Apexon-interview Question

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lInterviewers asked several AWS-related questions focusing on EC2 management, S3 recovery, networking, and databases. �How to restore access to an EC2 instance after losing the PEM key? �How to optimize cost and performance for an EC2 application with traffic spikes during business hours? �Steps to identify and restore service if an EC2 instance crashes unexpectedly? �Explanation of EC2 instance status checks? �Possible issues preventing an EC2 app from fetching images from the internet? �Way to recover accidentally deleted data from an S3 bucket? �Methods to connect on-premise data center to AWS? �How to enable communication between apps in two different VPCs? �Possible problems when an EC2 app fetches product icons from S3? �Types of databases used in AWS and how to configure RDS for high availability? �Kubernetes QuestionsQuestions covered Kubernetes architecture, upgrades, pod distribution, services, and probes. �Brief explanation of Kubernetes architecture? �How to upgrade a Kubernetes cluster? �How to distribute 10 pods equally over 10 nodes for log collection? �What is a DaemonSet? �Setup to access an EKS pod application via DNS like www.abc.com? �Different types of services in Kubernetes? �Use of persistent volumes in Kubernetes? �Different types of probe checks? �What is a sidecar container? �Terraform, CI/CD, Docker, Linux, and Other QuestionsAdditional questions spanned IaC, pipelines, container optimization, scripting, and tools. �Approaches to create 10 identical EC2 instances using Terraform? �How to pass a manually created VPC ID to Terraform for EC2 provisioning? �Behavior of Terraform apply if a provisioned VPC is manually deleted? �How to pass VPC ID from one Terraform module to an EC2 module? �CI/CD tools familiar with and stages in Jenkins pipeline? �How to distribute load on Jenkins? �Tools to scan Docker images and repositories for storing them? �How to optimize a Dockerfile? �Command to clear unused Docker images? �Troubleshooting permission error when running a script on Linux? �Debugging slow performance on a Linux server? �How to take arguments in a bash script and meaning of $? �Familiarity with Helm or Argo CD configurations? �Monitoring tools used? �