Beware Of The Spot (Amazon EC2 Pricing)
If your service is running on EC2, you probably already know about Spot Instances . But for those of you who don't, this is a service where Amazon allows you to bid on unused capacity in their data-centers. The pricing varies based on supply and demand, but is typically somewhere between 25% and 50% the cost of a "reserved" instance (e.g., right now, a "Small" on-demand instance is $0.085/hr, while the spot cost is $0.027/hr). Amazon has done a lot of work in making these very easy to use, everything from the bidding, to the setup, to VPC integration. As you might imagine, this has not gone un-noticed, and there are any number of companies that have gone the spot right towards their infrastructure - using them to soak up the load associated with excess capacity. You even have guides out there on how to setup and use spot instances, a sure sign that its ubiquitous. So, whats the catch? As it turns out, the correct question is, what are the two catc...