DevOps interview questions - Basic Concepts, Microservices, Databases, AWS

What is VPC

What is reverse and forward proxy server

What is VPN, how to setup vpn

How to setup password less SSH

How to setup vpc peering

What is SSH tunnel, how to setup one

How to restrict development environment for a website to company employees only

What is CI/CD and how to setup CI/CD for a microservice.

SSL certificates, LetsEncrypt

DNS concepts - Route 53, AAA record, TXT record, MX record

What is an API Gateway

Infrastructure as code

How to secure secrets for any production environment? Different patterns for the same?

How to setup cluster of Cassandra

How to setup replication for mysql database

How to setup mongodb cluster

How to take db backup for mysql. Incremental and absolute

how to take db backup for Cassandra. Incremental and absolute

How to take db backup for mongodb. Incremental and absolute

How to setup Kafka

What is microservices architecture? What kind of complexity microservices brings from DevOps perspective.

How to monitor microservices logs? What kind of tooling is available for application logging & monitoring

What is centralized logging?

What is containerization? Basic concepts of Docker and Kubernetes?

What are different AWS services you are aware of.

CodeDeploy

EC2 instances

How to create a jenkins slave on the fly using aws spot instances and discard it once job is done.

How to launch an EC2 machine on the fly using lambda

How to configure auto-scaling for EC2 instances?

How to setup a microservice in production using auto-scaling?

What is ECS? What is difference between EC2 based and fargate approach for ECS?

How to setup a code deploy pipeline using Jenkins/Bitbucket and AWS

How to monitor cloudwatch alarms using lambda triggers?

How to write a simple AWS lambda function using python/nodejs?

API Gateway - how to setup CORS headers? How to monitor API gateway? proxy requests? how to expose a lambda function through API Gateway?

Cloudformation concepts

SQS and S3, glacier

What is cloudfront, how to host static website/angular app using cloudfront

DynamoDB

How to monitor machines? Nagious, promethous

How to monitor application logs?

Jenkins - pipelines, secret key management, dependent jobs, etc.

What is ELK and how to setup ELK?

Graylog

API Umbrella - API Gateway concepts

Slack integration for various applications

How to monitor production environment? What are tools available for the same?

How to use cloudwatch alerts to trigger email/SMS custom integration for a production incidence?

How to implement health check for a service

How to handle security - OWSAP familiarity

How to limit access of certain environments to specific group of people

How to manage production secrets

Introduction to Ansible scripts