Quick reference sheet: Docker

 Here is a detailed quick reference sheet for Docker:

Core concepts

Docker image: A Docker image is a lightweight, standalone, executable package of software that includes everything needed to run an application: code, runtime, system tools, system libraries and settings.

Docker container: A Docker container is a running instance of a Docker image. Containers are isolated from each other and the underlying host system, making them portable and scalable.

Docker registry: A Docker registry is a central repository for Docker images. The most popular Docker registry is Docker Hub.

Useful commands

docker build: Builds a Docker image from a Dockerfile.

docker run: Creates and runs a Docker container from an image.

docker ps: Lists all running Docker containers.

docker stop: Stops a running Docker container.

docker rm: Removes a Docker container.

docker images: Lists all local Docker images.

docker pull: Pulls a Docker image from a registry.

docker push: Pushes a Docker image to a registry.

Example Dockerfile

Dockerfile

FROM nginx:latest

COPY nginx.conf /etc/nginx/conf.d/default.conf

EXPOSE 80

This Dockerfile will build a Docker image that contains the nginx web server. The COPY instruction copies the nginx.conf configuration file to the container. The EXPOSE instruction exposes port 80 on the container, which is the port that nginx uses to listen for web traffic.

Tips and tricks

Use Docker Compose to manage multiple Docker containers as a single application.

Use Docker volumes to share data between Docker containers and the host system.

Use Docker networks to connect Docker containers to each other and to external networks.

Use Docker labels to organize and manage Docker containers.

Use Docker images to build and deploy your applications in a consistent and repeatable way.

Additional Reference sheet items

Docker networking: Docker provides a variety of networking options for Docker containers, including bridge networks, overlay networks, and host networks.

Docker security: Docker provides a number of security features, such as isolation, content trust, and network security.

Docker troubleshooting: There are a number of tools and resources available to help you troubleshoot Docker problems.

For more information on Docker, please see the official Docker documentation: https://docs.docker.com/

Additional tips for using Docker:

• Use a Dockerfile to build your images. This will make it easier to reproduce your images and deploy them to different environments.

• Use Docker Compose to manage your applications. This will make it easier to start, stop, and manage multiple containers as a single unit.

• Use Docker volumes to share data between containers and the host system. This will make it easier to persist data and make it available to multiple containers.

• Use Docker networks to connect containers to each other and to external networks. This will make it easier to communicate between containers and to access the internet.

• Use Docker labels to organize and manage your containers. This can make it easier to find and manage specific containers.

• Use Docker images to build and deploy your applications in a consistent and repeatable way. This can help you to save time and reduce errors.