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The DevOps 2.0 Toolkit by Viktor Farcic

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Chapter 13. Blue-Green Deployment

Traditionally, we deploy a new release by replacing the current one. The old release is stopped, and the new one is brought up in its place. The problem with this approach is the downtime occurring from the moment the old release is stopped until the new one is fully operational. No matter how quickly you try to do this process, there will be some downtime. That might be only a millisecond, or it can last for minutes or, in extreme situations, even hours. Having monolithic applications introduces additional problems like, for example, the need to wait a considerable amount of time until the application is initialized. People tried to solve this issue in various ways, and most of them used some variation of the ...

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