REPL_Driven_Development_in_DevOps nice.pptx

REPL_Driven_Development_in_DevOps nice.pptx

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  REPL
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  What is REPL? •REPL stands for Read-Eval Print Loop, a programming environment that allows developers to enter code, eva luate it, and see the results immediately. • Reads user input (code) • Evaluates it (executes) • Prints the result • Loops for the next command • Examples: Python, Node.js, Ruby IRB.
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  Benefits of REPLin DevOps 1. Immediate Feedback 2. Exploration and Experimentation 3. Enhanced Learning 4. Documentation and Design Journals 5. Integration with CI/CD
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  Immediate Feedback • REPLsprovide instant feedback on code execu tion, enabling developers to test and validate t heir code in realtime without waiting for lengt hy build processes. This accelerates the develo pment cycle and reduces the time spent debu gging
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  Exploration and Experimentation •Developers can experiment with different code snippets and configurations live. This hands-on approach provides a deeper understanding of system interactions, essential in complex DevOps setups.
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  Enhanced Learning • Developerscan quickly learn new libraries or frameworks by testing them in REPLs, reducing learning curves and improving adaptability.
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  Documentation and DesignJournals • REPL-driven development encourages keeping design journals for documenting experiments and design decisions, aiding in knowledge transfer and future documentation.
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  Integration with CI/CD •REPLs can be integrated into CI/CD pipelines for on-the-fly testing and validation, ensuring higher code quality and minimizing deployment risks.
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  REPL in theContext of DevOps • In DevOps, REPL-driven development supports: • • Rapid prototyping of scripts and automations • • Faster debugging and troubleshooting • • Infrastructure and configuration testing • • Continuous feedback and learning
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  REPL Tools inDevOps • Language/Tool — REPL — Use Case • • Python — python shell — Automation, scripting • • Node.js — node — CI/CD tool testing • • Bash — terminal — Infrastructure automation • • Clojure — nREPL — System scripting • • Terraform — terraform console — Config validation
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  Benefits of REPLin DevOps • • Immediate feedback and testing • • Reduced iteration time • • Enhanced collaboration between Dev and Ops • • Better learning through experimentation • • Quick validation of logic and scripts
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  Example Scenario • Example:Testing AWS deployment in Python REPL • >>> import boto3 • >>> ec2 = boto3.client('ec2') • >>> ec2.describe_instances() • Allows instant testing and validation of cloud configurations.
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  REPL vs TraditionalWorkflow • Traditional Development: • • Slow feedback (compile/run/test) • • Limited experimentation • REPL-Driven Development: • • Instant feedback • • Continuous experimentation • • Live debugging and iteration
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  Challenges & BestPractices • Challenges: • • Not suitable for large codebases • • Reproducibility issues • • Security risks if misused • Best Practices: • • Use REPL in sandbox or staging environments • • Log commands for reproducibility • • Combine with Git for version control • • Automate REPL-tested code into CI/CD
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  Summary • REPL-driven developmentenables: • • Iterative improvement • • Fast experimentation • • Continuous feedback • It aligns perfectly with DevOps principles of automation, collaboration, and continuous delivery.