# 🗄️ Day 4 – Databases, Lambda & Automation

Welcome to **Day 4** of the **7 Days of AWS Challenge** 🚀  
Today, you’ll move beyond basic compute and storage into **databases**, **serverless**, and **automation**.  
You’ll learn how to migrate, scale, and optimize applications the AWS way!

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## **🧠 Concepts to Learn**

### **💾 Amazon RDS**

Amazon Relational Database Service (RDS) lets you easily set up, operate, and scale a relational database in the cloud.  
You can choose engines such as **MySQL, PostgreSQL, MariaDB, Oracle, or SQL Server**, and AWS handles backups, patching, and monitoring for you.

### **⚡ DynamoDB**

A fully managed **NoSQL** database service that provides **millisecond performance** at any scale.  
Perfect for applications that need high availability and flexible schema.

📘 [Getting Started with DynamoDB](https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GettingStartedDynamoDB.html)

### **🌀 AWS Lambda**

Lambda lets you **run code without provisioning servers.**  
You just upload your function, and AWS runs it automatically in response to triggers such as S3 events or CloudWatch schedules.

📘 [AWS Lambda Documentation](https://docs.aws.amazon.com/lambda/?icmpid=docs_homepage_featuredsvcs)

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## **🎯 Tasks for Day 4**

### **🪜 Task 1: Learn & Share**

* Read about **AWS RDS**, **DynamoDB**, and **AWS Lambda**.
    
* Write a LinkedIn post in your own words with a short example for each.
    
* Use hashtags **#7DaysOfAWS** and **#AWSwithTWS**, and tag [@TrainWithShubham](https://www.linkedin.com/in/shubhamlondhe1996/).
    

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### **🪜 Task 2: Database Migration to RDS**

**Scenario:**  
You’re part of a team migrating an e-commerce platform’s self-managed MySQL database to Amazon RDS to improve scalability and manageability.

**What to do:**

* Set up and configure a **MySQL RDS instance** with optimal performance.
    
* Establish a secure connection between the **RDS** instance and your **EC2** application environment.
    
* Test the migration by connecting and performing CRUD operations.
    

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### **🪜 Task 3: Deploy a Scalable Web Application**

Build a **two-tier Flask application** with:

* A **MySQL database** managed by Amazon RDS.
    
* A **Flask-based web app** deployed on EC2 inside an **Auto Scaling Group** behind an **Elastic Load Balancer**.
    

Use this repo to get started:  
👉 [Two-Tier Flask App on AWS](https://github.com/LondheShubham153/two-tier-flask-app)

> 💡 This exercise demonstrates how real-world web apps scale seamlessly on AWS.

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### **🪜 Task 4: Automate EC2 Start/Stop Using Lambda**

**Scenario:**  
You’re managing a budget-friendly project and want to save costs by automatically starting/stopping EC2 instances during non-business hours.

**What to do:**

* Create an **AWS Lambda function** that starts or stops EC2 instances based on instance tags.
    
* Use **Python Boto3** and **EventBridge** (CloudWatch Events) to schedule the function.
    

📖 Reference → [Start/Stop Instances with Lambda + EventBridge](https://repost.aws/knowledge-center/start-stop-lambda-eventbridge)

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## **💬 Engagement Activity**

✅ Post your **Day 4** learnings on **LinkedIn** using

> `#7DaysOfAWS` `#AWSwithTWS`

Mention:

> “Day 4 of my 7 Days of AWS Challenge with @TrainWithShubham 🚀  
> Today I worked with RDS, DynamoDB, Lambda & automation — making AWS do the heavy lifting!”

You can also:

* Comment on or share 2 other learners’ posts.
    
* Ask a question in our [Discord Community](https://discord.gg/7GjDgDHR49).
    
* Share your Lambda automation snippet!
    

The more you share, the stronger your AWS visibility becomes 🌟

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## **🧩 Finding It Difficult?**

Reach out for help on:

* 💬 [LinkedIn](https://www.linkedin.com/in/shubhamlondhe1996/)
    
* 💭 [Discord Community](https://discord.gg/7GjDgDHR49)
    
* 🌐 [Official Website](https://trainwithshubham.com/)
    

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## **📚 References**

* [AWS RDS & DynamoDB Docs](https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GettingStartedDynamoDB.html)
    
* [AWS Lambda Docs](https://docs.aws.amazon.com/lambda/?icmpid=docs_homepage_featuredsvcs)
    
* [Python Boto3 Docs](https://boto3.amazonaws.com/v1/documentation/api/latest/index.html)
    

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## **🌟 Bonus Tip**

> Automate everything you can — databases, apps, and even servers.  
> The more you automate, the more time you save for innovation!

Happy Learning ✨  
**– TrainWithShubham**