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Docker – From Scratch To App (DevOps) – Part-1


  • Docker is a platform where we can develop our application as a separate environment.
  • We can run, deploy and manage our application inside a docker.
  • We can create our application irrespective of the infrastructure of our system so that is a big advantage of using docker.
  • Having our application independent of the infrastructure helps in the faster development of the software.
  • Docker helps in faster delivery as no time is wasted around managing the correct versions of the packages.
  • Testing is also done in docker.
  • Overall we can conclude that docker act as a separate machine common to everyone that increases productivity and helps more in focusing on the code.
  • Docker is written in Go Programming Language (the backend of Docker).


Hello World! in Docker

  • Let’s get our hands dirty with docker.
  • After installation, let’s check whether it is installed correctly or not.
  • So for that let’s run the following command on our terminal.
docker --version
  • Currently, I am using 20.10.7, so we can see that docker is installed successfully for me.
  • This is how the UI of the Docker desktop looks like.
  • Now we have everything set up, so let’s first understand certain things about docker.
  • Container – A container is a lightweight isolated environment where we can package and run our application.
  • Many Container can be run simultaneously.
  • Most of the times applications are deployed as a container.
  • Image – Docker Images are the read-only instructions that are used for creating a container.
  • One Image can inherit another image, likewise, multilevel hierarchy is supported.
  • Hello-World image is already present in docker, so to access it, let’s run the below code.
docker run hello-world
  • Here we can see that the image was not present on our local system, so it downloaded/pulled the image for us and has shown the Hello from Docker !, message.
  • We are now done with the Hello World! , let’s move to some more stuff.

Common Commands used in Docker

  • To see the images on your local system –
docker images
  • In the output, we can see all the images are present in our local system.
  • Docker images command work same as –
docker image -ls
  • Both of them present the same output.
  • Whenever we run an image we are creating a container, so the docker run command creates a container.
  • We can run the images/containers with a different name also, for that –
docker run --name DemoName hello-world
  • Here we can see that the container ran successfully.
  • To see all the images that you have run-
docker ps -a
  • Here we can the name of the image, container id container name as well as status and their creation time with ports.
  • Similarly to see the last ran container, we can use-
docker ps -a -l
  • To delete a docker image-
docker rmi -f imageName
  • Here we can see in the output that we have successfully deleted hello-world image.
  • We can use docker rm to delete a stopped container.
  • To see all the currently running containers
docker container ls
  • To stop a container we can use-
docker stop containerId
  • To forcefully stop a container we can use docker kill instead of docker stop.
docker kill containerId
  • To login into someone’s organization hub or docker page
docker login

Conclusion –

  • That’s it from the first part.
  • In the next part, we will learn how to create an image and what are the different tags that are used with an image.


Still Curious? Visit my website to know more!

For more interesting Blogs Visit- Utkarsh Shukla Author

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