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aws_ecs_service_connect

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Guide on deploying Microservices on AWS with ECS Service Connect

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---

<br />
<div align="center">
    <p>Copyright (c) 2024, <a href="https://github.com/programmingwithalex">GitHub@programmingwithalex</a></p>

<h3 align="center">AWS ECS Service Connect</h3>

<p align="center">
    Microservices on AWS with ECS Service Connect
    <br />
    <a href="https://www.youtube.com/watch?v=rK__7D9-HbY&list=PLbn3jWIXv_iZhs7hxhKlCoBRrrLQ2OG6Z&index=1">View YouTube Demo</a>
    ·
    <a href="https://github.com/programmingwithalex/aws_ecs_service_connect/issues/new?labels=bug&template=bug-report---.md">Report Bug</a>
    ·
    <a href="https://github.com/programmingwithalex/aws_ecs_service_connect/issues/new?labels=enhancement&template=feature-request---.md">Request Feature</a>
  </p>
</div>

<details>
  <summary>Table of Contents</summary>
  <ol>
    <li>
      <a href="#series-outline">Series Outline</a>
      <ul>
        <li><a href="#aws-components">AWS Components</a></li>
      </ul>
    </li>
    <li>
      <a href="#getting-started">Getting Started</a>
      <ul>
        <li><a href="#prerequisites">Prerequisites</a></li>
        <ul>
            <li><a href="#software">Software</a></li>
            <li><a href="#aws">AWS</a></li>
            <li><a href="#cmd-line">CMD Line</a></li>
          </ul>
      </ul>
    </li>
    <li><a href="#commands">AWS (CDK) Commands</a></li>
    <li><a href="#references">References</a></li>
  </ol>
</details>

## Series Outline

1. Get microservices example running locally using `docker-compose`

1. Create working example of microservices on AWS using [ECS Service Connect](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/service-connect.html)
    * will not be production ready
    * will rely on a lot of default values provided by AWS, with no networking setup by us

1. Create production-ready example of microservices on AWS using [ECS Service Connect](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/service-connect.html)
    * configure networking setup and apply that to ECS components

1. Use GitHub Actions to automate deployments to AWS ECS components, referred to as Continuous Deployment (CD)

1. Create networking setup and ECS components automatically with a single script using [AWS CDK](https://docs.aws.amazon.com/cdk/v2/guide/home.html)

### AWS Components

- Virtual Private Cloud (VPC)
- NAT Gateway & Internet Gateway (IGW)
- Elastic Container Registry (ECR)
- Elastic Container Service (ECS)
- ECS Clusters
- ECS Services
- ECS Task Definitions
- Cloud Map
- Application Load Balancer (ALB)
- AWS Cloud Development Kit (CDK)
  - written in Python

## Getting Started

### Prerequisites

#### Software

- Python: version requirement determined by [AWS CLI requirement](https://github.com/aws/aws-cli) and optionally [AWS CDK requirement](https://github.com/aws/aws-cdk)
- [Docker Desktop](https://www.docker.com/products/docker-desktop/): account not required, just installation

#### AWS

- create [AWS IAM user account](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_users_create.html) than can be configured with the AWS CLI

#### CMD Line

- follow setup guides for [`aws-cli`](https://github.com/aws/aws-cli?tab=readme-ov-file#getting-started) if not already configured

## AWS Cloud Development (CDK)

### Installation (Windows)

- [download](https://nodejs.org/en/download/prebuilt-installer) `node.js`, includes `npm` which is necessary to install the `aws-cli`
- [install](https://docs.aws.amazon.com/cdk/v2/guide/getting_started.html) `aws-cdk`

```bash
npm install -g aws-cdk
```

### Commands

- `cdk init app --language python` - create the initial CDK app locally
- `cdk bootstrap` - deploying the AWS CDK for the first time
- `cdk synth` - constucts CloudFormation template and does some verification checks
- `cdk deploy --all` - deploy all CDK components
- `cdk destroy --all` - destroys all CDK components
  - issue with calling because of Fargate Cluster dependency - `FargateCluster/FargateCluster (...) Resource handler returned message: "The specified capacity provider is in use and cannot be removed.`
  - if called **twice** then all elements will be deleted

## References

https://docs.aws.amazon.com/AmazonECS/latest/developerguide/create-application-load-balancer.html
> If your service's task definition uses the awsvpc network mode (which is required for the Fargate launch type), you must choose IP addresses as the target type. This is because tasks that use the awsvpc network mode are associated with an elastic network interface, not an Amazon EC2 instance.

https://stackoverflow.com/questions/42715647/whats-the-target-group-port-for-when-using-application-load-balancer-ec2-con
> Protocol port will be overriden by ECS anwyays so doesn't matter.

https://www.cloudkeeper.com/insight/blog/amazon-ecs-service-communication-via-service-discovery-connect
> Choose client and server service if the container exposes and listens on a port for network traffic. This service gets an endpoint to communicate with any service within the same namespace

[CDK Workshop](https://cdkworkshop.com/)
> Instructions on using the AWS Cloud Development Kit (CDK)

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