Introduction of Docker Workflows with CircleCI 
This course provides a comprehensive guide to building and managing Docker-based workflows with CircleCI. Learn how to create efficient, containerized CI/CD pipelines, streamline deployments, and enhance build consistency using Docker. Master the integration of Docker with CircleCI for robust, scalable, and secure software delivery.

Prerequisites

• Basic understanding of Docker and containerization concepts
• Familiarity with CircleCI and YAML configuration files
• Knowledge of CI/CD workflows and version control systems

Table of Contents

1. Introduction to Docker in CI/CD
1.1 Why Use Docker in CI/CD Pipelines?
1.2 Benefits of Dockerized Workflows with CircleCI
1.3 Overview of Docker and CircleCI Capabilities

2. Setting Up Docker with CircleCI
2.1 Preparing the Environment: Installing Docker Locally
2.2 Using Docker Executors in CircleCI Pipelines
2.3 Configuring Docker Layers for Efficient Builds

3. Building Docker Images in CircleCI
3.1 Writing Dockerfiles for CI/CD Pipelines(Ref: Scaling CI/CD with CircleCI: Best Practices for Teams )
3.2 Building Docker Images in CircleCI Jobs
3.3 Tagging, Pushing, and Storing Images in Docker Registries

4. Using Pre-Built Docker Images
4.1 Leveraging CircleCI’s Prebuilt Docker Images
4.2 Integrating Third-Party Docker Images from Docker Hub
4.3 Customizing Base Images for Specific CI/CD Needs

5. Automating Tests in Dockerized Workflows
5.1 Running Unit and Integration Tests Inside Docker Containers
5.2 Isolating Environments for Parallel Testing
5.3 Managing Test Reports and Logs in Docker Workflows

6. Multi-Stage Docker Builds
6.1 Implementing Multi-Stage Builds for Optimized Images
6.2 Reducing Build Times and Image Sizes with Best Practices
6.3 Debugging Multi-Stage Docker Builds in CircleCI

7. Deploying Dockerized Applications
7.1 Automating Deployments to Docker Swarm and Kubernetes
7.2 Pushing Images to Docker Hub and Private Registries
7.3 Rolling Out Updates Using Blue/Green Deployments and Canary Releases

8. Caching and Optimization in Docker Workflows
8.1 Using CircleCI Caching to Accelerate Builds
8.2 Optimizing Docker Layer Caching for Faster Pipelines
8.3 Best Practices for Reducing Docker Image Build Times

9. Security and Compliance in Docker Workflows
9.1 Scanning Docker Images for Vulnerabilities
9.2 Managing Secrets with CircleCI Contexts and Environment Variables
9.3 Implementing Role-Based Access Control for Docker Workflows

10. Debugging and Monitoring Docker Pipelines
10.1 Analyzing Build Logs and Docker Events in CircleCI
10.2 Debugging Failed Builds and Container Errors
10.3 Using CircleCI Insights for Workflow Performance Monitoring

11. Advanced Docker Workflows
11.1 Orchestrating Complex Pipelines with Docker and CircleCI
11.2 Managing Multi-Service Applications with Docker Compose
11.3 Scaling Docker Workflows for Large Teams and Projects

12. Best Practices for Docker Workflows with CircleCI
12.1 Ensuring Consistency Across Development and Production Environments
12.2 Standardizing Docker Pipelines Across Teams
12.3 Continuous Improvement for Docker CI/CD Processes

Conclusion
CircleCI and Docker together create a powerful combination for managing efficient, scalable CI/CD pipelines. By mastering Docker workflows with CircleCI, you can ensure consistent builds, seamless deployments, and optimized performance, enabling your team to deliver high-quality software rapidly

Reference