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I've been reading about DNS failovers and a bunch of other technical terms however I'm a bit of a newbie in this so it all sounds Greek to me. Basically here's what I just need:

I have two shared hosting accounts from two different providers (Server A and Server B). Each of this accounts contain exactly the same website content.

On a normal day, typing my domain name should point to the IP of Server A. But on a bad day in which Server A is down or unreachable, my domain name should point to the IP of Server B in the fastest way possible.

How do you achieve this and what services can you recommend if any? Thanks.

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1 Answer 1

up vote 2 down vote accepted

The simple answer is to use a content distribution/delivery network to handle your traffic. They already have the infrastructure in place to handle failover like this.

If you must host it yourself, one route to take is this:

  • Set the DNS TTL very low
  • Set up a server which monitors the web servers
  • If one of the web servers goes down, automate a script on the monitoring server to modify the DNS and remove the failed server

My first recommendation is still to use a CDN, though.

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Thanks for the reply. Can a CDN be used as a host for an entire website? I thought it's only used for storage. –  IMB Mar 25 '11 at 19:53
    
CDNs are generally best for static content (HTML, JS, CSS, images, etc), but some CDN hosts offer whole site delivery for sites with server-side applications. It's not cheap, though, but 99.999% uptime never is. –  Hyppy Mar 25 '11 at 20:03
    
If that's the case then I would need a CDN that offers whole site delivery because a normal CDN implementation will not achieve my goal right? –  IMB Mar 25 '11 at 20:19
    
I don't know. Do you run any server-side applications? –  Hyppy Mar 25 '11 at 20:22
1  
Search for 'DNS failover'. Some companies offer it inexpensively. –  Seun Osewa May 9 '11 at 4:49

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