debugging Docker Docker & Containers: From Zero to Production Docker Containers Module 3 — Working with Containers

Executing Commands Inside Running Containers with docker exec

Reviewed & accurate

AI Summary

R Ram Pothuraju October 07, 2026 Reading…

What You'll Learn

Beginner

How to run commands inside a running container
How to open an interactive shell
When to use exec vs run

Terminalbash

# Open an interactive shell
docker exec -it web bash

# Run a single command
docker exec web ls /etc

# Run as root
docker exec -u root web whoami

docker run	docker exec
Creates a new container	Runs command in existing container
Container must not exist	Container must be running

Practical Exercise

Run docker exec -it <name> bash

Run a one-off command with docker exec

Compare with docker run

Key Takeaways

docker exec <name> <command> runs a command in a running container.
docker exec -it <name> bash opens an interactive shell.
Use exec for debugging — not for permanent changes.

Previously: Lesson 18 covered logging.
Today: You learned: Run commands inside running containers without stopping them.
Next: Lesson 20 covers copying files.

How did you find this?

Comments

Join the discussion! Sign in with your Google or Blogger account, or comment as Anonymous - no account needed. For quick questions, also reach me on Telegram @cytestch.

What You'll Learn

Practical Exercise

Key Takeaways

Comments

Comments

Post a Comment