Create subdomain on Nginx + Bind9 on Ubuntu server 12.04

1. Edit you bind & dns config
Insert this to db.domain.net

blog    IN    CNAME    domain.net.

2. Edit /etc/nginx/sites-available/default
Add this:

server {
    listen 80;
    root /usr/share/nginx/www;
    index index.php index.html index.htm;

    server_name domain.net;
[…]
}

server {
    listen 80;
    root /usr/share/nginx/www/blog;              <-- change this if you want
    index index.php index.html index.htm;

    server_name blog.domain.net;
[…]
}

3. Create new folder at /usr/share/nginx/www/blog

4. Put your file accordingly in the folder

5. Test open the URL e.g. blog.domain.net