Serverless AWS Lambda Development · 课时

使用 AWS Secrets Manager 管理机密

使用 AWS Secrets Manager 在无服务器应用中安全地存储、读取和轮换敏感凭据与 API 密钥

使用 AWS Secrets Manager 管理机密 是 CoddyKit 上的免费 Serverless AWS Lambda Development 课时。这是第 2 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Serverless AWS Lambda Development 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Serverless AWS Lambda Development 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Secrets Manager: The Basics

Welcome! In serverless applications, managing sensitive data like database passwords or API keys is crucial. Hardcoding these values is a major security risk.

AWS Secrets Manager helps you securely store, manage, and retrieve these secrets throughout their lifecycle.

Why Not Hardcode?

Hardcoding secrets directly in your Lambda function code or configuration files is a bad practice. Here's why:

Security Risk: If your code repository is compromised, your secrets are exposed.
Maintenance: Changing a secret requires code redeployment.
Compliance: Many security standards forbid hardcoded credentials.

How Secrets Manager Works

Secrets Manager encrypts your secrets at rest and in transit. It provides a dedicated API to retrieve them programmatically when needed.

This means your Lambda function requests the secret at runtime, never storing it directly in its code or environment variables.

Creating a Secret

You can create a secret in the AWS Management Console, through the AWS CLI, or using an AWS SDK.

When creating a secret, you specify its type (e.g., database credentials, API key), the actual secret value, and optional rotation settings.

Retrieving Secrets in Lambda

In your Lambda function, you'll use the AWS SDK (e.g., boto3 for Python) to call the Secrets Manager API. Specifically, the GetSecretValue operation.

This operation securely fetches the secret and returns it to your function for use.

Python Retrieval Example

This Python snippet shows how a Lambda function would retrieve a secret named MyDatabaseSecret. Remember, your Lambda's IAM role needs permission to access the secret!

import boto3
import json
from botocore.exceptions import ClientError

def get_secret(secret_name):
    client = boto3.client('secretsmanager')
    try:
        get_secret_value_response = client.get_secret_value(
            SecretId=secret_name
        )
    except ClientError as e:
        # Handle errors like ResourceNotFoundException
        print(f"Error retrieving secret: {e}")
        raise e
    else:
        if 'SecretString' in get_secret_value_response:
            return get_secret_value_response['SecretString']
        # For binary secrets, use 'SecretBinary'
        return None

# This is a runnable example, not a full Lambda handler.
# In a real Lambda, 'event' and 'context' would be parameters.
if __name__ == "__main__":
    print("--- Simulating Secret Retrieval ---")
    print("Attempting to retrieve 'MyDatabaseSecret'...")
    try:
        # In a real scenario, replace with your secret's actual name
        # secret_json = get_secret('MyDatabaseSecret')
        # if secret_json:
        #     secret_data = json.loads(secret_json)
        #     print(f"Username: {secret_data.get('username')}")
        #     print(f"Password (first 5 chars): {secret_data.get('password')[:5]}...")
        # else:
        #     print("Secret could not be retrieved or was binary.")
        print("Retrieval logic demonstrated. Remember IAM permissions!")
    except Exception as e:
        print(f"An error occurred during simulation: {e}")

IAM Permissions for Secrets

For your Lambda function to retrieve a secret, its execution role must have the necessary IAM permissions.

Specifically, it needs secretsmanager:GetSecretValue on the target secret(s). It's best practice to grant access only to the secrets your function absolutely needs.

Automated Secret Rotation

One of Secrets Manager's powerful features is automated secret rotation. This enhances security by regularly changing credentials without manual intervention.

You can configure rotation for various services like RDS databases. Secrets Manager uses a Lambda function to perform the actual rotation.

Best Practices for Secrets

When using AWS Secrets Manager:

Least Privilege: Grant only necessary GetSecretValue permissions.
Rotate Regularly: Enable automated rotation whenever possible.
Monitor Access: Use CloudTrail to audit who accessed your secrets.
Encrypt Further: Use KMS keys for custom encryption if needed.

Check Your Knowledge

Which of the following are key benefits of using AWS Secrets Manager for serverless applications?

Recap: Secure Your Secrets!

You've learned how AWS Secrets Manager is a vital tool for securing your serverless applications.

It centralizes and encrypts sensitive data.
It enables secure, on-demand retrieval by Lambda functions.
It supports automated rotation for enhanced security.
Proper IAM permissions are crucial for access control.

By using Secrets Manager, you significantly reduce security risks associated with managing credentials.

常见问题解答

「使用 AWS Secrets Manager 管理机密」课时是免费的吗？

是的 — 「使用 AWS Secrets Manager 管理机密」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Serverless AWS Lambda Development 课程的其余内容，请升级到 CoddyKit PRO。 Serverless AWS Lambda Development 课程共包含 4 节课。

「使用 AWS Secrets Manager 管理机密」这节课中我会学到什么？

使用 AWS Secrets Manager 在无服务器应用中安全地存储、读取和轮换敏感凭据与 API 密钥你通过在浏览器中直接运行的动手代码来练习 Serverless AWS Lambda Development，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Serverless AWS Lambda Development 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Serverless AWS Lambda Development 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 2 节课，共 4 节。

「使用 AWS Secrets Manager 管理机密」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Serverless AWS Lambda Development 课中编写并运行代码吗？

能。每节 Serverless AWS Lambda Development 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

← 返回 Serverless AWS Lambda Development