Questions[bind](ubuntu)

I am confused. Linux filesystem is a tree structure, with the root node(starting node) as the root directory. Now let's suppose I have a folder abc at location /home/abc and another folder xyz at location /home/xyz

Folder xyz consists of some other folders and files inside it. (ex def and mno are folders inside it)

/
├── home/
│   ├── abc
│   └── xyz
│       ├── def
│       └── mno

When I run the command

mount --rbind /home/xyz /home/abc

(rbind is recursively bind) I see all the contents of the folder xyz in abc. Now, when I just run the command

mount --bind /home/xyz /home/abc

I still see all the contents of xyz in abc.

Why is that?

--bind to work just as similarly to --rbind.

I need a complete step-by-step guide on how to produce such a server configuration.

Can anyone help-me?

Usually after $TTL and $ORIGIN there is a line starting with @ and IN in zone name then email address of admin, what does @ mean here and in the next entries?

I want to have strong DNS cache server on my local host (server). So I need to change name server to my localhost.

1. How can I change it? byt this config it seems I must don't change it via editor so how can I change it?

   root@asqar# cat /etc/resolv.conf 
   # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
   #     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
   nameserver 4.2.2.4
   search asqar.net
   

2. I'm using bind9 how can I set the DNS cache, any configure ?

I have ubuntu 10.10 installed, and when I hit my IP I see:

It works!

This is the default web page for this server.

The web server software is running but no content has been added, yet.

Where should I look to see where this is being served from?

The strange thing is, I just installed nginx and setup a static page that is served on port 80 also (should be conflicting with the default apache that is serving the 'it works page'), when I restart nginx I don't get bind error sayign port 80 is already taken.

I dont' use apache, and don't want it but the default install seems to have it. I ahve no idea where it is, I don't see it in /opt or etc/apache .

thanks!