Route53

• Domain/subdomain
• Record type (A, AAAA, CNAME, NS)
  • A: IPv4
  • AAAA: IPv6
  • CNAME: Canonical name. cant be used for root domain
  • NS: Name server (another DNS server)
  • alias: Route53 specific. can be used for root domain. free. health check. no TTL, can’t be used for ec2 instance
• Value
• Routing policy
  • Simple: one record with multiple values, choose randomly by client, no health check, if alias then specify only one
  • Weighted: split traffic based on weight
  • Latency based: split traffic based on latency
  • Failover: primary and secondary
  • Geolocation
  • Multivalue answer: multiple values, health check, choose randomly by client
  • Geo-proximity
• TTL

health check

• Endpoint
• Calculated
• CloudWatch alarm