首先修改apache监听端口80为8080 在/etc/apache2/ports.conf中包含Apache

Listen 1.2.3.4:80 to 1.2.3.4:8080
sudo service apache2 restart 

or

sudo service httpd restart    // in case of centos

然后添加nginx作为反向代理服务器，将监听apache端口

server {
 listen   1.2.3.4:80;
 server_name  some.com;

 access_log  /var/log/nginx/something-access.log;

 location / {
  proxy_pass http://localhost:8080;
  proxy_redirect off;
  proxy_set_header Host $host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 }


location ~* ^.+\.(jpg|js|jpeg|png)$ {
   root /usr/share/nginx/html/;
}

location /404.html {
  root /usr/share/nginx/html/40x.html;
}

error_page 404 /404.html;
    location = /40x.html {
}

error_page 500 502 503 504 /50x.html;
    location = /50x.html {
}

# put code for static content like js/css/images/fonts
}

修改后重启nginx服务器

sudo service nginx restart

现在所有流量都将由nginx服务器处理，并将所有动态请求发送到apache，静态内容由nginx服务器提供。

对于像缓存这样的高级配置:

https://www.linode.com/docs/web-servers/nginx/slightly-more-advanced-configurations-for-nginx/#basic-nginx-caching

我也得到了同样的错误。

nginx: [emerg] bind() to [::]:80 failed(98:地址已被使用)

当我在浏览器中输入localhost时，我得到

它的工作原理!

这是此服务器的默认web页面。

web服务器软件正在运行，但还没有添加内容。 而不是nginx的欢迎页面，apache2运行在相同的端口上，

找到apache2 ports.conf文件 sudo /etc/apache2/ports.conf 将端口更改为80以外的端口，我将其更改为70 保存文件 重新启动系统

它也适用于你，如果你在浏览器中输入localhost，你会得到nginx欢迎页面

[::]:80是ipv6地址。

如果你有一个nginx配置，监听端口80和端口[::]:80，就会导致这个错误。

我有以下在我的默认网站可用文件:

listen 80;
listen [::]:80 default_server;

你可以通过添加ipv6only=on到[::]:80来解决这个问题，就像这样:

listen 80;
listen [::]:80 ipv6only=on default_server;

有关更多信息，请参见:

http://forum.linode.com/viewtopic.php?t=8580

http://wiki.nginx.org/HttpCoreModule#listen

我也遇到过类似的问题。日志如下所示

2018/10/31 12:54:20 [emerg] 128005#128005: bind() to 0.0.0.0:80 failed (98: Address already in use)
2018/10/31 12:54:20 [emerg] 128005#128005: bind() to 0.0.0.0:443 failed (98: Address already in use)
2018/10/31 12:54:20 [emerg] 128005#128005: bind() to [::]:80 failed (98: Address already in use)
2018/10/31 12:54:20 [emerg] 128005#128005: bind() to 0.0.0.0:80 failed (98: Address already in use)
2018/10/31 12:54:20 [emerg] 128005#128005: bind() to 0.0.0.0:443 failed (98: Address already in use)
2018/10/31 12:54:20 [emerg] 128005#128005: bind() to [::]:80 failed (98: Address already in use)
2018/10/31 12:54:20 [emerg] 128005#128005: bind() to 0.0.0.0:80 failed (98: Address already in use)
2018/10/31 12:54:20 [emerg] 128005#128005: bind() to 0.0.0.0:443 failed (98: Address already in use)
2018/10/31 12:54:20 [emerg] 128005#128005: bind() to [::]:80 failed (98: Address already in use)
2018/10/31 12:54:20 [emerg] 128005#128005: bind() to 0.0.0.0:80 failed (98: Address already in use)
2018/10/31 12:54:20 [emerg] 128005#128005: bind() to 0.0.0.0:443 failed (98: Address already in use)
2018/10/31 12:54:20 [emerg] 128005#128005: bind() to [::]:80 failed (98: Address already in use)
2018/10/31 12:54:20 [emerg] 128005#128005: bind() to 0.0.0.0:80 failed (98: Address already in use)
2018/10/31 12:54:20 [emerg] 128005#128005: bind() to 0.0.0.0:443 failed (98: Address already in use)
2018/10/31 12:54:20 [emerg] 128005#128005: bind() to [::]:80 failed (98: Address already in use)
2018/10/31 12:54:20 [emerg] 128005#128005: still could not bind()
2018/10/31 12:54:23 [alert] 127997#127997: unlink() "/run/nginx.pid" failed (2: No such file or directory)
2018/10/31 22:40:48 [info] 36948#36948: Using 32768KiB of shared memory for push module in /etc/nginx/nginx.conf:68
2018/10/31 22:50:40 [emerg] 37638#37638: duplicate listen options for [::]:80 in /etc/nginx/sites-enabled/default:18
2018/10/31 22:51:33 [info] 37787#37787: Using 32768KiB of shared memory for push module in /etc/nginx/nginx.conf:68

最后一个[emerg]显示了[::]:80的重复监听选项，这意味着有多个nginx块文件包含[::]:80。

我的解决方案是删除[::]:80设置之一

附注:你可能有默认块文件。我的建议是将该文件作为端口80的默认服务器。并从其他块文件中删除[::]:80

另一个可能的问题是，当你在nginx中通过根目录启动ngix时，它会启动两次。例如，Config是对用户'www-data'进行配置的。 因此，您需要切换到另一个用户(而不是根用户)来启动服务。

我的问题是我有重叠的监听指令。我设法通过运行来找出重叠的指令

grep -r listen /etc/nginx/*

两个文件在同一个端口监听:

/etc/nginx/conf.d/default.conf:           listen 80;  
/etc/nginx/sites-enabled/default.conf:    listen 80;