Question 1

What is the difference between Docker image and container?

Accepted Answer

An image is a read-only template containing everything needed to run an application (code, runtime, libraries, etc.). A container is a running instance based on an image. Think of images as classes and containers as objects. You can run multiple containers from a single image.

Question 2

When should I use docker-compose?

Accepted Answer

docker-compose is used when defining and running multi-container applications. For example, when you need to run a web server, database, and cache server together, you can manage all services with a single docker-compose.yml file. It's especially useful for development environment setup.

Question 3

Why do I need Docker volumes?

Accepted Answer

Containers are ephemeral by default. When a container is deleted, its data is lost. Volumes allow you to persist data outside the container. Use volumes for database data, log files, user uploads, and any data that needs to be preserved.

Question 4

How do Docker networks work?

Accepted Answer

Docker networks manage communication between containers. Containers on the same network can communicate with each other by container name. There are various types: default bridge network, host network that shares the host's network, and overlay network that spans multiple hosts.

Command	Description
`docker images`	List images
`docker pull [image]`	Pull an image
`docker build -t [name] .`	Build an image
`docker rmi [image]`	Remove image
`docker image prune`	Remove unused images
`docker tag [image] [new-tag]`	Tag an image
`docker push [image]`	Push an image
`docker save -o [file] [image]`	Save image to file
`docker load -i [file]`	Load image from file

Command	Description
`docker ps`	List running containers
`docker ps -a`	List all containers
`docker run [image]`	Run a container
`docker run -d [image]`	Run in background
`docker run -it [image] bash`	Run interactive
`docker run -p 8080:80 [image]`	Port mapping
`docker run -v /host:/container [image]`	Volume mount
`docker run --name [name] [image]`	Name container
`docker run -e KEY=value [image]`	Set env variable
`docker stop [container]`	Stop container
`docker start [container]`	Start container
`docker restart [container]`	Restart container
`docker rm [container]`	Remove container
`docker rm -f [container]`	Force remove

Command	Description
`docker exec -it [container] bash`	Execute bash in container
`docker exec [container] [command]`	Execute command
`docker logs [container]`	View logs
`docker logs -f [container]`	Follow logs
`docker logs --tail 100 [container]`	Last 100 lines
`docker inspect [container]`	Inspect container
`docker stats`	Resource usage
`docker top [container]`	List processes

Command	Description
`docker network ls`	List networks
`docker network create [name]`	Create network
`docker network rm [name]`	Remove network
`docker network connect [network] [container]`	Connect to network
`docker network disconnect [network] [container]`	Disconnect from network

Command	Description
`docker volume ls`	List volumes
`docker volume create [name]`	Create volume
`docker volume rm [name]`	Remove volume
`docker volume prune`	Remove unused volumes

Docker Cheatsheet

#Images

#Containers

#Exec & Logs

#Network

#Volume

#Docker Compose

#Cleanup

#Frequently Asked Questions

Command	Description
`docker compose up`	Start services
`docker compose up -d`	Start in background
`docker compose down`	Stop and remove
`docker compose ps`	List services
`docker compose logs`	View logs
`docker compose build`	Build services
`docker compose pull`	Pull images
`docker compose exec [service] bash`	Execute in service

Command	Description
`docker system prune`	Remove unused data
`docker system prune -a`	Remove all unused data
`docker container prune`	Remove stopped containers
`docker system df`	Disk usage