Nginx+Keepalived示例补充

最新推荐文章于 2025-03-20 09:28:09 发布

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#nginx #运维 #keepalived

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博客介绍了Keepalived实现Nginx高可用的配置方法。给出两个配置文件示例，一是用“killall -0 nginx”命令，根据退出码判断Nginx服务状态；二是通过脚本，依据脚本退出码实现。还提到BACKUP节点只需修改角色、优先级和router_id。

Keepalived实现Nginx高可用配置文件示例一：

[root@node1 ~]# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived
 
global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL_MASTER
}
 
vrrp_script check_nginx {
    script "killall -0 nginx"
    interval 2
}
 
vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
 
    track_script {
      check_nginx
    }
 
    virtual_ipaddress {
        192.168.188.100
    }
}

该示例是通过" killall -0 nginx "命令实现对Nginx服务的高可用，如果Nginx服务启动，则该命令的退出码应为0，反之，退出码为1。而" killall "命令是" psmisc "包提供的。

Keepalived实现Nginx高可用配置文件示例二：

[root@node1 ~]# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived
 
global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL_MASTER
}
 
vrrp_script check_nginx {
    script "/etc/keepalived/check_nginx1.sh"  ##脚本的绝对路径
    interval 2
}
 
vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
 
    track_script {
      check_nginx
    }
 
    virtual_ipaddress {
        192.168.188.100
    }
}

该示例是通过脚本的方式对Nginx实现高可用，通过判断脚本的退出码来实现。

脚本代码1：
[root@node1 ~]# vim /etc/keepalived/check_nginx1.sh

#!/bin/bash
 
nginx_stats=`ps -C nginx --no-header | wc -l`
if [ $nginx_stats -eq 0 ]
then
  nginxStats=1
else
  nginxStats=0
fi
 
exit $nginxStats

脚本代码2：
[root@node1 ~]# vim /etc/keepalived/check_nginx2.sh

#!/bin/bash
 
while true
do
  nginx_state=`ps -C nginx --no-header | wc -l`
  if [ $httpd_state -eq 0 ]
  then
    systemctl start nginx
    sleep 2
    nginx_state=`ps -C nginx --no-header | wc -l`
    if [ $httpd_state -eq 0 ]
    then
      systemctl stop keepalived
    fi
  fi
done

以上都是Master节点的配置，而BACKUP节点只需要对角色，优先级，router_id进行修改即可。