环境

系统: 阿里云Ubuntu18.04 TLS
nginx版本: 1.14.0

问题描述

出于某些原因,nginx来来回回装了好几遍,最后出现的这个报错:
Failed to start A high performance web server and a reverse proxy server

完整报错信息如下:

$ systemctl status nginx           
* 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 Mon 2022-03-14 20:59:24 CST; 3min 22s ago
     Docs: man:nginx(8)
 Main PID: 17851 (code=exited, status=0/SUCCESS)

Mar 14 20:59:23 aliyum nginx[25077]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Mar 14 20:59:23 aliyum nginx[25077]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)
Mar 14 20:59:23 aliyum nginx[25077]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Mar 14 20:59:23 aliyum nginx[25077]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)
Mar 14 20:59:24 aliyum nginx[25077]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Mar 14 20:59:24 aliyum nginx[25077]: nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)
Mar 14 20:59:24 aliyum nginx[25077]: nginx: [emerg] still could not bind()
Mar 14 20:59:24 aliyum systemd[1]: nginx.service: Control process exited, code=exited status=1
Mar 14 20:59:24 aliyum systemd[1]: nginx.service: Failed with result 'exit-code'.
Mar 14 20:59:24 aliyum systemd[1]: Failed to start A high performance web server and a reverse proxy server.

解决

一开始重装的时候没有出现这个报错，重装了几次才出现的。一开始的时候还以为重装时卸载不干净造成的。
最后发现 虽然nginx卸载了,但是依然有正在运行的nginx实例
可以查看下端口占用:

netstat -apn | grep 80

所以答案就出来了:把进程杀掉就可以了,连重装都不用重装