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我无法（重新）启动 apache，因为端口 80 已在使用中：

[root@out-dev log]# service httpd start
Starting httpd: httpd: Could not reliably determine the server's fully qualified domain name, using <ip> for ServerName
(98)Address already in use: make_sock: could not bind to address [::]:80
(98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
Unable to open logs
                                                           [FAILED]

所以我尝试识别使用端口 80 的进程：

[root@out-dev log]# netstat -npl | grep ':80'
tcp 0 0 :::80 :::* LISTEN 3840/httpd

这是httpd！这对我来说很奇怪，因为服务 httpd 显然没有运行：

[root@out-dev log]# service httpd status
httpd is stopped

无论如何，我尝试杀死该进程，但只要我这样做，就会出现一个新进程，控制端口 80。并且一直service httpd status表明 httpd 没有运行。

[root@out-dev log]# kill -9 3840
[root@out-dev log]# netstat -npl | grep ':80'
tcp 0 0 :::80 :::* LISTEN 3842/httpd
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