https://drive.google.com/file/d/1nWKqMfBCGz9XAmlJTQ1jE0EhgIVS2kky/view?usp=sharing

1. What is Docker? (History & Purpose)

Historical Context

• 2008: Solomon Hykes founded dotCloud (PaaS company)
• 2013: Docker open-sourced at PyCon, revolutionizing containerization
• 2014: Docker 1.0 released, massive adoption begins
• 2015: Open Container Initiative (OCI) formed to standardize containers
• 2017: Docker splits into Docker CE (Community Edition) and EE (Enterprise Edition)

Why Docker Exists

Pre-Docker Problems:

• "Works on my machine" syndrome: Inconsistent environments between dev, test, prod
• Dependency hell: Conflicting library versions across applications
• Resource inefficiency: VMs consume significant overhead
• Slow deployments: Manual configuration and setup

Docker's Solution:

• Containerization: Package application + dependencies into isolated, portable units
• Immutable infrastructure: Build once, run anywhere
• Lightweight virtualization: Share host OS kernel for efficiency