What is DevOps

**FUNDAMENTALS OF DEVOPS**

DevOps is a culture and process aimed at improving application delivery by ensuring proper automation, maintaining code quality, continuous monitoring, and ongoing testing.

To understand DevOps, we first need to define the Software Development Life Cycle (SDLC).

**SDLC (Software Development Life Cycle)**: The SDLC is a process followed by industries to design, develop, and test high-quality software products.

DevOps engineers streamline the processes of building, testing, and deploying applications quickly, efficiently, and in an automated manner.

**Steps Involved in SDLC:**

1. **Planning**: The planning phase is the initial and critical stage of the SDLC, where the foundation of the project is established. During this phase, a timeline is created along with overall goals, scope, and objectives. The required resources, including personnel, technology, budget, and time, are identified, along with potential risks and challenges.

2. **Designing**: In the designing phase, a detailed blueprint for the software is created. This includes database design, user interface (UI) design, technology and tools selection, and security and performance considerations. Detailed designs for each module or component are developed, outlining functionalities, algorithms, and logic.

3. **Building**: The building phase in DevOps, often referred to as Continuous Integration (CI), includes several activities such as source code integration, automated build processes, automated testing, code quality checks, artifact management, feedback loops, security scanning, and preparation for continuous delivery.

4. **Testing**: The testing phase ensures that the software meets required quality standards and functions as expected. It focuses on identifying and fixing any issues before the software is deployed to production. There are various types of testing, including unit testing, integration testing, system testing, acceptance testing, performance testing, and security testing.

5. **Deployment**: In the deployment phase of the SDLC, decisions are made regarding the deployment strategy (e.g., phased rollout, big bang deployment, blue-green deployment). A rollback plan is prepared in case the deployment fails or causes issues. Deployment involves installing the software, migrating the database, and configuring environment-specific settings, such as API keys and environment variables, to ensure the software functions as intended in the real world.