Getting started with docker


Docker containers wrap a piece of software in a complete file system that contains everything needed to run: code, runtime, system tools, system libraries and anything that can be installed on a server. This guarantees that the software will always run the same, regardless of its environment.

Run your first docker container

docker run hello-world
  • When you run docker run command
    • Docker engine checks if the image is available or not
    • If image is not available, docker engine will pull from docker registry
    • If image is available, docker engine will run the command locally

docker hello world container

How Docker Works?

  • Docker is the program that enables containers to be built, shipped and run
  • Docker Engine uses Linux Kernel namespaces and control groups

Docker Architecture

Image Reference:


  • Docker Image
    • Read only file with OS, libraries and apps
    • Anyone can create a docker image
    • Images can be stored in Docker hub (default public registry) or private registry
  • Docker Container
    • Stateful instance of an image with a writable layer
    • Contains everything needed to run your application
    • Based on one or more images
  • Docker Registry
    • Repository of images
  • Docker Hub
    • Public docker registry

What is Docker Hub?

  • Docker Hub is the public registry that contains a large number of images available for your use

Docker Hub

  • You can also search through all publicly available images in docker hub
docker search wpscan

docker search command

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