Docker Cheatsheet 101
Getting Started with Docker
Docker is a platform for developing, shipping, and running applications inside containers. Containers package software along with dependencies and configurations, enabling consistency across environments.
Basic Commands
- Images
- List images:
docker images - Build an image:
docker build -t <image_name> . - Remove an image:
docker rmi <image_id> - Tag an image:
docker tag <image_id> <repository>/<tag>
- List images:
- Containers
- Create a container:
docker create <image_name> - Run a container:
docker run <image_name> - List running containers:
docker ps - List all containers:
docker ps -a - Start a container:
docker start <container_id> - Stop a container:
docker stop <container_id> - Remove a container:
docker rm <container_id> - Execute command in a container:
docker exec -it <container_id> <command>
- Create a container:
- Networks
- List networks:
docker network ls - Create a network:
docker network create <network_name> - Connect a container to a network:
docker network connect <network_name> <container_id> - Disconnect a container from a network:
docker network disconnect <network_name> <container_id>
- List networks:
Dockerfile Basics
A Dockerfile is a text document that contains all the commands to assemble an image.
Example Dockerfile:
FROM ubuntu:latest
RUN apt-get update && apt-get install -y python3
COPY . /app
WORKDIR /app
CMD ["python3", "app.py"]
Common Instructions:
FROM: Base imageRUN: Execute a commandCOPY: Copy files from host to containerWORKDIR: Set the working directoryCMD: Default command to run
Docker Compose
Docker Compose is a tool for defining and running multi-container Docker applications.
Basic Commands:
- Start services:
docker-compose up - Stop services:
docker-compose down - List services:
docker-compose ps
Example docker-compose.yml:
version: '3'
services:
web:
image: nginx
ports:
- "80:80"
db:
image: postgres
Clean Up
- Remove unused data:
docker system prune - Remove all stopped containers:
docker container prune - Remove all unused images:
docker image prune -a
References
This cheatsheet provides a quick reference to essential Docker commands, helping you manage images, containers, networks, and more. For comprehensive tutorials and examples, visit the Docker documentation and tutorials available online.