Showing posts with label serverless. Show all posts
Showing posts with label serverless. Show all posts

May 12, 2022

Top 20 AWS Cloud9 Interview Questions and Answers


                AWS Cloud9 is a browser-based integrated development environment (IDE) that allows you to write, run, and debug code. A code editor, debugger, and terminal are all included. Cloud9 is pre-installed with key tools for major programming languages such as JavaScript, Python, PHP, and more, so you don't have to install files or setup your development workstation to get started. Because your Cloud9 IDE is cloud-based, you may work on your projects from any internet-connected machine, including your office, home, or anyplace else. Cloud9 also offers a smooth development experience for serverless apps, allowing you to simply define resources, debug, and switch between local and remote execution. You can share your development environment with your team fast with Cloud9, allowing you to pair programme and track each other's inputs in real time.


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Ques. 1): How can I begin using AWS Cloud9?

Answer:

You can choose AWS Cloud9 from the AWS Management Console after logging in. The console will walk you through the options for choosing a Linux server to connect to Cloud9. In a few simple steps, you may either create a new Amazon EC2 instance (AWS Cloud9 EC2 environment) or connect your current Linux server (AWS Cloud9 SSH environment). You may access your IDE and write code in a fully configured development environment once you've created a Cloud9 environment.


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Ques. 2): Who should utilise Amazon Web Services Cloud9?

Answer:

AWS Cloud9 is available to everyone who writes code. Cloud9 provides instant access to a fully configured development environment in their browsers with preloaded runtimes, package managers, and debugging tools for those developing apps in Node.js (JavaScript), Python, PHP, Ruby, Go, and C++. Cloud9 allows you to access your work environment from any internet-connected computer, removing the need for a dedicated development machine.

AWS Cloud9 provides convenient access to their AWS resources via a preset AWS Command Line Interface (AWS CLI), ready to perform commands against AWS services, for AWS developers and those assessing new AWS services. Cloud9 has built-in tools for creating, editing, running, debugging, and deploying Lambda functions for those developing serverless apps on AWS Lambda using Node.js or Python.


AWS CloudFormation Interview Questions ans Answers


Ques. 3): What kinds of AWS Cloud9 development environments are there?

Answer:

You can use one of two types of AWS Cloud9 setups.

AWS Cloud9 EC2 environment — Allows you to create a new Amazon EC2 instance with Cloud9. These instances are set to terminate 30 minutes after you close the IDE and start immediately when you open it.

SSH environment on AWS Cloud9 — Allows you to join an existing Linux server to Cloud9. On the Linux server that you intend to use with Cloud9 SSH environments, certain requirements are required.


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Ques. 4): What is AWS Cloud9, exactly?

Answer:

AWS Cloud9 is a browser-based integrated development environment (IDE) that allows you to write, run, and debug code. It combines code completion, hinting, and step-through debugging with access to a full Linux server for running and storing code.


AWS Cloud Interview Questions and Answers


Ques. 5): How can I execute my code?

Answer:

The AWS Cloud9 IDE has a run button in the toolbar as well as built-in runners for over 10 languages that will immediately start your application with the most recent code modifications. You can also alter current runners, develop your own runners, or run your code from the terminal if you want complete control over how your product is run.


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Ques. 6): How much does AWS Cloud9 cost?

Answer:

AWS Cloud9 comes at no additional cost. You only pay for the compute and storage resources (i.e., an EC2 instance, an EBS volume) that are utilised to run and store your code if you use an Amazon EC2 instance for your AWS Cloud9 development environment. For no additional price, you can connect your Cloud9 development environment to an existing Linux server (e.g., on-premises server) through SSH.


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Ques. 7): What is the best way to use AWS Cloud9 with AWS CodeStar?

Answer:

You can start modifying and committing your CodeStar project code in the Cloud9 IDE right away after launching AWS Cloud9 environments from AWS CodeStar. Any code changes you commit to your project source repository from Cloud9 are compiled and deployed automatically using CodeStar's tools.


AWS EC2 Interview Questions and Answers


Ques. 8): What resources does AWS Cloud9 create for Amazon EC2 environments?

Answer:

AWS Cloud9 creates the needed computation and storage resources in your AWS account when you create an Amazon EC2 environment. An Amazon EC2 instance, an Amazon Elastic Block Store (EBS) volume of 8 GB, an Amazon EC2 security group, and an AWS CloudFormation stack are among the resources. These resources are accessible through the different AWS service consoles. Cloud9 automatically deletes these resources when you erase your environment.


AWS Lambda Interview Questions and Answers


Ques. 9): What is the location of my code on AWS Cloud9?

Answer:

Code files, packages, and dependencies are all kept in your resources in your AWS Cloud9 environment. Your data is stored in the appropriate Amazon Elastic Block Store (EBS) volume in your AWS account if you use an EC2 environment. Your data is saved locally on your Linux server if you use an SSH environment.


