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Server - Interview Questions and Answers for 'Server' - 56 question(s) found - Order By Rating

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 Q1. What is the difference between closing and completing the observer / listener ?Angular
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   Like         Discuss         Correct / Improve     observer   listener


 Q2. How to debug multi server deployed application ?Debugging
Ans. Choose the server from the list of defined servers under J2EE Server.
Choose the project to debug.
Click Apply to save changes.
Click Debug to start the server and run the application.

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 Q3. Which category of services, Amazon Lambda belongs to ? Amazon Web Services (AWS)
Ans. It's Serverless and PAAS ( Platform as a service )

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   Like         Discuss         Correct / Improve     paas  serverless


 Q4. What is the default port for smpt server ?Server
Ans. 25,465 and 587

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 Q5. Difference between Tomcat and IBM Websphere.Server
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 Q6. How would you handle clustering on multiple servers? Server
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   Like         Discuss         Correct / Improve     production support     Asked in 1 Companies


 Q7. What are the distributed caches ?Server
 This question was recently asked at 'RiseSmart India'.This question is still unanswered. Can you please provide an answer.


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 Q8. How can we take snapshots and track changes to environment variables in Elastic Beanstalk or Lambda ? Amazon Web Services (AWS)
Ans. We can use AWS Config

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 Q9. Which is a better way to keep environment specific configuration in AWS Lambda - Environment Variables or external service like S3 or RDS ? Amazon Web Services (AWS)
Ans. Possible Answer - Env variable or use parameter store

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 Q10. How do you manage environment specific configuration for your lambda functions ?Amazon Web Services (AWS)
Ans. We are using Yaml for initializing configuration and Environment Variables for overriding them.

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 Q11. There is a server which is 90% full, I need to increase the space. How can I do it ?Server
Ans. Firstly ,we have removed old backup data from server after that we are checking which user consume high memory through df command.

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 Q12. Why serverless is called serverless if there are actually servers serving the requests ?Infrastructure
Ans. Because Vendors need not worry about provisioning , managing and maintaining the servers and it's intrinsically taken care of by AWS.

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 Q13. What is the use case of having Code Commit trigger within AWS Lambda ?Amazon Web Services (AWS)
Ans. If we would like a program to be executed if someone commits code to the repository.

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 Q14. What are the different trigger types in AWS Lambda ?Amazon Web Services (AWS)
Ans. Api Gateway
Alexa
CloudFront
CloudWatch
Code Commit
Kinesis
S3
SNS

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 Q15. What are the factors on which Lambda usage is priced ?Amazon Web Services (AWS)
Ans. No of requests, computation duration, assigned RAM

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 Q16. What are the advantages and disadvantages of using Lambda over EC2 ?Amazon Web Services (AWS)
Ans. Advantages -

Much Cheaper
Continuous scaling
Higher level and Serverless

Disadvantages -

Warm up time
Limited flexibility in terms of technologies
Limited control

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 Q17. Which AWS computing service provides IAAS, PAAS , Containerization and Serverless ?Amazon Web Services (AWS)
Ans. EC2 is IAAS
Elastic Beanstalk is PAAS
EKS is Containerization service
Lambda is Serverless

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   Like         Discuss         Correct / Improve     IAAS   PAAS    Containerization  Serverless


 Q18. Difference between Containerization and Serverless ? Infrastructure
Ans. Following are key differences between containers and serverless:

Supported host environments: Containers can run on any modern Linux server, as well as certain versions of Windows. In contrast, serverless runs on specific host platforms, most of which are based in the public cloud (like AWS Lambda or Azure Functions).

Self-servicing ability. For the reasons just noted, in most cases, serverless functions require you to use a public cloud. (There are on-premises serverless frameworks, like Fn, but these are not yet widely used.) With containers, you can set up your own on-premises host environment, or use a public cloud service like ECS.

Cost. Because serverless environments are hosted in the cloud, you have to pay to use them. In contrast, you can set up a container environment yourself using open source code for free (although you’ll still have management costs, of course).

Supported languages. You can containerize an application written in any type of language as long as the host server supports the language. Serverless frameworks are different; they support a limited number of languages. The details of supported serverless language vary from serverless platform to platform.

