July 2013
Intermediate to advanced
144 pages
3h 50m
English
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Chapter 4. Moving Legacy Apps to PaaS
Everyone has skeletons in their closets. Skeletons come in the form of technical debt, the applications written in Cobol, the spaghetti code that we always meant to clean up, that undocumented application that a coworker wrote before leaving, and all those applications that have been around for 10 years and nobody knows how they work anymore. These are commonly called legacy applications.
Developing apps in the cloud requires a new worldview and often adds a few different programming paradigms. While legacy applications can be adapted to work within PaaS, there is a common set of challenges to make them run well.
Fortunately, the changes needed to run your legacy apps in PaaS are also known as best practices today. These are the same changes you would need to make to your app if you just wanted to make it more reliable and robust, whether or not you ran it on a PaaS.
Initial Considerations
When you’re developing applications for the cloud, there are certain assumptions you need to be aware of. This is true whether you’re developing on IaaS or PaaS.
If you’re deploying legacy apps to IaaS, the main benefit is the ability to provision virtual machines faster. The downside is that the virtual machines are usually ephemeral: they can go down; they’re not typically reliable or robust. This forces you into thinking about building an application in a way that can be redundant, with your app running across many different servers.
This way of thinking is different ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.