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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[@vishaldhamde2013]

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. 😊

[@CodeDecode]

Sure Vishal 🙂👍

[@aakashsonkusare69]

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

[@Lipunknb]

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

[@CodeDecode]

Sure pratyush we will create live demo soon

[@ramyaganta3567]

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

[@CodeDecode]

Thanks for the nice words

[@aakashsonkusare69]

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

[@CodeDecode]

👍👍sure

[@swapnilchavhan480]

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

[@CodeDecode]

Sure Swapnil 🙂👍 thanks a ton . Glad to be helpful

[@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.!

[@CodeDecode]

Sure Senthil 👍👍

[@vs7035]

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

[@CodeDecode]

Sure 😊👍

[@mayankjain2979]

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

[@CodeDecode]

th-cam.com/video/DwWkjEwsI4Q/w-d-xo.html

[@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.

[@CodeDecode]

Sure Charu. Here you goth-cam.com/video/DwWkjEwsI4Q/w-d-xo.html

[@sheetalwaghole3065]

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

[@Viki-v4p]

Mam , if the openjdk:17-alpine is linux based image , then which images now we can use for current scenarios like jdk 21 , 22 which support all over the network.
And can you teach us like if there is a multiple application.yml for different purpose like dev , test , qa how can we configure it for docker.and before that how can we encrypt those application.yml credentials like mysql host , user , password , aws credentials , jwt keys..

[@sandeepchail839]

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

[@CodeDecode]

Sure 👍👍

[@gayathribs5309]

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

[@CodeDecode]

Sure Gayathri . This series we will start from scratch only and will take till advance level

[@rakeshpandey6947]

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

[@CodeDecode]

Sure Rakesh 👍

[@A.Sandeep-18]

So in entry point we will input the application code we have in our host webserver, so that when docker starts the code will be present in it , is my understanding right ?

[@ankitmishra-dp9tx]

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

[@Parvathi-n8r]

Hi, Can you please make one video with the combination of Docker, Kubernetes ,microservices and mongodb.

[@chandinishaik3700]

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

[@CodeDecode]

Yeah Chandini . We have started this series from scratch only covering like - what is docker

[@nishantdeep3973]

Crisp explanation 👌pls create part 2 &3

[@CodeDecode]

Thanks Nishant . Sure 👍👍

[@ganpatinatrajan5890]

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

[@CodeDecode]

Sure 👍. We will cover this project in live demo

[@vs7035]

Please add kubernetes as well

[@CodeDecode]

Sure sure👍👍

[@VaishnavisFoodFinds]

Please upload videos of kubernates and azure also.
Thanks !

[@CodeDecode]

Sure we will upload it soon

[@ravid2727]

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

[@CodeDecode]

Sure we will create more such videos

[@ruchibhagwat1580]

@@CodeDecode please share the live demo video.Thank you for this video.Very helpful!!!

[@punamsingh7380]

Hi ..This video is really helpful . But can u please make a video in .net core to understand better.

[@lakshmipriyaalagiyamanaval3059]

Good explanation! Please post the part 2 and part 3 videos

[@CodeDecode]

Sure 😊👍. We have uploaded part 2

[@divyavegoti4609]

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

[@CodeDecode]

www.udemy.com/course/master-spring-boot-microservice-angular-with-k8s-cicd-aws/

[@rakeshpal8730]

Please create a whole end to end docker project. Thanks.

[@CodeDecode]

Sure Rakesh 👍

[@basanthish]

Yes we need more on docker

[@CodeDecode]

Sure Basanth 👍

[@kshivani4943]

Thanks a lot CodeDecode!

[@CodeDecode]

❤️❤️

[@soodmanu78]

Please provide an example with windows for docker

[@CodeDecode]

Here you go
th-cam.com/video/DwWkjEwsI4Q/w-d-xo.html

[@calljsaran]

Outstanding Work!!!Kudos!

[@CodeDecode]

Thanks

[@saialekhyavadali807]

Please make more videos on docker, kubernates

[@CodeDecode]

Sure Alekhya 👍👍

[@paridadeepika]

Very informative

[@CodeDecode]

Thanks

[@kinjal656]

Please provide more videos on docker

[@CodeDecode]

Sure kinjal videos are lined up we will create it soon

[@manojpal1496]

Superb !!!

[@CodeDecode]

Thanks

[@maheshkumarnaik754]

Plz continue with theory .

[@CodeDecode]

Sure we will create more soon

[@seshumantra6344]

Hi mam, please do videos on remaining concepts as well

[@CodeDecode]

Sure 😊

[@sayanbiswas8847]

Much needed. Thanks a lot

[@CodeDecode]

Thanks Sayan 😊👍

[@jsvignesh7009]

Hi Mam Huge shoutout for you😊Thanks a lot. Can you pls upload docker and k8 for microservices projects. Will be more helpful. Thanks in advance

[@CodeDecode]

Thanks. Sure we will👍👍

[@fattyacid88]

Like the content

[@CodeDecode]

Thanks 😊👍

[@kmmalviya]

Nice and informative video but there are alot of concepts and live demo pending, I am requesting you to please complete this series along with K8S. In interview people are expecting alot more than this, so please make few more videos to complete this series.

[@CodeDecode]

Yeah Krishna this is just the start of the series . We will next take live demo and then will continue with architecture and other advance questions

[@kmmalviya]

@@CodeDecode I am giving interview on these skills, interviewers are asking questions on exact steps on creating images/containers step by step and deploying them using K8S, troubleshooting containers, docker volumes & registery, docker networking, how to make communications between docker with orchestration tool like K8S. Also some scenario based questions will be really helpful. Thank you so much.

[@CodeDecode]

Thanks a ton Krishna for awesome real time questions. We will surely make videos on implementation and advance concepts. It's just a start of this playlist. But we will make sure these questions are covered in upcoming videos

[@consistentlearners]

Please a live demonstration and then followed by the theory.

[@CodeDecode]

th-cam.com/video/DwWkjEwsI4Q/w-d-xo.html

[@sandeepchail839]

live demo then rest of the theory part plz

[@CodeDecode]

Sure thanks Sandeep 🙂👍

[@Ss_Sl]

Please do a live demo

[@CodeDecode]

Sure 😊👍👍

[@anandahirkar2207]

pls k8c related video o

[@CodeDecode]

Sure 👍

[@arjunvetal2274]

create from scratch and also how to docker springboot+react+mysql all of the

[@CodeDecode]

Sure Arjun 👍

[@sproutboot]

100th 👍

[@CodeDecode]

Thanks 😊😊