
AWS Certified Advanced Networking – Specialty (ANS-C01) Certification Guide
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Route 53 can perform health checks on resources and send alerts on failure, as well as being used to trigger the automatic failover of DNS records. The simplest way to use them is to associate them with RRs in a failover routing configuration.
Route 53 has three types of configurable health checks it can perform: the status of an HTTP(S) or TCP endpoint, calculated (combination of health checks), and the status of an Amazon CloudWatch alarm.
The endpoint status check tests to see if an endpoint, such as a web server, mail server, and so on, is online. The check can use HTTP, HTTPS, or TCP. The default interval is 30 seconds, with a 10-second interval available for an extra charge. TCP is a simple connection test; the HTTP(S) test can poll for a specific resource, such as a file. The HTTP(S) check status can also perform string matching on the response body.
By default, the endpoint status check uses health checkers in eight different AWS Regions. This is configurable...