National Career Service Devops Engineer Interview Questions and Answers

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

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.

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 Dockerf...read more

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.

• Ex...read more

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 initiali...read more

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