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https://www.udemy.com/aws-certified-solutions-architect-professional/learn/v4/t/lecture/8593860?start=0

Health Checks

• Health checks are responsible for monitoring the health of an endpoint
• Sends a request to the website at a specific time interval
• Website responds with a 200 code, the server is ‘healthy’
• If it fails, it can
  • Send an alert
  • Reroute traffic to another server

How to configure

• Route53 > Health checks > [Create health check]
• Provide a name
• What to monitor: endpoint
• Specify endpoint by
  • IP Address or [X] Domain name
  • Protocol: http
  • Enter domain name:
  • Port: 80
  • Path: point to path or file that will return a 200 or 300 code
• Advanced Configuration
  • Request Interval (How often to check the domain)
    • Standard 30 (default)
    • Fast 10 (Expensive!)
  • Failure threshold: How many times to fail before calling it a failure
  • String match: Route53 checks the first 5120 bytes for an exact match on the string you enter
    • If found, healthy
    • No found, not healthy
  • Latency graphs: display a graph
  • Invert health check status: if string is found, it is DOWN
  • Health checker regions: where should Route53 test from?