nginx 启动报错：Job for nginx.service failed because the con

nginx启动时提示错误信息：

>>>?service?nginx?restart
Job?for?nginx.service?failed?because?the?control?process?exited?with?error?code.
See?"systemctl?status?nginx.service"?and?"journalctl?-xe"?for?details.

根据提示输入命令：

systemctl status nginx.service

>>>?systemctl?status?nginx.service

●?nginx.service?-?A?high?performance?web?server?and?a?reverse?proxy?server
???Loaded:?loaded?(/lib/systemd/system/nginx.service;?enabled;?vendor?preset:?enabled)
???Active:?failed?(Result:?exit-code)?since?五?2018-08-31?11:08:14?CST;?5min?ago
??Process:?4668?ExecStop=/sbin/start-stop-daemon?--quiet?--stop?--retry?QUIT/5?--pidfile?/run/nginx.pid?(code=exited,?status=1/FAILURE)
??Process:?28149?ExecStart=/usr/sbin/nginx?-g?daemon?on;?master_process?on;?(code=exited,?status=1/FAILURE)
??Process:?28146?ExecStartPre=/usr/sbin/nginx?-t?-q?-g?daemon?on;?master_process?on;?(code=exited,?status=0/SUCCESS)
?Main?PID:?4455?(code=killed,?signal=KILL)

8月?31?11:08:13?user-70DGA014CN?nginx[28149]:?nginx:?[emerg]?bind()?to?0.0.0.0:80?failed?(98:?Address?already?in?use)
8月?31?11:08:13?user-70DGA014CN?nginx[28149]:?nginx:?[emerg]?bind()?to?[::]:80?failed?(98:?Address?already?in?use)
8月?31?11:08:13?user-70DGA014CN?nginx[28149]:?nginx:?[emerg]?bind()?to?0.0.0.0:80?failed?(98:?Address?already?in?use)
8月?31?11:08:13?user-70DGA014CN?nginx[28149]:?nginx:?[emerg]?bind()?to?[::]:80?failed?(98:?Address?already?in?use)
8月?31?11:08:14?user-70DGA014CN?nginx[28149]:?nginx:?[emerg]?still?could?not?bind()
8月?31?11:08:14?user-70DGA014CN?systemd[1]:?nginx.service:?Control?process?exited,?code=exited?status=1
8月?31?11:08:14?user-70DGA014CN?systemd[1]:?Failed?to?start?A?high?performance?web?server?and?a?reverse?proxy?server.
8月?31?11:08:14?user-70DGA014CN?systemd[1]:?nginx.service:?Unit?entered?failed?state.
8月?31?11:08:14?user-70DGA014CN?systemd[1]:?nginx.service:?Failed?with?result?'exit-code'.
8月?31?11:08:49?user-70DGA014CN?systemd[1]:?Stopped?A?high?performance?web?server?and?a?reverse?proxy?server.

journalctl -xe

>>>?journalctl?-xe
8月?31?11:08:12?user-70DGA014CN?nginx[28149]:?nginx:?[emerg]?bind()?to?0.0.0.0:80?failed?(98:?Address?already?in?use)
8月?31?11:08:12?user-70DGA014CN?nginx[28149]:?nginx:?[emerg]?bind()?to?[::]:80?failed?(98:?Address?already?in?use)
8月?31?11:08:12?user-70DGA014CN?nginx[28149]:?nginx:?[emerg]?bind()?to?0.0.0.0:80?failed?(98:?Address?already?in?use)
8月?31?11:08:12?user-70DGA014CN?nginx[28149]:?nginx:?[emerg]?bind()?to?[::]:80?failed?(98:?Address?already?in?use)
8月?31?11:08:13?user-70DGA014CN?nginx[28149]:?nginx:?[emerg]?bind()?to?0.0.0.0:80?failed?(98:?Address?already?in?use)
8月?31?11:08:13?user-70DGA014CN?nginx[28149]:?nginx:?[emerg]?bind()?to?[::]:80?failed?(98:?Address?already?in?use)
8月?31?11:08:13?user-70DGA014CN?nginx[28149]:?nginx:?[emerg]?bind()?to?0.0.0.0:80?failed?(98:?Address?already?in?use)
8月?31?11:08:13?user-70DGA014CN?nginx[28149]:?nginx:?[emerg]?bind()?to?[::]:80?failed?(98:?Address?already?in?use)
8月?31?11:08:14?user-70DGA014CN?nginx[28149]:?nginx:?[emerg]?still?could?not?bind()
8月?31?11:08:14?user-70DGA014CN?systemd[1]:?nginx.service:?Control?process?exited,?code=exited?status=1
8月?31?11:08:14?user-70DGA014CN?systemd[1]:?Failed?to?start?A?high?performance?web?server?and?a?reverse?proxy?server.
--?Subject:?nginx.service?单元已失败
--?Defined-By:?systemd
--?Support:?http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--?
--?nginx.service?单元已失败。
--?
--?结果为“failed”。
8月?31?11:08:14?user-70DGA014CN?systemd[1]:?nginx.service:?Unit?entered?failed?state.
8月?31?11:08:14?user-70DGA014CN?systemd[1]:?nginx.service:?Failed?with?result?'exit-code'.
8月?31?11:08:49?user-70DGA014CN?systemd[1]:?Stopped?A?high?performance?web?server?and?a?reverse?proxy?server.
--?Subject:?nginx.service?单元已结束停止操作
--?Defined-By:?systemd
--?Support:?http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--?
--?nginx.service?单元已结束停止操作。

从上述信息中可以看出nginx的80端口被使用（但这不是最主要的问题）

第一个解决方法：

注意：

????如果曾经修改/etc/nginx/conf.d/default.conf或者是/etc/nginx/nginx.conf文件，并且使用命令：systemctl restart nginx.service,那么就会出现错误信息如下：

>>>?service?nginx?restart
Job?for?nginx.service?failed?because?the?control?process?exited?with?error?code.
See?"systemctl?status?nginx.service"?and?"journalctl?-xe"?for?details.

这时你需要打开default.conf或nginx.conf文件，查看是否少写了一个分号。

第二个解决方法：

1. ?卸载nginx，并且删除nginx相关文件。

2. ?重装nginx

（编辑：李大同）

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