https://drive.google.com/file/d/18yWtD4FAuaj80HiNS11PVt2GcoHvllkZ/view?usp=sharing

Why Learn Docker in a DevOps Journey?

1. Standardization Across Environments

• Problem: "Works on my machine" syndrome
• Docker Solution: Packages app + dependencies into immutable containers
• Result: Consistent behavior across dev, test, staging, and production

2. Lightweight & Fast Deployment

• Containers vs VMs:
  • VMs: Full OS + hypervisor overhead (GBs, minutes to start)
  • Containers: Share host OS kernel (MBs, seconds to start)
• DevOps Impact: Rapid deployment, scaling, and rollback capabilities

3. Microservices Architecture Enablement

• Isolation: Each service runs independently
• Benefits:
  • Independent scaling
  • Technology flexibility (different languages/frameworks)
  • Fault isolation (one service failure doesn't crash entire system)

4. CI/CD Pipeline Integration

• Build Once, Run Anywhere: Single container image deployed across all environments
• Pipeline Stages:
  • Build → Test → Security Scan → Deploy
• Reliability: Eliminates environment-specific bugs

5. Cloud-Native Portability

• Write Once, Run Anywhere: Same container runs on:
  • On-premises servers
  • AWS ECS/EKS
  • Azure Container Instances
  • Google Cloud Run
• Avoids vendor lock-in