SDET Interview Preparation - Docker: Part-I

1. Introduction to Docker:

Docker is an open-source platform that automates the deployment, scaling, and management of applications using containerization. It allows developers to package an application with all its dependencies into a standardized unit for software development.

Understand what Docker is, its purpose, and why it's used in software development and testing.

2. Docker Architecture:

Docker uses a client-server architecture. The Docker client communicates with the Docker daemon, which builds, runs, and manages Docker containers. Docker Images are read-only templates used to create containers, and Dockerfile is a text file that contains instructions to build a Docker image.

Learn about Docker's architecture, including concepts like Docker Engine, Docker Images, Docker Containers, and Dockerfile.

3. Docker Installation and Setup:

This involves downloading Docker, installing it on your system, and verifying the installation by running a simple Docker command.

Understand how to install Docker and set it up on your system.

4. Docker Images:

Docker images are created using a Dockerfile. You can also pull existing images from Docker Hub, a cloud-based registry service that allows you to link code repositories, build details, and more.

Learn how to create Docker images using Dockerfile, how to use existing Docker images, and how to push and pull images from Docker Hub.

5. Docker Containers:

A Docker container is a running instance of a Docker image. You can create, start, stop, and remove containers using Docker commands.

Understand how to create, start, stop, and remove Docker containers. Learn about container lifecycle management.

6. Docker Commands:

Essential Docker commands include docker run, docker ps, docker pull, docker build, docker push, and more.

Learn essential Docker commands for managing images and containers.

7. Docker Networking:

Docker provides network drivers to enable network communications between containers. Understand the different types of network drivers and how to use them.

Understand Docker's networking capabilities, including the use of network drivers and how to establish network communications between containers.

8. Docker Volumes:

Docker volumes are used to persist data and share data among containers. They are managed by Docker and can be more efficient than other options.

Learn about Docker volumes and how they're used to persist data and share data between containers.

9. Docker Compose:

Docker Compose is a tool for defining and managing multi-container Docker applications. It uses YAML files to configure application services.

Understand how to use Docker Compose to define and run multi-container Docker applications.

10. Docker Swarm:

Docker Swarm is a container orchestration tool built into Docker. It allows you to manage a swarm of Docker nodes and deploy services onto them.

Learn about Docker Swarm and how it's used to manage a cluster of Docker nodes and deploy services onto them.

11. Docker in CI/CD pipeline:

Docker can be integrated into CI/CD pipelines to provide a consistent environment for building, testing, and deploying applications.

Understand how Docker fits into a Continuous Integration/Continuous Deployment (CI/CD) pipeline.

12. Docker Security:

Docker security involves securing the Docker host, Docker images, and containers. It also involves implementing best practices like using non-root users in containers and signing images.

Learn about Docker security practices, including image security, container security, and using Docker in a secure way.

13. Best Practices:

These include minimizing the number of layers in images, using .dockerignore files, not running processes as root in containers, and regularly updating images.

Learn the best practices for using Docker, including image creation, container management, and more.

14. Troubleshooting Common Issues:

Common issues can include problems with Docker installation, Docker daemon not starting, issues with Docker images or containers, and network issues.

Understand common issues that can arise when using Docker and how to troubleshoot them.

15. Advanced Docker Concepts:

This includes understanding how to optimize Dockerfiles, use Docker APIs, and use Docker with orchestration tools like Kubernetes.

Cover advanced topics like Dockerfile optimization, Docker APIs, and using Docker with orchestration tools like Kubernetes.

You can also connect with me to upskill in Docker for Containerization through personalized long-term mentorship on Preplaced.

You can book a free trial session on Preplaced!