Master Essential Docker Commands: Pull, Run, Inspect, and Clean Up

Docker is an open‑source platform that packages, distributes, and runs applications in lightweight containers, independent of language, framework, or operating system, making it suitable for everything from personal computers to high‑end servers.

1. Pull a Docker Image

Before pulling images, add a host entry to protect against malicious pulls: 127.0.0.1 index.docker.io Edit /etc/hosts with your preferred editor, for example: nano /etc/hosts Then pull the desired image: # docker pull registry.hub.docker.com/busybox Verify the image is available locally:

# docker images

2. Run a Docker Container

Run an interactive container and enter its shell: # docker run -it busybox Exit the shell with Ctrl‑D. To run the container in the background, use: # docker run -itd busybox Attach to a running container using its ID (obtainable via docker ps):

# docker attach <container id>

3. Check Container Status

List running containers: # docker ps List all containers, including stopped ones:

# docker ps -a

4. Inspect Container Information

Retrieve detailed information about a container:

# docker inspect <container id>

5. Stop or Remove Containers and Images

Stop a specific container: # docker stop <container id> Stop all running containers: # docker kill $(docker ps -q) Remove a specific container: # docker rm <container id> Remove all containers (and their images):

# docker rm $(docker ps -aq)

Conclusion

These fundamental Docker commands enable you to pull images, run containers, inspect their state, and clean up resources, providing a simple yet powerful computing platform for developers and operators alike.