Health Checks
Health checks are a feature of Route 53 that helps monitor the health and availability of resources by continuously sending automated requests to their endpoints. Route 53 can perform health checks on various types of endpoints, including web servers, mail servers, and other AWS resources. If a health check failure is detected, Route 53 can automatically redirect traffic to healthy resources, reducing downtime and ensuring the availability of services. Users can configure health check intervals, failure thresholds, and notification settings to stay informed of their resources' status and quickly respond to potential issues.
Guide: Amazon Route 53 - Health Checks
What is Amazon Route 53 Health Check?
Amazon Route 53 Health Check is a feature that checks and monitors the health of your resources such as web servers and email servers. If the health check status of a resource changes (i.e., if the condition specified in a health check evaluation fails), Amazon Route 53 initiates necessary actions such as rerouting traffic.
Why is it important?
It can help you achieve higher availability and improved load balancing by enabling Amazon Route 53 to reroute traffic away from unhealthy resources.
How it works?
Health Checks works by sending requests to the resource at a specified interval. If the resource does not respond in a timely manner, or the health check fails, Route 53 considers the resource 'unhealthy' and redirects network traffic.
Exam Tips: Answering Questions on Health Checks
It is essential to understand the different types of Health Checks (Basic and Advanced), and how they work. You should know how Failure Threshold (the number of times the health check must fail before the resource is marked 'unhealthy') affects the evaluation of resource health and how fast health changes are propagated through Route 53.
To tackle questions around Health Checks, remember to:
1) Familiarise with how health check works (i.e., know when AWS considers a resource 'healthy' or 'unhealthy').
2) Understand the role of health checks in DNS routing policies.
3) Know how to set up and configure a health check in Amazon Route 53.
Lastly, don't forget practice questions in this area as they often appear in the AWS Certified Solutions Architect - Associate exam.
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