如何通过不同的端口启动 nginx (80以外)

嗨，我是 nginx 上的一个新手，我试图在我的服务器上安装它(运行 Ubuntu 4) ，它已经运行了 apache。

因此，在我 apt-get install之后，我尝试启动 nginx，然后我得到这样的信息:

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80端口。

然后我试图修改 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";
}
 

在保存这个命令并再次尝试启动 nginx 之后，我仍然会得到与前面相同的错误。我实在找不到一篇关于这个的相关文章，有没有什么好人可以分享一些启示呢？

我应该把所有的内容都贴在这里:

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之外，我什么也没有改变。