Day 16 Task: Docker for DevOps Engineers

Docker Overview
Docker is a powerful platform that streamlines the process of building, testing, and deploying applications by using containers. Containers encapsulate everything your application needs to run, ensuring consistency across different environments.

Tasks

1. Run a New Container
   To start by running a simple Docker container, use the following command:

    docker run hello-world
   

   This command pulls the hello-world image from Docker Hub (if not already available locally) and runs it. It’s a great way to verify your Docker installation.

2. Inspect Container or Image
   To view detailed information about a specific container or image, use:

    docker inspect <container_id_or_image_name>
   

   Replace <container_id_or_image_name> with the actual ID or name of the container or image you want to inspect.

3. List Port Mappings
   To check the port mappings of a running container, use:

    docker port <container_id>
   

   Replace <container_id> with the ID of your running container.

4. View Resource Usage Statistics
   To monitor resource usage (CPU, memory, etc.) of all running containers, use:

    docker stats
   

   This command gives you a real-time view of resource consumption.

5. View Processes in a Container
   To see what processes are running inside a container, use:

    docker top <container_id>
   

   Replace <container_id> with the ID of the container you want to inspect.

6. Save an Image to a Tar Archive
   To save an image to a tar file for backup or transfer, use:

    docker save -o <output_file>.tar <image_name>
   

   Replace <output_file> with your desired file name and <image_name> with the image you want to save.

7. Load an Image from a Tar Archive
   To load an image from a previously saved tar file, use:

    docker load -i <input_file>.tar
   

   Replace <input_file> with the name of the tar file you want to load.