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by: Bernard Teo

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Thu 16 Mar 2006

Round Robin

Category : Technology/RoundRobin.txt

I've tested that I could use DNS Enabler to set up something like this (focus on the box outlined in red):

This is called a round-robin arrangement. Three machines -, 245 and 250 are all given the domain name "another.domain", and all store the same content.

Now what happens is, when a hit comes in for "another.domain", the name server will channel the request to be served by the machine on address

Then, when another hit comes in for "another.domain", the name server will channel it to next. When a third hit comes in, it gets channeled to Finally, when a fourth hit comes in, the name server sends it back to, and around it goes again.

The end result is that the load for the domain "another.domain" gets distributed across three different servers. If you have a database, you need to abstract it out to a different machine that all three servers access. But in this way, you can upsize your operations by adding more servers as your business expands.

So, our tools are all coming together nicely.

Posted at 4:34PM UTC | permalink

Put your Mac to Work Now how would you do something like that?

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DNS Enabler for Mavericks

DNS Agent for Mavericks

WebMon for Mavericks

Luca for Mavericks

Liya for Mountain Lion & Mavericks

Postfix Enabler for Tiger and Panther

Sendmail Enabler for Jaguar

Services running on this server, a Mac Mini running Mac OS X 10.9.2 Mavericks:

  • Apache 2 Web Server
  • Postfix Mail Server
  • Dovecot IMAP Server
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  • Procmail
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  • WebDAV Server
  • VPN Server
  • PHP-based weblog
  • MySQL database
  • PostgreSQL database

all set up using MailServe, WebMon, DNS Enabler, DNS Agent, VPN Enabler, Liya and our SQL installers, all on Mavericks.