

[root@master-node ~]# /etc/init.d/keepalived restart

[root@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：

103.110.98.20 dev.wangshibo.com

103.110.98.21 dev.wangshibo.com

浏览器访问是正常的（如果master或slave有一台宕机，或其中一个VIP故障，只要另一台是正常的就行）

关闭两台负载机其中一台的keepalived服务，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，会自动重启（前提是keepalived服务要启动）！对网站域名的访问丝毫不受影响。

[root@master-node ~]# pkill -9 nginx

root 32365 9775 0 19:04 pts/0 00:00:00 grep --color=auto nginx

[root@master-node ~]# ps -ef|grep nginx

root 32367 9775 0 19:04 pts/0 00:00:00 grep --color=auto 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=auto nginx

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本文转自散尽浮华博客园博客，原文链接：http://www.cnblogs.com/kevingrace/p/6146031.html，如需转载请自行联系原作者