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Ques. 10): How can I use AWS Cloud9 to construct serverless applications for AWS Lambda?

Answer:

The AWS Resources panel in the IDE contains the built-in tools for AWS Lambda. These utilities can be used to import or generate Lambda functions in Node.js and Python. These routines can be quickly launched, previewed, debugged, and deployed right from the IDE. The AWS Serverless Application Model (AWS SAM) framework is also supported by AWS Cloud9. You may now handle many Lambda functions and serverless resources in your application with ease. If you used AWS CodeStar to provide your project, any changes you make to it will be built and sent to Lambda using git push.


AWS Simple Storage Service (S3) Interview Questions and Answers


Ques. 11): Is it possible to modify the instance type of an Amazon EC2 environment that already exists?

Answer:

Yes. With your AWS Cloud9 environment, you can change the Amazon EC2 instance type you previously selected. To do so, go to the EC2 console and locate your instance, then follow the procedures in the Amazon EC2 documentation.


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Ques. 12): Can I use AWS Cloud9 to test my AWS Lambda functions locally?

Answer:

Yes. AWS Cloud9 can run your Node.js and Python functions locally in the IDE, simulating the AWS Lambda execution environment. This allows you to step-through debug your serverless applications without having to upload your changes to Lambda. You may also deploy your application modifications to Lambda directly from the IDE once they've been tested.


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Ques. 13): What are the supported programming languages?

Answer:

Node.js (JavaScript), Python, PHP, Ruby, Go, and C++ are among the programming languages supported by AWS Cloud9. It supports several major programming languages and offers features including syntax highlighting, outline view, code hinting, code completion, application runners, and step-through debugging.


AWS DynamoDB Interview Questions and Answers


Ques. 14): How do I make changes to my code?

Answer:

Auto-completion, code folding, hinting, syntax highlighting, and line manipulation are all included in the AWS Cloud9 IDE's powerful code editor. You can choose from over 30 colour schemes in the code editor to manage syntax highlighting and the UI. You may also update your CSS to completely personalise the Cloud9 UI.


AWS Cloudwatch interview Questions and Answers


Ques. 15): Is AWS Cloud9 capable of managing resources developed in Amazon EC2 environments?

Answer:

Cloud9 can not only create and delete your AWS Cloud9 EC2 environment resources on your behalf, but it can also start and stop the EC2 instances automatically to save you money. All other administration chores on these resources are your responsibility, including installing software patches on your EC2 instances and backing up your EBS volumes.


AWS Elastic Block Store (EBS) Interview Questions and Answers


Ques. 16): How do I access AWS services from AWS Cloud9?

Answer:

AWS Cloud9 EC2 environments come preinstalled with the AWS CLI, which is authenticated with the permissions of the logged-in AWS user automatically. This enables you to run interactive CLI commands against AWS services from the built-in terminal window in Cloud9 without any additional configuration.


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Ques. 17): In AWS Cloud9 environments, are my Amazon EC2 instances always active?

Answer:

No. For Amazon EC2 instances created with AWS Cloud9, the default auto-hibernation option is 30 minutes. Your EC2 instances will automatically halt 30 minutes after you close the IDE and resume only when you reopen it with this option. As a result, EC2 instance charges are often only incurred when you are actively working. When your instance needs to be restarted, you lose any open terminal sessions in the IDE and may have to wait a bit to open it. You can modify the auto-hibernation setting and even choose to keep your EC2 instance "always on" depending on your use case.


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Ques. 18): On AWS Cloud9 EC2 setups, what tools and packages are preinstalled?

Answer:

AWS Cloud9 EC2 setups provide popular development tools like Git and Docker preinstalled. Many popular programming languages, such as Node.js and Python, have language runtimes and package managers.


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Ques. 19): What is the best way to share my AWS Cloud9 installation with others?

Answer:

Click the Share button in the top right corner of your IDE to share your AWS Cloud9 environment. The AWS Identity and Access Management (IAM) user name and desired access levels for the individual with whom you want to collaborate are requested. Once you've entered these details, both participants can use the environment for real-time collaboration on IDE features and command line sessions.


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Ques. 20): What are the steps for connecting to source control management systems?

Answer:

You may use the same command line tools on your local PC to access your source control system by opening the terminal window within the IDE. Git is preinstalled on AWS Cloud9 EC2 environments, making it easy to retrieve your source code.


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November 22, 2021

Top 20 Aws Lambda Interview Questions & Answers

 

Ques: 1). What exactly is AWS Lambda?

Answer:

AWS Lambda is a serverless computing solution that is one of the best on the market. It enables you to run code without the need for server management or setup. When you consume data, you must pay for the computation time. When you are not running your code, there are no fees to pay. You may use Lambda to run code for any application or backend service virtually, without having to worry about management. All you have to do is upload the code, and Lambda will handle the rest. Lambda is a high-availability service that runs and scales your code. You may even set up the code to call it straight from the mobile app or the web, or from any other AWS accessible.


