AWS Interview Questions and Answers

In AWS, the lifecycle hook is a feature included in the auto scaling which helps to control instance launch and termination state within the auto scaling group. It remains in a waiting mode for a certain amount of time when the instance is paused. We can create lifecycle hooks by using the command

put-lifecycle-hook. Lifecycle hooks are also customizable with various actions such as by defining a target notification for the lifecycle hook, creating an instance running script as the instance starts or determining a CloudWatch Event target to invoke functions associated with the Lambda when the lifecycle action occurs.

AWS Lambda is an advance compute service that lets users run code without managing or provisioning servers. Users can also build here serverless applications which are composed of functions and triggered by events and automatically deployed using AWS CodeBuild and CodePipeline. The AWS Lambda is used to:

• Build on-demand and smaller applications which are responsive to events and new information.
• Support native Linux executables operate securely by calling them out from a supported runtime.
• Execute code in response to triggers.
• Real time file and stream processing.
• Perform data sorting, filtering, validation and other changes for data in a DynamoDB table and then load them to another data store.

Amazon CloudFront is an advanced content delivery network offered by AWS which provide a globally-distributed network of proxy servers that cache content such as web videos and another type of big media, locally to consumers. This exceptionally improves the access speed for downloading the content for users.

In AWS, the load balancer improves responsiveness and exceptionally increases the availability of applications. It sits between server firm and client accepting application traffic, incoming network and distributing that traffic across multiple backend servers with the help of various methods. It agrees with the client’s incoming traffic and routes requests to the registered targets in availability zones. The load balancer also reviews the health of registered marks and makes sure that the traffic should only be routed to useful destinations.

Follow the below mentioned steps to create a classic load balancer:

• Select a load balancer type
• Define that load balancer
• Now assign security groups to that load balancer in VPC
• Then configure health checks for EC2 instances
• Continue with a registeringEC2 instance with a load balancer
• Tag the load balancer
• Now create and verify that load balancer to finish the proces

Amazon RDS or Amazon Relational Database Service is a web-based service which helps users for cloud-based relational database setup, operation, and scale. It offers excellent resizable capacity and cost efficient for a relational database which is industry stranded and also manages common database administration tasks.