SDLC & DevOps-Introduction
SDLC – Software Development Life Cycle (In Detail)
SDLC is a structured process that helps software developers build high-quality software in a systematic way. It involves different steps and methods to develop and maintain software efficiently.
Phases of SDLC (With Explanation)
Requirement Phase
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This is the first and most important step after planning.
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In this phase, the development team meets the client to understand what kind of software they want.
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Every small detail like features, design ideas, user needs, etc., are discussed and written down.
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The main goal is to gather full and clear requirements so nothing is missed later.
Design Phase
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In this phase, a blueprint (design plan) of the software is created.
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It includes system architecture, data models, user interface designs, and how each part of the system will work.
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Developers and designers work together to make sure the software design matches the client’s expectations.
Development Phase
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After the design is ready, the actual coding begins in this phase.
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Developers select the right programming languages, tools, and frameworks to build the software.
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The application is developed module by module (step-by-step).
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This is the core part where the software starts taking shape.
Testing Phase
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After development, the software is tested to check:
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If it is working correctly
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If there are any bugs or errors
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If it meets the client’s requirements
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Different types of testing are done like unit testing, integration testing, system testing, user testing etc.
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The goal is to fix issues before the software is released.
Implementation Phase
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Once the testing is successful, the software is deployed (launched) to the live environment.
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Real users start using the software.
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This phase is also called the deployment phase, and it includes final setup and configurations.
Maintenance Phase
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This is the long-term support phase.
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After users start using the software, they might face some problems or need changes.
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Developers continuously monitor the system and provide updates, fixes, and improvements.
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This phase ensures the software remains useful and up-to-date.
SDLC & DevOps-Introduction (In Detail)
Different methodologies are used to follow SDLC based on project needs. Here are the three most common:
Waterfall Methodology
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One of the oldest and simplest models.
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Each step is completed one after another (like water flowing down steps).
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You can’t go back to the previous step once it’s completed.
Advantages:
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Easy to manage for small projects.
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Everything is well-documented and planned in advance.
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Deadlines and goals are clearly defined.
Disadvantages:
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Not flexible – changes are hard to manage.
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Not ideal for big or long-term projects.
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Difficult to fix mistakes found later.
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Can delay feedback as clients see the product only at the end.
Agile Methodology
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Agile is an iterative and flexible method.
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The project is broken into small parts called iterations or sprints (1–3 weeks).
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After each sprint, a working version of the software is shown to the client for feedback.
Advantages:
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Promotes team collaboration and fast feedback.
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Great for projects where requirements change frequently.
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New features are delivered quickly.
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Encourages learning and improvement after each sprint.
Disadvantages:
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Needs strong project leadership and good planning.
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Too much dependence on customer communication.
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Less documentation makes it hard for new team members to understand the project quickly.
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If customer is confused or unclear, project may go in the wrong direction.
DevOps Methodology
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DevOps stands for Development + Operations.
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It focuses on team collaboration, automation, and continuous delivery.
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DevOps helps to build, test, and release software faster and more reliably.
Key Features:
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Developers and IT operations team work together.
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Automation tools are used for testing, integration, and deployment.
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Software is delivered in small, frequent updates.
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Focus on monitoring and improving software continuously.
Benefits:
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Faster delivery of software
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Fewer errors during deployment
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Better team communication and quick response to issues
Conclusion:
Each SDLC methodology has its own strengths.
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Use Waterfall for simple, short-term projects with clear requirements.
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Use Agile for projects with changing needs and close client involvement.
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Use DevOps when speed, automation, and ongoing improvements are important.
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