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Applicantz Interview Questions and Answers

Updated 3 Sep 2024

Q1. What are the steps to deploy an application to kubernetes?

Ans.

Steps to deploy an application to Kubernetes

  • Create a Kubernetes deployment file with specifications for the application

  • Apply the deployment file using kubectl apply command

  • Monitor the deployment using kubectl get pods command

  • Expose the application using a Kubernetes service

  • Scale the application by adjusting the replica count in the deployment file

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Q2. What is NullResource in terraform.

Ans.

NullResource in Terraform is a resource that performs no actions when applied, but can be used to trigger provisioners or other side effects.

  • NullResource is a resource type in Terraform that allows you to run provisioners without creating any infrastructure.

  • It can be used to trigger actions like running scripts or commands on the local machine or remote servers.

  • NullResource is often used for tasks like running initialization scripts, setting up configurations, or executing cu...read more

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Q3. What are modules in terraform?

Ans.

Modules in Terraform are reusable configurations that can be used to create multiple instances of resources.

  • Modules help in organizing and reusing Terraform configurations.

  • They allow for creating reusable components that can be shared across different projects.

  • Modules can be used to encapsulate related resources and configurations.

  • They promote code reusability and maintainability in Terraform scripts.

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Q4. What is CrashLoopBackOff

Ans.

CrashLoopBackOff is an error state in Kubernetes when a container repeatedly crashes and fails to start.

  • CrashLoopBackOff occurs when a container in a Kubernetes pod crashes and Kubernetes tries to restart it, but it keeps failing.

  • This error is often caused by misconfigurations, resource constraints, or application bugs.

  • To troubleshoot CrashLoopBackOff, check the container logs, resource limits, and pod configuration.

  • Examples: Insufficient memory allocation, incorrect image pa...read more

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Q5. Define stage in docker.

Ans.

A stage in Docker is a logical division in a Dockerfile where a specific set of instructions are executed and the resulting image is saved.

  • Stages help in breaking down complex build processes into smaller, manageable parts.

  • Each stage can have its own base image and set of instructions.

  • Stages can be used to optimize the build process by reusing intermediate images.

  • Stages are defined using the 'FROM' keyword in a Dockerfile.

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Q6. Java 8 What is Lamda Expression What is DI in spring

Ans.

Lambda expression is a concise way to represent an anonymous function in Java 8. DI (Dependency Injection) is a design pattern used in Spring to manage object dependencies.

  • Lambda expressions are used to implement functional interfaces with a single abstract method.

  • DI in Spring allows for loose coupling between objects by injecting dependencies at runtime.

  • Example of Lambda expression: (x, y) -> x + y

  • Example of DI in Spring: @Autowired annotation to inject dependencies

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Q7. modules in terrafrom

Ans.

Modules in Terraform are reusable configurations that can be used to create resources in a consistent and efficient manner.

  • Modules help in organizing and reusing Terraform configurations

  • They can be used to create resources, manage infrastructure, and define policies

  • Modules can be shared and reused across different projects

  • Example: Creating a module for provisioning an AWS EC2 instance

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Q8. What is Functional Interface

Ans.

Functional Interface is an interface with only one abstract method.

  • Functional Interface is used in Lambda expressions.

  • It can have any number of default or static methods.

  • Examples include Runnable, Comparator, and Callable interfaces.

  • Functional Interface can be annotated with @FunctionalInterface annotation.

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Q9. What is oops concept

Ans.

OOPs is a programming paradigm based on the concept of objects, which can contain data and code.

  • OOPs stands for Object-Oriented Programming

  • It focuses on creating objects that interact with each other to solve a problem

  • It includes concepts like inheritance, polymorphism, encapsulation, and abstraction

  • Examples of OOPs languages are Java, C++, Python, and Ruby

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