Day 1: Kicking Off #40DaysOfKubernetes

Today marks the beginning of my journey into the world of Kubernetes, inspired by the incredible work of Piyush Sachdeva. Over the next 40 days, I’ll be diving deep into the concepts, practices, and tools that make Kubernetes an essential skill for modern DevOps. Let’s get started with what I learned on Day 1!

Traditional Build Promotion (Waterfall Methodology)

The traditional approach to build promotion follows the waterfall methodology. This sequential design process consists of distinct phases:

1. Requirement Analysis
2. System Design
3. Implementation
4. Integration and Testing
5. Deployment
6. Maintenance

While this methodical approach ensures each phase is thoroughly completed before moving on to the next, it can be rigid and slow to adapt to changes.

Build Promotion the Docker Way

Docker revolutionizes build promotion by using containers. Containers are lightweight, standalone, and executable software packages that include everything needed to run a piece of software, including the code, runtime, system tools, libraries, and settings. This approach facilitates continuous integration and continuous deployment (CI/CD), allowing for rapid and consistent application delivery.

Docker

Isolated Environments with Docker (and Podman)

Containers provide isolated environments for applications, ensuring that each application runs with its own dependencies and configurations, free from conflicts with other applications. Docker is a popular containerization tool, but there’s also Podman, an alternative that offers similar functionality with the added benefit of daemonless and rootless containers, enhancing security.

Containers vs. Virtual Machines (VMs)

While both containers and VMs provide isolated environments for applications, they differ significantly:

• VMs: Virtualize the entire hardware, including the operating system. They are heavyweight and consume more resources.
• Containers: Virtualize the operating system, sharing the kernel with the host machine but isolating the application processes. They are lightweight and use fewer resources.

Docker Flow

The Docker workflow typically involves the following steps:

1. Build: Create a Docker image from a Dockerfile.
2. Push: Upload the image to an intermediate registry or Docker Hub.
3. Pull: Download the image from the registry.
4. Run: Deploy the container from the image.

By using Docker Hub or a private registry, teams can manage and distribute Docker images efficiently.

Docker Architecture

Docker’s architecture consists of several key components:

• Docker Client: The interface through which users interact with Docker.
• Docker Daemon: The background service responsible for managing Docker containers.
• Docker Images: Read-only templates used to create containers.
• Docker Containers: Instances of Docker images that run applications.
• Docker Registries: Repositories that store Docker images, such as Docker Hub.

Day 1 Task: Docker Architecture and Workflow Diagram

To solidify today’s learning, I created a Docker architecture and workflow diagram using Earse.io. This visual representation helps in understanding how Docker components interact and the lifecycle of a Docker container from building to deployment.

Docker Architecture

Docker Workflow

With Day 1 completed, I am excited to continue this journey and delve deeper into Kubernetes. Stay tuned for more insights and learning as I progress through #40DaysOfKubernetes!

Link for reference : https://youtu.be/ul96dslvVwY?si=CIQbJWmalEBU7_3_

GitHub link: https://github.com/Christober-S/-40DaysOfKubernetes-

Feel free to leave comments, suggestions, or questions below. Let’s learn together!