DevOps Classroom notes 29/Nov/2025

Docker components

• When we install docker we get the following components
  • docker client
  • docker daemon
  • local storage
    
• client => command line application
• Docker can be installed on
  • windows
  • linux
  • mac

Play with docker

• We will use a docker playground
• To use it we need a docker hub account
• We get a linux machine with docker pre-installed.

Getting used to cli

• docker info:
  • client
  • server
• To run a container we need a image.
• Docker hub is a registry. Registry is collection of Repositories, Where each repository refers to an image (application/os)
• To manage versions image has tags
• Docker hub naming conventions:
  • official images: <image-name>:<tag>
  • other images: <account>/<image-name>:<tag>
• If the tag is not provided docker will use a default
• To run a container we need to have image locally
• To check the images locally command is

docker images
docker image ls

• I want to run nginx in container, so we need to pull the image
  
• CLI Commands cheatsheat
• Prompt 1:

Act as a terminal with docker installed, when i type any docker command explain what it does, why and where it is used and give me some examples 

• Prompt 2

Act as a docker expert, I will give you the situation or scenario which i want to acheive using docker, Give me which cli to use and expand on explanations and examples

• What are the containers that are running
• what are the containers that are stopped
• Remove the container
• Exercise:
  • run the tomcat container