In my previous blog I’ve written about the hard work needed to successfully migrate applications to the cloud. But why go through all that work to get to the cloud? It’s to take advantage of the dynamic nature of the cloud with the ability (and agility) to quickly scale applications. Your application’s load probably changes all day, all week, and all year. Now your application can utilize more or less resources based on the changes in load. Just ask the cloud for as much computing resources that you need at any given time, and unlike at data centers, the resources are available at the push of a button.
But that only works during the marketing video. Back in the real world, no one can find that magic button to push. Instead scaling in the cloud involves pushing many buttons, running many scripts, configuring various software, and then fixing whatever didn’t quite work. Oh, and of course even that is the easy part, compared to actually knowing when to scale, how much to scale and even what parts of your application to scale. And this repeats all day, every day, at least until everyone gets discouraged.