Creating and Monitoring Health Checks in AWS Route 53

In this lesson, we explored how to create health checks for EC2 instances using AWS Route 53. Health checks are crucial for monitoring the availability of instances and ensuring high availability in distributed systems. Below, we summarize the key steps and concepts covered.

1. Creating Health Checks for EC2 Instances

To set up health checks in Route 53, follow these steps:

Step 1: Navigate to Health Checks

• In the AWS Route 53 console, go to the Health Checks section.
• Click Create health check.

Step 2: Define Health Check Parameters

For each EC2 instance:

• Specify an endpoint:
  • Choose between IP address or domain name (we use IP addresses here).
• Select a port:
  • Use port 80 for HTTP-based checks.
• Set the path:
  • Default: / (root).
  • Common alternative: /health (often used in real applications for dedicated health check responses).

Step 3: Configure Advanced Settings

• Check frequency:
  • Standard: Every 30 seconds.
  • Fast: Every 10 seconds (more expensive).
• Failure threshold:
  • Number of failed attempts before considering the instance unhealthy.
• String matching (optional):
  • Look for a specific string in the first 5,120 bytes of the response.
• Latency graph:
  • Enable tracking of response times.
• Invert health status (optional):
  • Flip health check logic if needed.
• Regions for health checkers:
  • Use AWS-recommended regions for global health monitoring.