Virtual hosting

[Дилян Палаузов]

Hello,

on my server I have several IP-Addresses and for some of them I want to 
use Nginx to server port 80.  I want to host several different domains. 
  Let's say A.org and B.org to IP-Address 1.1.1.1:80 and C.org to 
IP-Address 1.1.1.2:80, while 1.1.1.3:80 shall not be used by Nginx.

Shall I configure Nginx something like
   server {
    listen 1.1.1.1;
    server_name A.org B.org;
    if ($host ~ "A.org") {root /A; ... break;}
    if ($host ~ "B.org") {root /B;... break;}
   }
   server {
    listen 1.1.1.2;
    server_name C.org;
   }
or is there a way to configure three different server{}s?
   server { server_name A.org; }
   server { server_name B.org; }
   server { server_name C.org; listen 1.1.1.2; }

In the former form, I cannot use directly "root /A;" in if ().

In the latter form, I cannot use for A.org and B.org listen 1.1.1.1, as 
Nginx says it cannot bind twice IP1.1.1.1 (it can bind to it for A, but 
since the socket is already occupied, it cannot bind for for B.org}.

Moreover, as the Nginx module documentation is available both trough 
wiki.nginx.org (wiki.nginx.org/HttpCoreModule) and 
http://www.nginx.org/en/docs/, I would like to ask which is the 
reference documentation (and what is the point to have the documentation 
on two different places -- e.g. why isn't the wiki enough).

nginx version: nginx/1.0.15
TLS SNI support enabled
configure arguments: --pid-path=/var/run/nginx.pid 
--conf-path=/etc/nginx/core.conf 
--error-log-path=/var/log/nginx/nginx.log --user=wwwrun --group=nogroup 
--with-ipv6 --without-poll_module --without-select_module 
--with-file-aio --with-http_ssl_module --with-http_addition_module 
--with-http_xslt_module --with-http_image_filter_module 
--with-http_sub_module --with-http_dav_module --with-http_flv_module 
--with-http_mp4_module --with-http_gzip_static_module 
--with-http_random_index_module --with-http_degradation_module 
--with-http_stub_status_module --http-log-path=/var/log/nginx 
--with-pcre --prefix=/usr --with-cc-opt='-O3 -march=native 
-Wl,--hash-style=gnu -Wl,-O1 -flto -Wl,-z,relro' 
--with-ld-opt='-L/usr/lib64 -L/lib64' --without-http_ssi_module 
--without-http_uwsgi_module --without-http_scgi_module 
--without-http_upstream_ip_hash_module 
--without-http_split_clients_module --without-http_empty_gif_module

Thanks in advance for your help
   Дилян