Coditas Technologies Devops Engineer Interview Questions and Answers for Experienced

Round duration - 60 minutes
Round difficulty - Easy

Technical interview round with questions on Jenkins, Kubernetes, MYSQL etc.

Q1. What are the differences between declarative and scripted pipelines in Jenkins?
Ans. 
Declarative pipelines focus on the desired state of the pipeline, while scripted pipelines allow for more flexibility and control.
• Declarative pipelines use a more structured syntax and are recommended for simpler pipelines.

• Scripted pipelines use Groovy script and allow for more complex logic and customization.

• Declarative pipelines are easier to read and maintain, while scripted pipelines can be more powerful but harder...read more
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Q2. How does Jenkins know when to execute a scheduled job or pipeline, and how is it triggered?
Ans. 
Jenkins triggers scheduled jobs or pipelines based on configured cron expressions or triggers from external events.
• Jenkins uses cron expressions to schedule jobs at specific times or intervals.

• Jobs can also be triggered manually or by external events like code commits to a repository.

• Pipeline jobs can be triggered by changes in a Git repository, webhook notifications, or other external triggers.
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Q3. What are the differences between Ansible and Jenkins?
Ans. 
Ansible is a configuration management tool, while Jenkins is a continuous integration and continuous deployment tool.
• Ansible is used for configuration management and automation of tasks, while Jenkins is used for automating the build, test, and deployment processes.

• Ansible uses YAML for configuration management, while Jenkins uses Groovy scripts for defining build pipelines.

• Ansible is agentless, meaning it does not req...read more
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Q4. What is the difference between Kubernetes Deployments and Pods?
Ans. 
Kubernetes Deployments manage multiple Pods and provide features like scaling, rolling updates, and rollback.
• Deployments manage the lifecycle of Pods, ensuring a desired state is maintained.

• Pods are the smallest deployable units in Kubernetes, representing a single instance of a running process.

• Deployments allow for easy scaling of applications by creating or deleting Pods based on the defined configuration.

• Deployments...read more
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Q5. What are the differences between Ingress and Load Balancer in Kubernetes?
Ans. 
Ingress is a layer 7 HTTP routing mechanism while Load Balancer is a layer 4 TCP/UDP load balancer in Kubernetes.
• Ingress is used to expose HTTP and HTTPS routes to services inside the cluster, while Load Balancer is used to distribute traffic across multiple nodes.

• Ingress provides features like SSL termination, path-based routing, and name-based virtual hosting, while Load Balancer focuses on distributing traffic based...read more
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Round duration - 60 minutes
Round difficulty - Easy

Technical round with questions on AWS Services, Docker, Microservices etc.

Q1. What are the differences between Amazon ECS and Amazon EKS?
Ans. 
Amazon ECS is a container management service while Amazon EKS is a managed Kubernetes service.
• Amazon ECS is a fully managed container orchestration service, while Amazon EKS is a managed Kubernetes service.

• Amazon ECS is more tightly integrated with other AWS services like CloudWatch, IAM, and VPC, while Amazon EKS is more flexible and can run on any cloud provider.

• Amazon ECS uses its own proprietary orchestration engin...read more
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Q2. What are the use cases of running Docker inside Docker?
Ans. 
Running Docker inside Docker is useful for testing, CI/CD pipelines, and isolating environments.
• Testing different Docker configurations

• Running CI/CD pipelines within containers

• Isolating development environments

• Building and testing Docker images within containers
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Q3. What is the difference between monolithic and microservices architecture?
Ans. 
Monolithic architecture is a single, unified system while microservices architecture is a collection of small, independent services.
• Monolithic architecture is a single, indivisible unit where all components are tightly coupled.

• Microservices architecture breaks down the application into smaller, loosely coupled services that communicate through APIs.

• Monolithic architecture can be harder to scale and maintain compared to...read more
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