Docker has revolutionized the way we develop and deploy applications. This cheat sheet provides a clear overview of essential Docker commands, examples, and installation guidance for different operating systems. Get ready to unlock the power of containerization!
Building Images:
- Build an Image:
docker build -t <image_name> .– Builds an image from your current directory’s Dockerfile. - Cacheless Build:
docker build -t <image_name> . --no-cache– Ignores cache and rebuilds from scratch.
Image Management:
- List Images:
docker images– Displays all local images. - Delete Image:
docker rmi <image_name>– Removes the specified image. - Clean Up:
docker image prune– Removes unused images locally. - Login to Docker Hub:
docker login -u <username>– Provides access to public/private repositories. - Publish Image:
docker push <username>/<image_name>– Uploads your image to Docker Hub. - Search Docker Hub:
docker search <image_name>– Finds images publicly available. - Pull Image:
docker pull <image_name>– Downloads an image from Docker Hub to your local system.
Container Operations:
- Run a Container:
docker run --name <container_name> <image_name>– Creates and runs a container with a custom name. - Port Mapping:
docker run -p <host_port>:<container_port> <image_name>– Exposes a container port to the host machine. - Background Mode:
docker run -d <image_name>– Runs the container in the background. - Start/Stop:
docker start|stop <container_name>– Manages existing containers. - Remove:
docker rm <container_name>– Deletes a stopped container. - Shell Access:
docker exec -it <container_name> sh– Opens a terminal inside a running container. - View Logs:
docker logs -f <container_name>– Shows real-time log output of a container. - Inspect:
docker inspect <container_name>– Details information about a running container. - List Containers:
docker ps– Displays currently running containers. - All Containers:
docker ps --all– Shows running and stopped containers. - Resource Usage:
docker container stats– Monitors resource usage of running containers.
Examples:
1. Running a simple web server:
docker run -p 80:80 nginx:latest
This starts an Nginx web server container, mapped to host port 80, serving content from the default Nginx document root.
2. Building a custom Node.js app:
- Create a Dockerfile with instructions.
- Use
docker buildto build an image from the Dockerfile. - Run the image with
docker runto start your application.
Docker Installation:
– Windows: Download and install Docker Desktop from https://docs.docker.com/desktop/install/windows-install/
– macOS: Install Docker Desktop from https://docs.docker.com/desktop/install/mac-install/
– Linux: Use your distribution’s package manager or follow instructions at https://docs.docker.com/engine/install/
Further Exploration:
- Docker Documentation: https://docs.docker.com
- Docker Hub: https://hub.docker.com
- Awesome Compose: https://github.com/docker/awesome-compose
Remember, this cheat sheet provides a starting point. Experiment with Docker commands and explore its vast potential!
Love This !! my thoughts on this ….
Thanks – PomKing
http://www.pomeranianpuppies.uk