When working with AWS CDK and Fargate, it is common to come across the need to add container secrets to your task definition. In this article, we will explore three different ways to achieve this using Python.

Option 1: Using the AWS CDK Constructs Library

The AWS CDK Constructs Library provides a high-level, object-oriented API for defining AWS infrastructure resources. To add container secrets to your Fargate task definition using this library, you can follow these steps:

from aws_cdk import core
from aws_cdk.aws_ecs import FargateTaskDefinition, ContainerSecret

app = core.App()
stack = core.Stack(app, "MyStack")

task_definition = FargateTaskDefinition(stack, "MyTaskDefinition")
container = task_definition.add_container("MyContainer")

container.add_container_secrets(
    ContainerSecret.from_secrets_manager("MySecret")
)

app.synth()

This code creates a new Fargate task definition and adds a container to it. The `add_container_secrets` method is then used to add a secret from AWS Secrets Manager to the container.

Option 2: Using the AWS SDK for Python (Boto3)

If you prefer to use the AWS SDK for Python (Boto3) directly, you can achieve the same result by following these steps:

import boto3

client = boto3.client("ecs")

response = client.register_task_definition(
    family="MyTaskDefinition",
    containerDefinitions=[
        {
            "name": "MyContainer",
            "secrets": [
                {
                    "name": "MySecret",
                    "valueFrom": "arn:aws:secretsmanager:us-east-1:123456789012:secret:MySecret-AbCdEf"
                }
            ]
        }
    ]
)

This code uses the `register_task_definition` method of the ECS client to register a new task definition. The `containerDefinitions` parameter is used to specify the container and its secrets.

Option 3: Using AWS CloudFormation

If you prefer to use AWS CloudFormation to define your infrastructure, you can use the following CloudFormation template:

Resources:
  MyTaskDefinition:
    Type: AWS::ECS::TaskDefinition
    Properties:
      Family: MyTaskDefinition
      ContainerDefinitions:
        - Name: MyContainer
          Secrets:
            - Name: MySecret
              ValueFrom: arn:aws:secretsmanager:us-east-1:123456789012:secret:MySecret-AbCdEf

This CloudFormation template defines an ECS task definition with a container and its secrets.

After exploring these three options, it is clear that using the AWS CDK Constructs Library provides a more concise and readable way to add container secrets to your Fargate task definition. It abstracts away the low-level details and provides a higher-level API for defining your infrastructure resources. Therefore, option 1 is the recommended approach for solving this Python question.