Docker Commands Cheat Sheet for Developers

Docker has become one of the most important tools for modern software development and DevOps. It allows developers to package applications with all dependencies into lightweight containers, ensuring that applications run consistently across different environments.

Whether you are a backend developer, DevOps engineer, or full-stack developer, learning Docker commands can significantly improve your deployment workflow.

In this guide, we will cover the most commonly used Docker commands categorized into Images, Containers, Volumes, Networks, DockerHub, and Troubleshooting.

What is Docker?

Docker is an open-source platform that allows developers to build, ship, and run applications inside containers.

Containers are lightweight, portable environments that include everything needed to run an application:

• Application code
• Runtime
• System libraries
• Dependencies

This ensures your application works the same way on:

• Local machine
• Testing server
• Production server
• Cloud environments

Docker Image Commands

Docker images are the blueprints used to create containers. They contain the application and all required dependencies.

List all local images

docker images

Displays all Docker images stored on your local system.

Delete an image

docker rmi <image_name>

Removes a Docker image from the local system.

Example:

docker rmi nginx

Remove unused images

docker image prune

Deletes unused images that are not associated with any containers.

Build an image from a Dockerfile

docker build -t <image_name>:<version> .

Builds a Docker image using a Dockerfile.

Example:

docker build -t myapp:v1 .

Build an image without cache

docker build -t <image_name>:<version> . --no-cache

Forces Docker to rebuild all layers instead of using cached layers.

Docker Container Commands

Containers are running instances of Docker images.

List all containers (running + stopped)

docker ps -a

Displays all containers on the system.

List running containers

docker ps

Shows only containers that are currently running.

Run a new container

docker run <image_name>

If the image is not available locally, Docker will automatically download it from DockerHub.

Example:

docker run nginx

Run container in background (detached mode)

docker run -d <image_name>

The container runs in the background without blocking the terminal.

Run container with custom name

docker run --name <container_name> <image_name>

Example:

docker run --name my-nginx nginx

Port Binding

Port binding allows the container application to be accessed from the host machine.

docker run -p <host_port>:<container_port> <image_name>

Example:

docker run -p 8080:80 nginx

Now the application can be accessed at:

http://localhost:8080

Set environment variables

docker run -e <var_name>=<var_value> <image_name>

Example:

docker run -e MYSQL_ROOT_PASSWORD=123456 mysql

Start or stop a container

docker start <container_name>
docker stop <container_name>

Example:

docker stop my-nginx

Inspect container details

docker inspect <container_name>

Shows detailed configuration and metadata of a container.

Delete a container

docker rm <container_name>

Removes a stopped container from the system.

Docker Troubleshooting Commands

These commands help debug issues with running containers.

Fetch container logs

docker logs <container_name>

Shows logs generated by the container.

Access shell inside container

docker exec -it <container_name> /bin/bash

or

docker exec -it <container_name> sh

This opens an interactive terminal inside the container.

DockerHub Commands

DockerHub is a public repository for Docker images.

Pull an image from DockerHub

docker pull <image_name>

Example:

docker pull nginx

Push image to DockerHub

docker push <username>/<image_name>

Example:

docker push abdul/myapp

Login to DockerHub

docker login -u <username>

or

docker login

Logout:

docker logout

Search images on DockerHub

docker search <image_name>

Example:

docker search mysql

Docker Volume Commands

Volumes allow containers to store persistent data outside the container filesystem.

List all volumes

docker volume ls

Create a named volume

docker volume create <volume_name>

Example:

docker volume create mysql_data

Delete a volume

docker volume rm <volume_name>

Mount named volume

docker run --volume <volume_name>:<mount_path>

Example:

docker run --volume mysql_data:/var/lib/mysql mysql

Mount volume using --mount

docker run --mount type=volume,src=<volume_name>,dest=<mount_path>

Anonymous volume

docker run --volume <mount_path>

Docker automatically creates the volume.

Bind mount (host directory)

docker run --volume <host_path>:<container_path>

Example:

docker run --volume /home/project:/app node

Remove unused volumes

docker volume prune

Removes unused anonymous volumes.

Docker Network Commands

Docker networks allow containers to communicate with each other securely.

List networks

docker network ls

Create a network

docker network create <network_name>

Example:

docker network create app-network

Remove a network

docker network rm <network_name>

Remove unused networks

docker network prune

FAQ (30 FAQs)

1 What is Docker used for?

For building, deploying, and running applications inside containers.

2 What is containerization?

Running applications inside isolated containers.

3 Is Docker better than virtual machines?

Docker is lighter and faster.

4 Who created Docker?

Docker was created by Solomon Hykes.

5 Is Docker used in DevOps?

Yes, widely.

6 Can Docker run databases?

Yes.

7 Can Docker run Laravel?

Yes.

8 Can Docker run Node.js apps?

Yes.

9 Can Docker run Python apps?

Yes.

10 Is Docker secure?

Yes, if configured properly.

11 Does Docker work on Windows?

Yes.

12 Does Docker work on Mac?

Yes.

13 Is Docker difficult to learn?

No, basics are easy.

14 What is Dockerfile?

Instructions for building images.

15 What is docker-compose?

Tool to manage multi-container apps.

16 What is Docker image?

Template used to create containers.

17 What is Docker container?

Running instance of an image.

18 What is Docker registry?

Storage for images.

19 What is DockerHub?

Public Docker registry.

20 Is Docker used in production?

Yes.

21 What companies use Docker?

Netflix, Amazon, Spotify.

22 Can Docker run microservices?

Yes.

23 What is Kubernetes?

Container orchestration tool.

24 What is Docker Swarm?

Docker's native orchestration.

25 What is bind mount?

Host directory mounted in container.

26 What is Docker volume?

Persistent storage.

27 Can Docker improve deployment?

Yes.

28 Is Docker used in cloud?

Yes.

29 What is CI/CD with Docker?

Automated build and deployment.

30 Is Docker worth learning?

Yes, highly demanded skill.

Final Thoughts

Docker is an essential tool for modern application development, microservices architecture, and DevOps workflows.

By mastering these commands, developers can:

• Deploy applications faster
• Ensure consistent environments
• Simplify dependency management
• Improve scalability and portability

If you're a developer preparing for DevOps interviews or learning containerization, this Docker command cheat sheet will serve as a quick reference.