10+ Bharat Petroleum Interview Questions and Answers

The two health checks when an EC2 instance is launched are System Status Checks and Instance Status Checks.

• System Status Checks ensure that the underlying host system is healthy and reachable.

• Instance Status Checks ensure that the instance is running properly and can be accessed.

• Examples: System Status Checks may include checking network connectivity, while Instance Status Checks may include verifying system logs.

IAM groups are collections of IAM users, while IAM roles are permissions that can be assumed by users or services.

• IAM groups are used to manage permissions for multiple users at once

• IAM roles are used to delegate permissions to users or services

• IAM groups can contain multiple users, while IAM roles can only be assumed by one entity at a time

Terraform, Packer, and Puppet are tools used in DevOps for infrastructure automation and configuration management.

• Terraform is used for infrastructure as code and automates the provisioning of infrastructure resources.

• Packer is used for creating machine images for multiple platforms from a single source configuration.

• Puppet is used for configuration management and automates the deployment and management of software and configurations across multiple servers.

Scripted and declarative pipelines in Jenkins for DevOps Engineer role

• Scripted pipeline uses Groovy script syntax

• Declarative pipeline uses a more structured format with predefined stages

• Scripted pipeline example: node { stage('Build') { echo 'Building' } }

• Declarative pipeline example: pipeline { agent any stages { stage('Build') { steps { echo 'Building' } } } }

VPC stands for Virtual Private Cloud, a virtual network dedicated to your AWS account.

• VPC allows you to create a logically isolated section of the AWS Cloud where you can launch AWS resources.

• You can define your own IP address range, create subnets, configure route tables, and network gateways within a VPC.

• VPC provides security by allowing you to control inbound and outbound traffic to and from your instances.

• You can connect your VPC to your corporate data center using an IPs...read more

Kubernetes architecture is a container orchestration platform that manages containerized applications across a cluster of nodes.

• Kubernetes follows a master-slave architecture with a master node and multiple worker nodes.

• Master node components include API server, scheduler, controller manager, and etcd.

• Worker node components include kubelet, kube-proxy, and container runtime (e.g. Docker).

• Nodes communicate with each other using the Kubernetes API.

• Kubernetes uses Pods as the sm...read more

OOPs in Java stands for Object-Oriented Programming concepts which include inheritance, encapsulation, polymorphism, and abstraction.

• OOPs concepts help in organizing and structuring code for better reusability and maintainability.

• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation hides the internal state of an object and only exposes necessary functionalities.

• Polymorphism allows objects to be treated as instances of their parent cla...read more

A linked list is a data structure consisting of a sequence of elements where each element points to the next element in the sequence.

• Consists of nodes where each node contains data and a reference to the next node

• Can be singly linked (each node points to the next node) or doubly linked (each node points to both the next and previous nodes)

• Common operations include insertion, deletion, and traversal

• Example: Singly linked list: 1 -> 2 -> 3 -> 4

• Example: Doubly linked list: 1 <->...read more

Writing a terraform script for infrastructure provisioning

• Define provider and required variables

• Create resources like instances, networks, and storage

• Use modules for reusable code

• Implement variables and outputs for flexibility

• Leverage terraform state for tracking changes