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Zorluk: KolayRoute 53 DNS Failover

A SysOps administrator is setting up an active-passive failover configuration in Amazon Route 53. The primary resource record set points to an Application Load Balancer, and the secondary resource record set points to an Amazon S3 static website. What configuration is required on the primary resource record set to enable Route 53 to automatically redirect traffic to the secondary record during an outage?

  1. A
    A CloudWatch alarm configured for 1-minute detailed monitoring associated with a CloudWatch metric filter.
  2. A Route 53 health check that monitors the primary endpoint and has the DNS record's 'Evaluate Target Health' option set to Yes.Cevap
  3. C
    A Route 53 weighted routing policy with the primary record set to a weight of 0 and the secondary record set to a weight of 100.
  4. D
    An Amazon RDS Read Replica designated as the failover target within the Route 53 routing policy.

Cevap

A Route 53 health check that monitors the primary endpoint and has the DNS record's 'Evaluate Target Health' option set to Yes.
To set up active-passive failover, Amazon Route 53 needs a way to detect whether the primary resource is healthy. Associating a Route 53 health check with the primary resource record set and enabling 'Evaluate Target Health' ensures Route 53 regularly checks the health of the Application Load Balancer and redirects queries to the S3 bucket if the ALB becomes unhealthy.

Adım Adım Çözüm

1
Identify the primary and secondary endpoints in the active-passive failover configuration.
The primary endpoint is the Application Load Balancer, and the secondary endpoint is the Amazon S3 static website.
This establishes which resource should handle normal traffic and where traffic should flow if that resource becomes unhealthy.
2
Determine the mechanism Route 53 uses to dynamically detect endpoint failures.
Route 53 uses health checks associated with resource record sets to determine endpoint health.
Without an associated health check, Route 53 cannot determine whether a resource is healthy and will continue routing traffic to it indefinitely.
3
Identify the record setting that enables evaluation of the load balancer's target health.
Setting 'Evaluate Target Health' to Yes on the Alias record set points Route 53 to the health of the underlying load balancer targets.
This configuration integrates Route 53 directly with the ELB health checks, enabling faster failover.

Anahtar Kavram

Active-passive DNS failover in Amazon Route 53 requires associating a health check with the primary record, and for Alias records, configuring 'Evaluate Target Health' to Yes to track the endpoint availability.
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Route 53 DNS Failover

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