DevOps and Release Strategies

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Clues

Tools,scripts or products that automatically install & configure a given version of an application
Software architecture design pattern,in which complex applications are composed of small processes
A go-live strategy in which a new application version is released to a small subset of production
A go-live strategy in which code implementing new features is released to a subset of the production
Testing of end-to-end system to verify that existing functionality has not been negatively impacted