嗨，我是nginx的新手，我试着在我的服务器上设置它（运行Ubuntu 4），它已经有apache运行。
所以在我apt-get install它之后，我试着启动nginx。然后我得到了这样的消息：

Starting nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
configuration file /etc/nginx/nginx.conf test is successful
[emerg]: bind() to 0.0.0.0:80 failed (98: Address already in use)
[emerg]: bind() to 0.0.0.0:80 failed (98: Address already in use)
[emerg]: bind() to 0.0.0.0:80 failed (98: Address already in use)
[emerg]: bind() to 0.0.0.0:80 failed (98: Address already in use)
[emerg]: bind() to 0.0.0.0:80 failed (98: Address already in use)

这是有道理的，因为Apache使用的是端口80。
然后我试着修改nginx.conf，我参考了一些文章，所以我这样修改它：

server {

        listen       8080;

        location / {
         proxy_pass  http://xx.xx.xx.xx:9500;
         proxy_set_header   Host             $host:8080;
         proxy_set_header   X-Real-IP        $remote_addr;
         proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
         proxy_set_header Via    "nginx";
        }

在保存这个并尝试再次启动nginx后，我仍然得到和以前一样的错误。我真的找不到关于这个的相关帖子，有没有好人能粉碎一些光明？

我应该在这里发布conf中的所有内容：

user www-data;
worker_processes  1;

error_log  /var/log/nginx/error.log;
pid        /var/run/nginx.pid;

events {
    worker_connections  1024;
    # multi_accept on;
}

http {
    include       /etc/nginx/mime.types;

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

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;
    tcp_nodelay        on;

    gzip  on;
    gzip_disable "MSIE [1-6]\.(?!.*SV1)";

    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;

   server {

        listen       81;

        location / {
         proxy_pass  http://94.143.9.34:9500;
         proxy_set_header   Host             $host:81;
         proxy_set_header   X-Real-IP        $remote_addr;
         proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
         proxy_set_header Via    "nginx";
        }

    }
}

 mail {
      See sample authentication script at:
      http://wiki.nginx.org/NginxImapAuthenticateWithApachePhpScript
 
      auth_http localhost/auth.php;
      pop3_capabilities "TOP" "USER";
      imap_capabilities "IMAP4rev1" "UIDPLUS";
 
     server {
         listen     localhost:110;
         protocol   pop3;
         proxy      on;
     }
 
     server {
         listen     localhost:143;
         protocol   imap;
         proxy      on;
     }
 }

基本上，除了添加服务器部分外，我没有做任何更改。