AWS Networking -1

 

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Region : A region has several Availability Zones. In order to put your own virtual private network.
you put up the VPC

In order to put up your own private network which is Virtual Private Cloud . You get one big Address range . It is one Big Private Address Space.


1.  Networking in the cloud


aws connecting applications to other applications on the cloud


Connecting applications to other applications on the cloud using AWS (Amazon Web Services) can be done in a variety of ways depending on what exactly you're trying to connect and the architecture you're working with. Here’s a breakdown of how it typically works:

Common Ways to Connect Applications on AWS

1. APIs & API Gateway

  • Use Case: One application exposes a service (like user data) and another consumes it.

  • Tool: Amazon API Gateway

  • How it works: You can create RESTful or WebSocket APIs that connect to AWS Lambda functions, ECS containers, or EC2 instances.

2. Event-Driven Architecture

  • Use Case: One app triggers an event that another app reacts to (e.g., uploading a file triggers data processing).

  • Tool: Amazon EventBridge, Amazon SNS, or Amazon SQS

  • How it works: Decouples services so they can scale and evolve independently.

3. VPC Peering / PrivateLink

  • Use Case: Two applications in separate VPCs (Virtual Private Clouds) need private communication.

  • Tool: VPC Peering, AWS PrivateLink

  • How it works: Enables direct, secure connections between services, avoiding the public internet.

4. AWS Lambda (Serverless)

  • Use Case: Lightweight compute needed to connect apps, do data transformation, or trigger workflows.

  • How it works: You write small bits of code that are triggered by events from other AWS services.

5. Service Mesh (App-to-App Communication in Microservices)

  • Use Case: When you have multiple microservices that need to discover and securely talk to each other.

  • Tool: AWS App Mesh

  • How it works: Handles service discovery, traffic routing, and observability.

6. Direct Integration with AWS Services

  • Applications can directly call AWS services like:

    • Amazon DynamoDB (database)

    • Amazon S3 (file storage)

    • AWS Step Functions (workflow orchestration)

    • Amazon RDS / Aurora (relational databases)

 Security Considerations

  • Use IAM Roles & Policies to manage access.

  • Use TLS encryption for data in transit.

  • Consider using Amazon Cognito or OAuth2/OpenID for secure authentication between services.

 Example Scenario

Let’s say you have:

  • A web frontend hosted on S3 + CloudFront

  • A backend API in Lambda behind API Gateway

  • A database in DynamoDB

The frontend calls the API via API Gateway, which triggers Lambda, which reads/writes from DynamoDB. All connected securely, scalably, and serverlessly.


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