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Release It!, 2nd Edition by Michael T. Nygard

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Code

Even before we get to questions about containers versus VM images, we should look at some things about the code.

Building the Code

Developers naturally pay a lot of attention to their code. As a result, we have great tools at our disposal to build, house, and deploy code. There are some important rules to follow, though. These are mostly about making sure that you know exactly what goes into the code on the instance. It is vital to establish a strong “chain of custody” that stretches from the developer through to the production instance. It must be impossible for an unauthorized party to sneak code into your system.

It starts at the desktop. Developers should work on code within a version control system. There’s simply no excuse not ...

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