🐳 Docker Foundation: Concepts & Architecture¶

These notes cover the core pillars from Docker Deep Dive and Docker: Up & Running to build a foundation for the CKAD exam.

🏗️ 1. The Core Architecture¶

Docker operates on a Client-Server model.

• Docker Client: The CLI tool where you run commands.
• Docker Host (Engine): The daemon (dockerd) that does the heavy lifting.
• Registry: Where images live (Docker Hub, or Oracle Cloud OCIR).

⚙️ The "Big Three" Linux Techs¶

Docker isn't magic; it's just three Linux kernel features wrapped in a nice UI:

1. Namespaces: Provides Isolation (Process, Network, Mount).
2. Control Groups (cgroups): Provides Resource Limiting (CPU, RAM).
3. Union File Systems: Provides Layering (Efficiency).

📦 2. Images vs. Containers¶

Commands¶

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