我尝试了一下sudo systemctl restart apache2，得到了以下输出：apache2.service 的作业失败，因为控制进程以错误代码退出。有关详细信息，请参阅“systemctl status apache2.service”和“journalctl -xe”。
当我尝试“systemctl status apache2.service”时：
● apache2.service - Apache HTTP 服务器 已加载：已加载（/lib/systemd/system/apache2.service；已启用；供应商预设：已启用） 插入：/lib/systemd/system/apache2.service.d └─apache2-systemd.conf 活动：失败（结果：退出代码）自 2019-02-11 星期一 03:02:35 UTC；2 分 3 秒前 进程：12193 ExecStart=/usr/sbin/apachectl start（代码=exited，状态=1/FAILURE）
当我尝试：“journalctl -xe”时：
Hint: You are currently not seeing messages from other users and the system. Users in groups 'adm', 'systemd-journal' can see all messages. Pass -q to turn off this notice. -- Support: http://www.ubuntu.com/support -- -- Unit UNIT has finished starting up. -- -- The start-up result is RESULT. Feb 11 02:39:01 ths systemd[4215]: Reached target Default. -- Subject: Unit UNIT has finished start-up -- Defined-By: systemd -- Support: http://www.ubuntu.com/support -- -- Unit UNIT has finished starting up. -- -- The start-up result is RESULT. Feb 11 02:39:01 ths systemd[4215]: Startup finished in 70ms. -- Subject: User manager start-up is now complete -- Defined-By: systemd -- Support: http://www.ubuntu.com/support -- -- The user manager instance for user 1001 has been started. All services queued -- for starting have been started. Note that other services might still be starting -- up or be started at any later time. -- -- Startup of the manager took 70596 microseconds. lines 1794-1816/1816 (END)
我尝试了谷歌搜索的多种解决方案，也尝试重新安装 Apache，但仍然出现此错误。有什么建议吗？
编辑： sudo systemctl status apache2 给出：
> ● 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 Mon 2019-02-11 03:37:30 UTC; 1min 36s ago Process:
> 21753 ExecStart=/usr/sbin/apachectl start (code=exited,
> status=1/FAILURE)
>
> Feb 11 03:37:30 ths systemd[1]: Starting The Apache HTTP Server... Feb
> 11 03:37:30 ths apachectl[21753]: (98)Address already in use: AH00072:
> make_sock: could not bind to address [::]:80 Feb 11 03:37:30 ths
> apachectl[21753]: (98)Address already in use: AH00072: make_sock:
> could not bind to address 0.0.0.0:80 Feb 11 03:37:30 ths
> apachectl[21753]: no listening sockets available, shutting down Feb 11
> 03:37:30 ths apachectl[21753]: AH00015: Unable to open logs Feb 11
> 03:37:30 ths apachectl[21753]: Action 'start' failed. Feb 11 03:37:30
> ths apachectl[21753]: The Apache error log may have more information.
> Feb 11 03:37:30 ths systemd[1]: apache2.service: Control process
> exited, code=exited status=1 Feb 11 03:37:30 ths systemd[1]:
> apache2.service: Failed with result 'exit-code'. Feb 11 03:37:30 ths
> systemd[1]: Failed to start The Apache HTTP Server.
编辑 2：$ apachectl configtest
Syntax OK
答案1
在输出中sudo systemctl status apache2我们可以看到以下消息：
... 无法绑定到地址 [::]:80 ...
...无法绑定到地址 0.0.0.0:80...
我猜想端口 80 被另一个服务使用。使用下列命令之一来查找该服务：
sudo lsof -i -n -P | grep ':80'
sudo netstat -peanut | grep ':80'
然后停止（或禁用）该服务并重新启动（启用）Apache。如果 Apache 成功启用，那么您可以决定永久禁用其他服务或更改两个冲突服务之一（Apache 或另一个）上的端口 80。
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