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Web Hosting and Cloud Computing Control Panels
Howdy,
Well, by default -- DNS, SMTP (Postfix), IMAP/POP (Dovecot), and SSH listen on every IP address on the server, rather than being tied to one specific IP address.
But, you can add additional IP addresses to your server by going into Webmin -> Networking -> Network Configuration -> Network Interfaces.
Websites running on Apache do indeed use one specific IP by default. That IP address is shared amongst all the websites (unless it's told otherwise).
Could you tie those daemons to one specific IP, rather than having them listen on all IP addresses? Yes, but you'd have to manually reconfigure each of their config files to do that. I'd probably suggest having them listen on all interfaces as they do by default :-)
Can you later use one of those IP addresses on another server as a secondary DNS server? Sure! Instructions for setting up a secondary DNS are here:
http://www.virtualmin.com/documentation/dns/slave-configuration
The question indeed is, what would be the advantage of having a separate IP per service? That is usually what port numbers are for, in terms of e.g. setting up firewall rules. IP addresses identify hosts, not services.
The exception is SSL websites, which do need a separate IP each, due to the way the SSL setup works.
im just thinking that i have a box set up with virtualmin, well two boxes NS1 and NS2 and i would like to later add some more servers to my "cluster" so NS1, NS2, WWW, Email, and maybe a front end for all of this and i just wanted to no assign the IP to the box and have all the services run on that one IP but rather assign a Management IP for the BOX and then Virtual Eth0:1 interfaces with the other IPs on, then i can move the IP to another box and it should then be easyer etc ....
i currently have
NS1 eth0 1.1.1.1 as management eth0:1 1.1.1.2 WWW, SMTP, POP/IMAP, DNS
NS2 eth0 1.1.1.3 as management eth0:1 1.1.1.4 WWW, SMTP, POP/IMAP, DNS
but on a upcoming project i want to define IPs to the virtual Eth addresses and use some thing like
UPCOMINGSERVER01 eth0 1.1.1.1 Management eth0:1 1.1.1.2 WWW eth0:2 1.1.1.3 SMTP eth0:3 1.1.1.4 POP/IMAP eth0:4 1.1.1.5 DNS
UPCOMINGSERVER02 eth0 1.1.1.6 Management eth0:1 1.1.1.7 WWW eth0:2 1.1.1.8 SMTP eth0:3 1.1.1.9 POP/IMAP eth0:4 1.1.1.10 DNS
Also if later on in a differant project i wanted to have WWW, DNS, SMTP, IMAP/POP on all serperate boxes is there a central web admin panel that i can enter all the details on to and it then assigns all the services out to the differant servers etc ...