Statefulness. Most serverless platforms are designed to support stateless workloads. (Some serverless providers offer limited support for stateful services; cf. Durable Functions on Azure.) Although you can connect to external storage services (like S3 on AWS) from within serverless platforms, the functions themselves cannot be stateful. Containers present their own persistent storage challenges, but creating stateful containerized apps is certainly possible.

Availability. Serverless functions are designed to run for a short period—usually, a few hundred seconds—before they shut down. Containers can run for as long as you need.

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   Like         Discuss         Correct / Improve     Amazon Web Service (AWS)  serverless  containers  production support


 Q19. How does AWS Lambda handle failure during event processing?Amazon Web Services (AWS)
Ans. In AWS Lambda we can run a function in synchronous or asynchronous mode. In synchronous mode, if AWS Lambda function fails, then it will just give an exception to the calling application. In asynchronous mode, if AWS Lambda function fails then it will retry the same function at least 3 times.If AWS Lambda is running in response to an event in Amazon DynamoDB or Amazon Kinesis, then the event will be retried till the Lambda function succeeds or the data expires. In DynamoDB or Kinesis, AWS maintains data for at least 24 hours.

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 Q20. What are the advantages of going serverless against reserved servers ?Server
Ans. Quick Turnaround Time and Quick Time to Market
No Worry about the infrastructure , low maintenance
Cost only for use , not for reservation.
Multiple small applications instead of one big. Results in better uptime and mainetnability.

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 Q21. How can we schedule Lambda function to run daily ?Amazon Web Services (AWS)
Ans. We can schedule that through CloudWatch.

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 Q22. What would you do if you see an error thrown by a lambda function as "Access Denied" while doing something with S3 ?Amazon Web Services (AWS)
Ans. Just like people , AWS resources too have execution roles or permissions. Seems like in such a situation Lambda function may not have sufficient privileges to perform operations on S3. For example - The execution role of Lambda may just have read permissions on S3 and we may be trying to perform PutObject operation.

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   Like         Discuss         Correct / Improve     aws s3  aws storage  amazon cloud storage  amazon s3  aws lambda  aws serverless computing  amazon cloud serverless computing  amazon lambda


 Q23. If a high CPU Usage happens everyday at a particular time, How would you go about fixing it ?Server
Ans. We can provision more instances for that particular time slot.

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 Q24. What should we do If we need to know the IP of the machine where Lambda function runs ?Amazon Web Services (AWS)
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 Q25. What is Web Server and explain its types?Server
Ans. A program that uses HTTP for serving files that create web pages for users in response to their requests that are sent by the HTTP clients of their computer is called as a web server.

Web - Server Types

Apache HTTP Server by the Apache Software Foundation
Internet Information Service from Microsoft
Sun Java System Web Server
Jigsaw Server.

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 Q26. Can we reserve resources in AWS Lambda just like we do for Ec2 instances ?Amazon Web Services (AWS)
Ans. You can have reserved capacity with AWS Lambda. This guarantees that this number of concurrent Lambdas are always available for that function.

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 Q27. Can we build web services using AWS Lambda ?Amazon Web Services (AWS)
Ans. We have to complement it to AWS Gateway API.

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 Q28. Can you explain the integration between API Gateway and Lambda if we wish to develop services using these tools.Amazon Web Services (AWS)
Ans. We can create API gateway and give the name of lambda function in order to be linked with lambda function, deploy the API and whenever request will be made from API it will directly be linked to lambda function to perform further process.

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 Q29. What are the problems one could face while working with serverless technologies like AWS Lambda ?Amazon Web Services (AWS)
Ans. Warm up time for certain technologies like Java ( JVM Warmup )

Performance

Size of Deployable ( Bigger size packaging should go in S3 )

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 Q30. Tell me something about Amazon Lambda.Amazon Web Services (AWS)
Ans. AWS Lambda is an event-driven, serverless computing platform provided by Amazon as a part of Amazon Web Services. It is a computing service that runs code in response to events and automatically manages the computing resources required by that code. It was introduced in November 2014.

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