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Ques: 2). What is the purpose of Lambda?

Answer:

If you need a rapid, one-time function that accomplishes something simple and doesn't require long-running operations or expensive calculations, and you only need it to execute for a brief amount of time, Lambda functions are ideal. They can be provided as parameters into higher-order functions, making them handy in situations when other types of code might not be suitable for the task at hand.


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Ques: 3). What types of programmes can be run on AWS Lambda?

Answer:

AWS Lambda makes it simple to complete a variety of tasks in the cloud. AWS Lambda, for example, can be used to fetch and transform data from Amazon DynamoDB in mobile back-ends. Other tasks that may be done in the cloud with the help of AWS Lambda include handlers that alter and compress objects when they are uploaded to Amazon S3, server-less streaming data processing with Amazon Kinesis, and reporting and auditing of API calls made to any of Amazon's Web Services.


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Ques: 4). What distinguishes Lambda as a time-saving strategy?

Answer:

This is for a variety of reasons. The first is that everything can be stored in the local server memory. Furthermore, data can be directly stored in the database without compromising performance. Additionally, testing is not very difficult. Multiple vendors can simply make integration testing more powerful.


 AWS RedShift Interview Questions and Answers


Ques: 5). What are your thoughts on Auto-Scaling?

Answer:

It's essentially an Amazon Web Services capability that allows you to automatically configure and start up new instances. The good news is that you are not required to intervene at any point. Users may, however, keep track of everything using metrics and criteria. Simply cross a threshold to activate this task, and you'll notice that the instances have scaled horizontally without any intervention.


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Ques: 6). How can a serverless application be automated?

Answer:

An AWS CodePipeline and an AWS CodeDeploy can be used to automate the serverless application's release process. The CodePipeline is a continuous delivery service that allows for the modelling, visualisation, and automation of essential procedures, allowing for the deployment of server-less applications. For Lambda-based apps, CodeDeploy also has an automated deployment engine. It enables you to coordinate deployments using best-practice approaches such as canary and linear deployments, as well as assisting you in establishing major barriers to ensure that the newly deployed software is secure, stable, and ready for industrial usage.


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Ques: 7). What is the best way to troubleshoot a serverless application?

Answer:

By adding X-Ray permissions to the Lambda function's role of execution and changing the function's "mode of tracing" to "active," a Lambda function can be activated for tracking with AWS X-Ray. When you enable X-ray for Lambda functions, AWS Lambda will provide tracing data to X-Ray, including information about the Lambda service used to invoke the function. This will show you the overhead of the Lambda service, the time it takes to execute a function unit, and the time it takes to execute a function. Also, the X-Ray SDK can be included in Lambda deploying the package to create one’s segments of the trace, annotate one’s marks, or view the trace segments for various downstream calls that are made from Lambda function. X-Ray SDKs are presently available for Node.js and Java. Visit the Troubleshooting applications based on Lambda to learn more. AWS X-Ray rates shall apply.


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Ques: 8). Is there a limit on how many AWS Lambda functions may be run at the same time?

Answer:

No. AWS Lambda is built to run multiple instances of functions at the same time. AWS Lambda, on the other hand, has a safety threshold set by default for some consecutive runs for each account per region. The maximum number of times a single AWS Lambda function can be executed in a row can be adjusted, which can be used to set aside a portion of the account concurrency threshold for key functions or reduce traffic rates to downstream resources.


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Ques: 9). What is the definition of a server-less application?

Answer:

Lambda-based apps (also known as server-less applications) are built up of functions that are triggered by different events. One or more of these methods are triggered by events such as object upload to Amazon S3, Amazon SNS, or API activities in a standard server-less application. The functions can work independently or in conjunction with other resources such as DynamoDB tables or Amazon S3 buckets. A function is the most common serverless application.


AWS Database Interview Questions & Answers


Ques: 10). What precisely is deployment automation?

Answer:

It's a lot like programming in another language. However, it alleviated many of the difficulties. The nicest part is the deployment of a pipeline that can be readily built as one gains experience. Automated Deployment reduces human intervention and assists enterprises in ensuring quality-based and best-in-class outcomes.

 

Ques: 11). What are the features of AWS Lambda that make deployments more automated?

Answer:

AWS lambda supports a variety of environmental factors. When it comes to altering the deployment package, they can be utilised for data and a variety of additional credentials. It also allows aliases because it's a serverless technique. There are a few categories that you may simply think about, such as stage production and development. As a result, functions may be readily evaluated for testing without disrupting the production code. Because the end-point does not change frequently, it is possible to keep up with the task's pace.

