Devops

General 28 questions

#1
What is DevOps?
#2
What are the benefits of DevOps? What can it help us to achieve?
#3
What are the anti-patterns of DevOps?
#4
How would you describe a successful DevOps engineer or a team?
#5
One of your team members suggests to set a goal of "deploying at least 20 times a day" in regards to CD. What is your take on that?
#6
Explain "Open Source"
#7
Describe the architecture of service/app/project/... you designed and/or implemented
#8
What types of tests are you familiar with?
#9
You need to install periodically a package (unless it's already exists) on different operating systems (Ubuntu, RHEL, ...). How would you do it?
#10
What is Chaos Engineering?
#11
What is "infrastructure as code"? What implementation of IAC are you familiar with?
#12
What benefits does infrastructure-as-code have?
#13
How do you manage build artifacts?
#14
What Continuous Integration solution are you using/prefer and why?
#15
What deployment strategies are you familiar with or have used?
#16
You joined a team where everyone developing one project and the practice is to run tests locally on their workstation and push it to the repository if the tests passed. What is the problem with the process as it is now and how to improve it?
#17
Explain test-driven development (TDD)
#18
Explain agile software development
#19
What do you think about the following sentence?: "Implementing or practicing DevOps leads to more secure software"
#20
Do you know what is a "post-mortem meeting"? What is your opinion on that?
#21
What is a configuration drift? What problems is it causing?
#22
How to deal with a configuration drift?
#23
Explain Declarative and Procedural styles. The technologies you are familiar with (or using) are using procedural or declarative style?
#24
Do you have experience with testing cross-projects changes? (aka cross-dependency)
#25
Have you contributed to an open source project? Tell me about this experience
#26
What is Distributed Tracing?
#27
Containerize an Application
1. Clone an open source project you would like to containerize. A couple of suggestions:
```
https://github.com/bregman-arie/node-hello-world
https://github.com/bregman-arie/flask-hello-world
```
1. Write a Dockerfile you'll use for building an image of the application (you can use any base image you would like)
2. Build an image using the Dockerfile you've just wrote
3. Verify the image exists
4. [Optional] Push the image you've just built to a registry
5. Run the application
6. Verify the app is running
#28
Highly Available "Hello World"
Set up an highly available "Hello World" application with the following instructions:
- Use a containerized Load Balancer
- Provision two virtual machines (this is where the app will run)
- The page, when visited, should show "Hello World! I'm host X" - X should be the name of the virtual machine

Tooling 3 questions

#29
What do you take into consideration when choosing a tool/technology?
#30
Can you describe which tool or platform you chose to use in some of the following areas and how?
- CI/CD
  - Provisioning infrastructure
  - Configuration Management
  - Monitoring & alerting
  - Logging
  - Code review
  - Code coverage
  - Issue Tracking
  - Containers and Containers Orchestration
  - Tests
#31
A team member of yours, suggests to replace the current CI/CD platform used by the organization with a new one. How would you reply?

Version Control 7 questions

#32
What is Version Control?
#33
What is a commit?
#34
What is a merge?
#35
What is a merge conflict?
#36
What best practices are you familiar with regarding version control?
#37
Would you prefer a "configuration->deployment" model or "deployment->configuration"? Why?
#38
Explain mutable vs. immutable infrastructure

Software Distribution 12 questions

#39
Explain "Software Distribution"
#40
Why are there multiple software distributions? What differences they can have?
#41
What is a Software Repository?
#42
What ways are there to distribute software? What are the advantages and disadvantages of each method?
#43
Are you familiar with "The Cathedral and the Bazaar models"? Explain each of the models
#44
What is caching? How does it work? Why is it important?
#45
Explain stateless vs. stateful
#46
What is Reliability? How does it fit DevOps?
#47
What does "Availability" mean? What means are there to track Availability of a service?
#48
Why isn't 100% availability a target? Why do most companies or teams set it to be 99%.X?
#49
Describe the workflow of setting up some type of web server (Apache, IIS, Tomcat, ...)
#50
How does a web server work?

GitOps 15 questions

#51
What is GitOps?
#52
What are some of the advantages of applying GitOps?
#53
When a repository refereed to as "GitOps Repository" what does it means?
#54
What are some practical implementations or practices of GitOp?
#55
Two engineers in your team argue on where to put the configuration and infra related files of a certain application. One of them suggests to put it in the same repo as the application repository and the other one suggests to put to put it in its own separate repository. What's your take on that?
#56
What are the differences between SRE and DevOps?
#57
What SRE team is responsible for?
#58
What is an error budget?
#59
What do you think about the following statement: "100% is the only right availability target for a system"
#60
What are MTTF (mean time to failure) and MTTR (mean time to repair)? What these metrics help us to evaluate?
#61
What is the role of monitoring in SRE?
#62
What are the two main SRE KPIs
#63
What is Toil?
#64
What is a postmortem ?
#65
What is the core value often put forward when talking about postmortem?