You need to make sure your DNS points www either to an A record or a CNAME record.

As for the subdomain you can do

server {
listen 80;
server_name subdomain.domain.tld

location / {
expires 8d;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header Host $http_host;
proxy_set_header X-NginX-Proxy true;
proxy_read_timeout 5m;
proxy_connect_timeout 5m;
proxy_pass http://127.0.0.1:1337;
proxy_redirect off;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
}
}


This is just an example, but change the server name and the proxy_pass and it should work fine

my conf file
server {
listen 80;
server_name blog.csbukhari.com;

client_max_body_size 10M;

location / {
proxy_pass http://localhost:2368/;
proxy_set_header Host $host;
proxy_buffering off;
}
}


i do it but i dosent work

I don't see any of csbukhari.com or www.csbukhari.com there, are you sure this is the only config file?

What is this block of code actually doing?

location / {
expires 8d;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header Host $http_host;
proxy_set_header X-NginX-Proxy true;
proxy_read_timeout 5m;
proxy_connect_timeout 5m;
proxy_pass http://127.0.0.1:1337;
proxy_redirect off;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
}

Is this in the default.conf file? Or is this the customized config file in the sites-available directory?

@wjhsie:

proxy_set_header X-Real-IP $remote_addr; 

proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 

proxy_set_header X-Forwarded-Proto $scheme; 

proxy_set_header Host $http_host; 

proxy_set_header X-NginX-Proxy true;

[..]

proxy_set_header Upgrade $http_upgrade; 

proxy_set_header Connection "upgrade"; 

sets the headers nginx should add while proxying the contents to Ghost/nodejs

proxy_read_timeout 5m; 

proxy_connect_timeout 5m; 

sets a couple of connection parameters.

proxy_pass http://127.0.0.1:1337; 

sets the server nginx should proxy to (in this case it's a nodejs app that is listening on port 1337 on the loopback interface).

As for the proxy_redirect line, see http://wiki.nginx.org/HttpProxyModule#proxy_redirect.

I hope that helps.