 

Ques: 12). What are the benefits of employing a server-less approach?

Answer:

To begin with, this technique features straightforward procedures that allow for a faster time to market and increased revenue. Users only have to pay when the code is compiling, therefore increasing profitability can save a lot of money. Managing the components of the larger application is also not difficult. Furthermore, the additional infrastructure is not required. The biggest advantage is that customers don't have to worry about the servers where the code is run.

 

Ques: 13). What is the definition of an external extension? What are some external Lambda runtime extensions?

Answer:

An external extension is one that continues to execute as a separate process in the execution even after the function call has completed. External extensions for Lambda runtimes include:

  • NET Core 3.1 (C#/PowerShell) ( dotnetcore3. 1 )
  • Custom runtime ( provided )
  • Custom runtime on Amazon Linux 2 ( provided. al2 )
  • Java 11 (Corretto) ( java11 )
  • Java 8 (Corretto) ( java8. al2 )

 

Ques: 14). Is it possible to scale Amazon Instance vertically? If so, how would you go about doing it?

Answer:

Yes, it is feasible to scale an Amazon Instance vertically. Here's how to do it:

  • On top of the already controlling instance, form and twist a new enormous instance.
  • Try delaying the present instance and separating the source web mass of dispatch and the server.
  • The next step is to terminate your current instance and detach it from the source quantity.
  • Make a note of the new machine ID and use the same source mass on your new server.

 

Ques: 15). What are the many ways to activate Lamda?

Answer:

Lambda can be triggered in three different ways.

API Gateway event:

These are what are known as standard events. When someone calls an API Gateway For Lambda, it will call your lambda function. If you're using the Serverless Framework, you'll need to specify which event type was triggered in the configuration, or serverless.yml.

S3 events:

S3 events happen when someone(s) changes the contents of an S3 bucket. A file can be created, removed, or updated to change the content. When you specify an event, you can choose whether the lambda function creates, destroys, or changes a file.

DynamoDB events:

When someone makes a modification to a record in a DynamoDB table, all of the changes are immediately published in a stream, and the lambda is triggered because there is data in the stream. When there is data in the stream, Lambda can be activated in two different ways. First, the lambda will only be called once if there is specific data in the stream, such as a single database change at a specific time. The second method Lambda is activated is when a stream of events is processed together. Because streams are rather rapid, this significantly reduces the amount of time spent running.

 

Ques: 16). What are the drawbacks of a serverless architecture?

Answer:

Everything in the Aws lambda has its own set of advantages and disadvantages, depending on the task at hand.

In the serverless technique, the upper limit is strictly on vendor control, which results in higher downtime.

Other difficulties include the loss of system operation and the system's constraints. AWS serverless solution requires dedicated hardware, which is not available.

Most of the time, it is the customer's blunders that cause the issues.

 

Ques: 17). What are the best security techniques in Lambda?

Answer:

In terms of security, Lambda has some of the best solutions. Identity Access and Management can be used. When it comes to regulating access to resources, this might be advantageous. Another option is privilege, which essentially expands the permissions. Access might be blocked to untrustworthy or unauthorised hosts. The security group has regulations that can be reviewed over time to stay up with the pace.

 

Ques: 18). In Lambda, what is SQS? What function does it have?

Answer:

SQS is essentially a method for sharing and transmitting information between hosts and connectors. Different Lambda components can be made available, or in other words, communication can be enabled. Even if the functional components aren't the same, they can be linked together. This strategy can eliminate a lot of failures, and components can communicate well with one another.

 

Ques: 19). In Lambda, what are Final Variables and Effectively Final Variables?

Answer:

Final variables are ones that can't be changed once they've been assigned. They are called essentially variable when they are in an early stage where any type of change is possible. They have yet to be assigned a value. In many circumstances, the outcome is required without constraint, which is why effective variables are used. They can also help with testing. Effective Variables can be used to empower final variables with a variety of additional capabilities. In Lambda, the majority of local expressions are final.

 

Ques: 20). What are the different types of storage that Amazon offers?

Answer:

There are a variety of storage options for Amazon Lambda, and the main thing to remember is that all of them are the finest in terms of durability and performance. It would not be a problem if you used them together. Accessibility for people with disabilities is also available. Let me give you a few examples, such as EBS, which is a storage tool that is essentially block-level storage. This comes with encryption capabilities, and it's an excellent alternative to think about if your system requires independent storage. The next category is EC2 instances, which are storage discs that are directly attached to the host PC.

This sort of storage is only employed for a short period of time. After then, the user can think about good storage. Until the instances are valid, the user data will be valid. The user can utilise this storage to run instances. The next type is Adding storage -> this is a type of root storage device. This is where you'll find information on the boot instance. The third type is Amazon S3, which is another AWS lambda storage option that is considered a low-cost alternative that can store any quantity of data.