An ALB runs in each Region.
If the primary ALB is unhealthy, DNS should answer with the secondary Region's ALB.
Choose TWO appropriate components.
Combine a Route 53 health check with failover routing so DNS selects the secondary ALB when the primary is unhealthy.
Detailed explanation
An embedded address bypasses DNS failover and requires a manual application change.
An embedded address bypasses DNS failover and requires a manual application change.
S3 Lifecycle manages objects and does not perform DNS endpoint failover.
S3 Lifecycle manages objects and does not perform DNS endpoint failover.
A health check can determine whether the primary endpoint is reachable and healthy.
A health check can determine whether the primary endpoint is reachable and healthy.
Failover routing returns the secondary endpoint when the primary health check fails.
Failover routing returns the secondary endpoint when the primary health check fails.
Check official documentation
Compare the following points with the official documentation.
Route 53 health checkとfailover routingの公式説明を確認する。
What to confirm
ヘルス判定とDNS応答切り替えを組み合わせられる。
Key points
- Route 53 health check
- Failover routing
- Application Load Balancer
Notes
- Environment: AWS公式Route 53・ELBドキュメントの確認
- Confirm current AWS service behavior in the official documentation.
Foundation review
Detection and action
The health check detects the failure while failover routing changes the DNS answer.
DNS-based recovery
Clients must honor DNS resolution so the secondary endpoint can be reached after failover.