Day 20 - Docker Cheat Sheet

Docker is a powerful platform that enables developers to create, deploy, and run applications in containers. Whether you're a beginner or looking to enhance your Docker skills, this cheat sheet will guide you through Docker installation, volume management, image handling, and container operations.

Image Management:

1. Pull an Image:docker pull <image_name>This command fetches a Docker image from a registry, such as Docker Hub.
2. List Downloaded Images:docker imagesDisplays a list of locally stored Docker images.
3. Remove an Image:docker rmi <image_name or image_id>Deletes a Docker image from the local machine.

Docker Volumes:

1. Create a Docker Volume:docker volume create <volume_name>Creates a Docker volume.
2. Run a Container with a Volume:docker run -v <volume_name>:<container_directory> <image_name>Attaches a volume to a container, preserving data in the container's directory on the volume.
3. Inspect a Volume:docker volume inspect <volume_name>Provides detailed information about a Docker volume.

Container Lifecycle:

1. Run a Container:docker run <options> <image_name>Starts a new container instance from a Docker image.
2. List Running Containers:bashCopy codedocker psShows a list of currently running containers.
3. List All Containers:docker ps -aDisplays all containers, including stopped ones.
4. Stop a Running Container:docker stop <container_id or container_name>Halts a running container.
5. Remove a Container:docker rm <container_id or container_name>Deletes a stopped container.

Container Interaction:

1. Execute Commands Inside a Container:docker exec -it <container_id or container_name> <command>Allows you to run commands inside a running container.
2. Attach to a Running Container:docker attach <container_id or container_name>Attaches your terminal to a running container.

Docker Compose Commands:

1. Compose Up:docker-compose upBuilds and starts containers based on the docker-compose.yml file.
2. Compose Down:docker-compose downStops and removes containers, networks, and volumes defined in the docker-compose.yml file.
3. Compose Logs:docker-compose logsDisplays log output from services defined in docker-compose.yml.
4. Scale Services:docker-compose scale <service_name>=<num_of_instances>Scales the number of containers for a specific service.

Docker Networking:

1. List Networks:docker network lsShows a list of Docker networks.
2. Inspect a Network:docker network inspect <network_name>Provides detailed information about a Docker network.
3. Create a Network:docker network create <network_name>Creates a new Docker network.

Miscellaneous:

1. Docker Version:docker versionDisplays the Docker version information.
2. Docker Info:docker infoShows system-wide information about Docker.
3. Clean Up Docker Resources:docker system prune -aRemoves stopped containers, unused networks, and dangling images.

Now that you have this comprehensive cheat sheet, you'll be well-equipped to navigate the Docker ecosystem efficiently. Feel free to share this resource with the DevOps community, and remember, continuous learning is the key to mastering Docker! Happy containerizing.