In this offline lecture, Harkirat covers essential Docker concepts, including Docker commands, pushing images to Docker Hub, and using Docker Compose to define and run multi-container applications, providing practical examples and code snippets throughout.

Docker Commands

Docker provides a wide range of commands that allow you to interact with Docker images, containers, networks, and volumes. Here's a brief summary of the most essential Docker commands:

1. docker run:
   • Used to create and start a new container from a Docker image.
   • Example: docker run -p 8080:80 nginx (starts an Nginx container and maps port 8080 on the host to port 80 in the container).
2. docker ps:
   • Lists all running containers.
   • Use docker ps -a to list all containers, including stopped ones.
3. docker images:
   • Lists all locally available Docker images.
4. docker build:
   • Builds a Docker image from a Dockerfile.
   • Example: docker build -t my-image . (builds an image tagged as "my-image" using the Dockerfile in the current directory).
5. docker pull:
   • Downloads a Docker image from a registry (e.g., Docker Hub).
   • Example: docker pull ubuntu (downloads the latest Ubuntu image from Docker Hub).
6. docker push:
   • Pushes a Docker image to a registry.
   • Example: docker push my-image (pushes the "my-image" to the configured registry).
7. docker stop:
   • Stops a running container.
   • Example: docker stop my-container (stops the container named "my-container").
8. docker start:
   • Starts a stopped container.
   • Example: docker start my-container (starts the container named "my-container").
9. docker rm:
   • Removes one or more containers.
   • Example: docker rm my-container (removes the container named "my-container").
10. docker rmi:
    • Removes one or more Docker images.
    • Example: docker rmi my-image (removes the image named "my-image").
11. docker exec:
    • Runs a command inside a running container.
    • Example: docker exec -it my-container bash (starts an interactive Bash shell inside the container named "my-container").
12. docker logs:
    • Retrieves the logs of a container.
    • Example: docker logs my-container (displays the logs of the container named "my-container").
13. docker network:
    • Manages Docker networks.
    • Example: docker network create my-network (creates a new Docker network named "my-network").
14. docker volume:
    • Manages Docker volumes.
    • Example: docker volume create my-volume (creates a new Docker volume named "my-volume").