Docker Interview Question and Answers for experienced and freshers | Docker tutorial | Code Decode

Docker Interview Questions and Answers for Professionals | Docker tutorial | Code Decode

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In this video of code decode, we have explained about docker and interview questions and answers related to docker

What is Docker?
We can imagine Docker as a Cargo Ship that has the ability to
hold big boxes (containers) having their distinct objectives and id.

These containers contain items (application + Dependencies) that are
required to make that container useful and runnable anywhere.

These items are manufactured using templates ( Docker File ).


Docker - Docker is a containerization platform which packages your application and all its dependencies together in the form of containers so as to ensure that your application works seamlessly in any environment, be it development, test or production.

Hence A container contains complete ecosystem of your application

including the application and all of its dependencies, and
everything that is needed for an application to run on the server

This guarantees that the software will always run the same,
regardless of its environment.

What is a container?

A container is a runnable instance of an image. You can create, start, stop, move, or delete a container using the Docker API or CLI.

Containers provide you with a lightweight and platform-independent way of running your applications. Every container is isolated but access to resources on another host or container can be allowed with the help of docker networking.

A container is volatile it means whenever you remove or kill the container then all of its data will be lost from it. If you want to persist the container data use the docker storage concept.

Containers only have access to resources that are defined in the image, unless additional access is defined when building the image into a container

All the docker images become docker containers when they run the on Docker Engine

What are docker images?
Docker-images are a read-only binary template ( Like snapshots ) used to build containers. Images also contain metadata that describe the container’s capabilities and needs.

Create a docker image using the docker build command whenever you pass a Dockerfile to the docker build command then the docker daemon will create a docker image according to the Dockerfile instruction.

Docker images can’t be executed by themselves and cannot run or start. It is just a blueprint for creating Docker containers

Run the docker images using the docker run command. whenever we pass the command to docker client then the docker client passes this command to the docker daemon then docker daemon will create the container for that image.

Push the docker image to the public registry like DockerHub using the docker push command after pushed you can access these images from anywhere using docker pull command

What is a DockerFile?
This text file provides a set of instructions to build a Docker image, including the operating system, languages, environmental variables, file locations, network ports, and any other components it needs to run.

Each time a command is run in a Dockerfile, a new layer is created on top of the previous layers. This allows Docker images to be built incrementally, with each layer representing a separate instruction in the Dockerfile. It also allows Docker to reuse layers between images, which can help reduce the size of images and improve build times.

For example, if you specify a command to install a package in your Dockerfile, a new layer will be created that includes the package and its dependencies. If you make another change, such as adding a file to the image, another layer will be created on top of the previous one

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[vishaldhamde]

Finally you brought the Docker for us. Thank you so much for making this video, this was very much informative. I would request you to please make a live demo and further concepts video on Docker. 😊

[Lipunknb]

Nicely explained. Please post next parts and then the live demo. Thank you for your efforts.

[rakeshpandey]

Waiting for docker video 😃 thankyou, pls also make docker and kubernetes, like how in real projects they are used for deployment and scaling

[aakashsonkusare]

your way of explanation is too good, please add some devops interview videos and real time challenges and troubleshooting videos, thank you.

[CharuAspire]

Thanks for sharing such a quality content. You are helping many of us to shine in our job. Please do upload more on docker, k8s and AWS.

[aakashsonkusare]

Awesome video, thnaks a ton. Please come up with real time issues faced in docker and security of docker too.

[gayathribs]

Nice video. Am new to docker and K8S. Looking forward to learning more from your videos.

[senthilmurugangsm]

Nice video. Thanks a lot for your work which is helping many people's like me. Please create video for docker tutorial instead of interview questions. For kubernetes too. Thank you again.!

[swapnilchavhan]

Hi, Thanks A lot Code Decode, each and every video is rock, Thank you for sharing and please create detail playlist for Docker and Kubernetes

[ramyaganta]

Thank you so much for this wonderful videos, really appreciate your work for helping us to prepare for interviews

[nishantdeep]

Crisp explanation 👌pls create part 2 &3

[mayankjain]

Please make video for all about docker as you mentioned the topics in the end. Thank in advance

[vs]

Hi Mam, thank you very much for docker tutorial, , please please upload the remaining docker contents, thank you again 🙏

[ravid]

Pls do live demo as much soon..it will be very useful. Your contents are top notch

[sandeepchail]

Thanks a lot for your so useful and informative video creation. kindly create the full detailed docker project.

[ankitmishra-dptx]

@CodeDecode This is awersome. Please make a detailed process video wtih Kubernetes and docker and interaction between them,

[sheetalwaghole]

Nice explanation Mam .Can you please post the next part for remaining questions in video @CodeDecode

[chandinishaik]

Nice video..Thank you for your videos which are really helpful..can you please make a whole video for the beginners .

[divyavegoti]

Please make videos on AWS for Java developers if possible and I really appreciate the quality content that you are providing … kudos to you

[ganpatinatrajan]

Great work mam 👍👍👍👌👌👌
Please add K8s also...
Can we get link of ur git repo...