Series · 7 parts

7 Days of Docker

A week-long journey from your first docker run to production-ready containers.

Saloni Narang's seven-day deep dive through Docker, taking you from "what actually happens when you type docker run" all the way to shipping hardened containers with policy guardrails. Each day stands alone, but read together they're the practical Docker reference every cloud-native engineer wishes existed.

Saloni Narang

Written by

Saloni Narang
  1. 01

    Part 1 · Apr 22, 2026 · 11 min

    Day 1: What Actually Happens When You Type docker run

    Containers aren't VMs. They're Linux processes. A Docker Captain explains namespaces, cgroups, and how Docker really works on your Mac in 2026.

  2. 02

    Part 2 · Apr 23, 2026 · 10 min

    Day 2: Your Images Are a Supply Chain - and It's Probably Broken

    7 Days of Docker (2026) - by Saloni Narang, Docker Captain & CNCF Ambassador I'm a Docker Captain. I've seen hundreds of Docker tutorials explain images…

  3. 03

    Part 3 · Apr 24, 2026 · 14 min

    Day 3: Stop Writing Dockerfiles From Scratch

    Stop writing Dockerfiles from scratch. A Docker Captain walks through docker init, layer caching, multi-stage builds, and docker debug for 2026.

  4. 04

    Part 4 · Apr 27, 2026 · 15 min

    Day 4: Breaking Isolation on Purpose - Volumes, Networks, and the Real World

    7 Days of Docker in 2026 — When Containers Need to Talk and Remember On Day 3, you built production-ready images with Dockerfiles, optimized layers, and…

  5. 05

    Part 5 · Apr 28, 2026 · 16 min

    Day 5: Docker Compose - How Docker Actually Gets Used

    7 Days of Docker in 2026 - From docker run Chaos to Declarative Stacks Nobody types docker run with 15 flags in real life. I’ve been learning and working…

  6. 06

    Part 6 · Apr 30, 2026 · 10 min

    Day 6: Run an LLM on Your Laptop - With Docker

    "Pull AI models from Docker Hub, run them locally with GPU acceleration, and build an AI-powered app

  7. 07

    Part 7 · May 4, 2026 · 13 min

    Day 7: Ship It - and What Comes Next

    Your container runs as root and has 18 CVEs. A Docker Captain's guide to hardening, Scout policies, DHI, Sandboxes, and what comes after Docker.