DevOps Interview Preparation Useful real time tips | Crack DevOps Interviews | How to clear DevOps Interviews

Are you failing in DevOps Interviews? Are you not be able to go to next round in the Interview process? 

First of all you need to have clear story about following five key items:

#1.     Come up with a story to talk about your back ground and over all experience 

            What are the Devops tools you have worked in, what cloud platform you are familiar ?

#2.     Have clear idea to talk about your role in your current project

           Your role instead of what whole team did

#3.     Your day to day responsibilities as a DevOps engineer

           How you spend your day 9-5. Starting with stand up, cicd, infra automation, collaborate with teams, meetings and documentation.

#4.     Be ready to talk about the challenges, how you overcome them in your current project

           What challenges you had, how did you over-come and what was the outcome?

#5.     Be clear about what you know and what you don’t know.            

• It is OK to say you don’t know or have not worked that specific tool when asked about it. Show some willingness to learn
• For e.g you may be good in CICD but not good in,  let’s say in container orchestration tools such as Kubernetes, which is OK.

Docker Interview Questions - Popular Docker Interview Questions

Docker Interview Questions - Popular Docker Interview Questions

1. What is the difference between Docker image and Docker container?

Docker container is simply an instance of Docker image.
A Docker image is an immutable file, which is a snapshot of container. We create an image with build command. Docker image contains all your application code along with all the dependencies packaged into this snapshot.

When we use run command, an Image will produce a container.

In programming language, an Image is a Class and a Container is an instance of the class.

2.  Can we run multiple apps on one server with Docker?
Yes, theoretically we can run multiple apps on one Docker server. But in practice, it is better to run different components on separate containers.

With this we get cleaner environment and it can be used for multiple uses.

3. How does docker client communicates with Docker daemon?

Docker client or command line interface, communicated with Docker daemon through APIs. 

    4.     How to enable IPV6 in Docker

Edit /etc/docker/daemon.json and set the ipv6 key to true.

{

  "ipv6": true

}

Save the file.

Reload the Docker configuration file by executing the below command:

systemctl reload docker

   5. How to copy files inside Dockerfile?

     Use COPY command

     For e.g.,

COPY app.py /usr/src/app/

6. How do you see running container in Docker?
docker ps command

7. How do you see all the containers?

docker ps -a command will show all the containers..

8. How to create directory inside Dockerfile?

mkdir -p /var/www/app

or  

WORKDIR /var/www/app 

      9. What are the benefits of using Docker?
      Docker is a very powerful tool. Some of the main benefits of using Docker are as follows:
     
       I. Utilize Developer Skills : With Docker we maximize the use of Developer skills. With Docker  there is less need of build or
release engineers. Same Developer can create software and wrap it in one single file.
       II. Standard Application Image : Docker based system allows us to bundle the application software and Operating system files in a
single Application Image that can be deployed independently.

       III. Uniform deployment : With Docker we can create one package of our software and deploy it on different platforms seamlessl y
   
10. What happens when you stop the container? Will you loose the data?
You won’t lose any data when Docker container exits. Any data that your application writes to the container gets preserved on the disk until you explicitly delete the container. The file system for the container persists even after the container halts.

11. What is the difference between Docker stop and Docker kill commands?
The difference between ‘docker kill’ and ‘docker stop’ is that ‘docker stop’ gives the container time to shutdown gracefully, in situations when it is taking too much time for getting the container to stop, one can opt to kill it.

Questions to ask after you are done with DevOps interview | What questions to ask after you are done with DevOps interview

Questions to ask after you giving Devops interview:

1. Where are you in DevOps transformation in your company? What level of maturity team is currently at?
2. What kind of DevOps tools are you using?

3. Where does security fit in your CICD pipelines today?
4. What level of automation is currently in place in the team?
5. What would be my day to day activities, if I am selected?
6. How do development team interact with platform or devops team? 
7. Are you completely migrating to cloud such as AWS or Azure or on-prem also?

8. Is there anything you wish this role could fix immediately?  

Popular DevOps Interview Questions - Top DevOps Interview Questions - Part 3

Let us see some popular but basic DevOps Interview Questions:

1. How will you integrate Jenkins and SonarQube? Walk through steps of Jenkins SonarQube integration
2. Whats the pipeline code for integrating with SonarQube from jenkins?
3. Walk through steps of making a code changes locally and pushing into GitHub or Bitbucket.
4. What is the difference between git clone and git pull?
5. What are the advantages of containers? why we need them?
6. How will you resolve merge conflicts in Git?
7. What is the difference between Ansible and Puppet ? when will you use on tool over other?
8. What is the difference between Ant and Maven? Why maven is better than Ant?


Click here for part 1 DevOps Interview Questions.
Click here for part 2 DevOps Interview Questions.

DevOps Interview questions - Top DevOps Interview questions - Latest DevOps Interview Questions - Part 2

Please find more DevOps interview questions..

1. What is Test Driven Development? How will you implement TDD?
2. What is the difference between Agile and DevOps?
3. What are the tools you integrated in pipeline you build?
4. What are the different plug-ins you used in Jenkins?
5. What is microservices? How will you create microservices?
6. How will you dockerize an application? What are the steps?
7. Have you configured webhooks in ? How will you do it?
8. What is Jenkinsfile?
9. What are the DevOps tools you have used?
10. Why Git is distributed version control system?
11. How will you set up communication between two systems without password but secure way?
12. What do you understand by “Infrastructure as code”? 

DevOps Interview Questions - Part I - Basic DevOps Interview Questions

Please find DevOps Interview questions asked during the interview:

They are simple but we should be able to answer them convincingly.

1. Tell us about yourself..
2. Tell us about your Devops role in your existing project.
3. What is Devops about your perspective ?
4. What are the challenges you faced from DevOps perspective?
5. What is the team size?
6. What are your day to day activities?
7. How do you troubleshoot in case of any errors?
8. Tell me about your Devops tools experience or what are the Devops tools you worked on?
9. Walk us through stages of pipeline you created in Jenkins.
10. What was the difficult challenge you faced and how did you overcome?
11. What is the difference between Git and any other version control systems?
12. What is the difference between Continuous Delivery and Continuous Deployment?