How to Use docker commit | Create Custom Image from Running Container | Day 11
🐳 Welcome to Day 11 of the Docker Zero to Hero series!
In this video I'll explain what docker commit is, why it exists,
real world use cases where it is needed and show you a
complete hands on demo — going inside a running container,
making changes and saving those changes as a brand new
Docker image using docker commit!
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🎯 WHY DOCKER COMMIT IS USEFUL TO KNOW
Normally you create Docker images using a Dockerfile.
But sometimes you need to capture the current state
of a running container as an image — quickly, without
writing or modifying a Dockerfile.
Maybe you went inside a container, installed some packages,
made some configuration changes and want to save
that exact state as a new image for reuse.
That is exactly what docker commit does.
This is a real world skill used in debugging,
prototyping and quick image creation scenarios
that every DevOps engineer should know.
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📌 WHAT YOU WILL LEARN IN THIS VIDEO
✅ What is docker commit and what it does
✅ Why docker commit exists and when to use it
✅ How to run a container and make changes inside it
✅ How to save container changes as a new Docker image
✅ Exact docker commit command with options
✅ How to verify new image is created correctly
✅ Real world use cases for docker commit
✅ When docker commit is better than writing a Dockerfile
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🔍 WHO IS THIS VIDEO FOR
This video is perfect for you if you are:
👉 A Docker beginner learning advanced Docker commands
👉 A DevOps engineer who debugs containers regularly
👉 Someone who wants to quickly snapshot a container state
👉 A developer prototyping and testing Docker environments
👉 Anyone preparing for Docker or DevOps interviews
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💡 HOW DOCKER COMMIT WORKS
Step 1 — Run a Container
→ Start any container interactively
→ docker run -it ubuntu /bin/bash
→ You are now inside the running container
Step 2 — Make Changes Inside Container
→ Install packages, create files, modify configs
→ apt-get install -y curl
→ These changes exist only in this container for now
Step 3 — Commit Container as New Image
→ Open a new terminal
→ docker commit container-id myimage:v1
→ Docker captures current container state as new image
Step 4 — Verify New Image
→ docker images — new image appears in list
→ docker run myimage:v1 — runs with all your changes
→ All modifications from inside container are preserved
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💡 REAL WORLD USE CASES
→ Debugging — capture container state when issue occurs
Save it as image to reproduce and investigate later
→ Prototyping — quickly test packages and configs
Commit working state before moving to proper Dockerfile
→ Emergency fixes — make urgent changes to running conta