大家好，我在Apache2上有问题（在ubuntu上）。我的服务器无法启动，当我进入时会systemctl status apache2.service看到此消息；
● apache2.service - The Apache HTTP Server
Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor preset: enabled)
Drop-In: /lib/systemd/system/apache2.service.d
└─apache2-systemd.conf
Active: failed (Result: exit-code) since Sat 2019-01-12 13:11:24 +03; 22min ago
Process: 7336 ExecStart=/usr/sbin/apachectl start (code=exited, status=1/FAILURE)
Jan 12 13:11:24 lvlzyro apachectl[7336]: AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
Jan 12 13:11:24 lvlzyro apachectl[7336]: (98)Address already in use: AH00072: make_sock: could not bind to address [::]:80
Jan 12 13:11:24 lvlzyro apachectl[7336]: (98)Address already in use: AH00072: make_sock: could not bind to address 0.0.0.0:80
Jan 12 13:11:24 lvlzyro apachectl[7336]: no listening sockets available, shutting down
Jan 12 13:11:24 lvlzyro apachectl[7336]: AH00015: Unable to open logs
Jan 12 13:11:24 lvlzyro apachectl[7336]: Action 'start' failed.
Jan 12 13:11:24 lvlzyro apachectl[7336]: The Apache error log may have more information.
Jan 12 13:11:24 lvlzyro systemd[1]: apache2.service: Control process exited, code=exited status=1
Jan 12 13:11:24 lvlzyro systemd[1]: apache2.service: Failed with result 'exit-code'.
Jan 12 13:11:24 lvlzyro systemd[1]: Failed to start The Apache HTTP Server.
很可能是Apache或另一个Web服务器（例如nginx）已经在运行。要检查的是，grep命令查找进程列表apache，httpd以及nginx或使用netstat -anp | grep ':80\s'一探究竟。
了解哪个进程使用端口80后，您可以决定是否要终止它，或者是否具有不受支持的配置并且不能在端口80上使用Apache。
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我来说两句