Amazon Route 53 is a highly available and scalable Domain Name System (DNS) web service. You can use Route 53 to perform three main functions in any combination: domain registration, DNS routing, and health checking.
- Records types:
- SOA records
- NS Records
- CNAME records
- A records
- Routing Policies:
- Simple routing: 1 record multiple IPs
- Weighted routing: % balance traffic
- Latency-Based routing: ms balance traffic
- Failover routing: Active/Passive failure traffic
- Geolocation routing: EU/US location traffic
- Geoproximity routing: used for traffic low
- Multivalue answer routing
Health Checks
- You can set health checks on individual record sets.
- If a record set fails a health check, it will be removed from Route 53 until it passes the health check.
- You can set SNS notifications to alert you about failed health checks.
A Record VS CNAME
The A record points a name to a specific IP. If you want blog.dnsimple.com to point to the server 185.31.17.133 you’ll configure:
blog.dnsimple.com. A 185.31.17.133
The CNAME record points a name to another name instead of to an IP. The CNAME source represents an alias for the target name and inherits its entire resolution chain.