systemctl启动nginx失败

Question

免责声明:我有0服务器管理经验，所以请原谅我的术语和显然缺乏努力来描述这些问题。我只是不知道自己在做什么。

无论如何，我跟随这篇文章自动生成SSL证书--这是我们的任意域所需要的东西，这使我找到了这些文档来安装nginx扩展来实现这一点。我开始阅读requirements部分，并开始安装第一个部分：OpenResty，我认为它扩展了nginx模块。我遵循安装过程，运行了关闭nginx的初始命令，以便安装通过：

sudo systemctl disable nginx
sudo systemctl stop nginx

安装工作进行得很顺利，但是当我试图重新启动nginx时

sudo systemctl enable nginx
sudo systemctl start nginx

在最后一个命令中我得到了一个错误：

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

这是sudo systemctl status nginx.service告诉您的：

● 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 Fri 2020-06-19 11:50:25 UTC; 5min ago
  Process: 2160 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=1/FAILURE)
  Process: 2157 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=0/SUCCESS)

Jun 19 11:50:22 staging nginx[2160]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Jun 19 11:50:23 staging nginx[2160]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Jun 19 11:50:23 staging nginx[2160]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Jun 19 11:50:24 staging nginx[2160]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Jun 19 11:50:24 staging nginx[2160]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Jun 19 11:50:25 staging nginx[2160]: nginx: [emerg] still could not bind()
Jun 19 11:50:25 staging systemd[1]: nginx.service: Control process exited, code=exited status=1
Jun 19 11:50:25 staging systemd[1]: Failed to start A high performance web server and a reverse proxy server.
Jun 19 11:50:25 staging systemd[1]: nginx.service: Unit entered failed state.
Jun 19 11:50:25 staging systemd[1]: nginx.service: Failed with result 'exit-code'.

我不知道这意味着什么，也不知道如何解决。老实说，我甚至不知道systemctl做什么。我相信这是某种服务接口，但我真的不知道。它是在设置暂存服务器时刚刚安装的。

Answer 1

nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

意味着仍有一个正在运行的守护进程监听端口80。您可以使用

lsof -i :80

找出它是什么。停止此操作，您将能够启动nginx服务。