Step 1: What is Route 53? (Classroom Explanation)
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- "Imagine the internet is a giant city, and every website is a house with a unique address (IP address, like 192.0.2.1). But these addresses are hard to remember, so we give houses names—like 'www.example.com.'
Route 53 is like a super-smart phonebook that matches these names to their addresses so your browser can find them fast." - "Route 53 is Amazon’s tool to manage this phonebook (DNS) and decide how people (traffic) reach your websites or apps. It can even check if a website is 'open' and redirect people if it’s 'closed.'"
Key Points:
- DNS: Translates names to IP addresses.
- Routing: Controls where traffic goes (e.g., one server or many).
- Health Checks: Ensures your website is working.
Practical Article 1: Registering a Domain and Setting Up a Simple Website
Goal: Show how Route 53 connects a domain to a website.
Student Level: Beginner.
Real-World Example: "Imagine you open a lemonade stand called 'lemonadestand.com.' Route 53 helps customers find your stand by linking the name to your location (a web server)."
Steps (Simplified for Teaching):
- Get a Domain:
- "In real life, you’d buy a domain like 'lemonadestand.com' from Route 53 for $12/year. For class, let’s pretend we did this."
- Set Up a Website:
- "Your website is a simple page saying 'Welcome to Lemonade Stand!' hosted on an AWS S3 bucket (a storage space). Its address is something like 's3-website-us-east-1.amazonaws.com.'"
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- Link Domain to Website:
- "In Route 53, you create a 'hosted zone' for 'lemonadestand.com.' This is your phonebook page."
- "Add an 'A record' (like a phonebook entry) pointing 'lemonadestand.com' to your S3 bucket using an Alias (a special AWS shortcut)."
- Test It:
- "Type 'lemonadestand.com' in a browser, and Route 53 says, 'Go to the S3 bucket!' You see your welcome page."
Class Demo (No AWS Needed):
- Use paper: Write "lemonadestand.com" on one card and "S3 bucket address" on another. Draw an arrow between them labeled "Route 53 A Record." Explain how a browser follows this arrow.
Key Takeaway: "Route 53’s simplest job is connecting a name to one place."
Practical Article 2: Load Balancing Traffic with Weighted Routing
Goal: Teach how Route 53 splits traffic between multiple resources.
Student Level: Intermediate.
Real-World Example: "Now your lemonade stand is so popular, you open two stands—one in New York and one in California. Route 53 can send 70% of customers to New York (bigger stand) and 30% to California (smaller stand)."
Steps:
- Set Up Two Websites:
- "Pretend you have two S3 buckets: 'ny-lemonade.com' and 'ca-lemonade.com,' each with a welcome page."
- Create Weighted Records:
- "In Route 53’s hosted zone for 'lemonadestand.com,' add two A records:
- 'ny-lemonade.com' with weight 70.
- 'ca-lemonade.com' with weight 30."
- "Both records use the same name, 'lemonadestand.com,' but Route 53 decides who goes where."
- "In Route 53’s hosted zone for 'lemonadestand.com,' add two A records:
- How It Works:
- "Out of 100 customers, about 70 see the New York page, and 30 see the California page—it’s random but follows the weights."
- Test It:
- "Visit 'lemonadestand.com' multiple times; you’ll see different pages based on the weights."
Class Demo (No AWS Needed):
- Use a spinner or dice: Assign 1-7 as "New York" (70%) and 8-10 as "California" (30%). Spin/roll for 10 “customers” and tally where they “go.”
Key Takeaway: "Route 53 can split traffic to balance the load, like managing crowds at multiple stores."
Practical Article 3: Failover Routing with Health Checks
Goal: Show how Route 53 handles failures with a backup plan.
Student Level: Intermediate/Advanced.
Real-World Example: "Your New York lemonade stand is your main one, but if a storm shuts it down, Route 53 sends customers to California instead."
Steps:
- Set Up Primary and Backup:
- "Main site: 'ny-lemonade.com' (S3 bucket)."
- "Backup site: 'ca-lemonade.com' (another S3 bucket)."
- Add Health Check:
- "Tell Route 53 to check 'ny-lemonade.com' every 30 seconds. If it’s down (e.g., returns an error), mark it unhealthy."
- Create Failover Records:
- "In Route 53:
- Primary record: 'lemonadestand.com' to 'ny-lemonade.com' (if healthy).
- Failover record: 'lemonadestand.com' to 'ca-lemonade.com' (if primary fails)."
- "In Route 53:
- Simulate Failure:
- "Turn off 'ny-lemonade.com' (in real life, delete the S3 bucket temporarily). Route 53 notices and switches to 'ca-lemonade.com.'"
- Test It:
- "Visit 'lemonadestand.com'—you’ll see California’s page when New York is down."
Class Demo (No AWS Needed):
- Use two cards: "New York (Primary)" and "California (Backup)." Flip a coin for "health" (heads = healthy, tails = down). If New York is down, point students to California.
Key Takeaway: "Route 53 keeps things running by switching to a backup when something fails."
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