Route 53 Fundamentals

  • Managed DNS
  • Also work as a Domain Registerer

  • Records

  • A hostname to IPv4

  • AAAA hostname to IPv6
  • CNAME hostname to hostname

  • Alias hostname to AWS resource

  • Health Check

  • Active-Active Failover
    • All resources should be available all the time
    • All records should be
    • Same name
    • Same Records
    • Same Routing Policy
  • Active-Passive Failover
    • Primary Resource available all the time
    • In case of Failover, Secondary Resource always in standby
  • Support
  • A (Address Record)
  • AAAA (IP V6 address record)
  • CNAME (Canonical name record)
  • CAA (Certification Authority Authorization)
  • MX (Mail Exchange Record)
  • NAPTR (name Authority Pointer Record)
  • NS (Name Server record)
  • SoA (Start of authority record)
  • SPF (Sender Policy Framework)
  • SRV (Service locator)
  • TXT (Text Record)

  • Not Supported

  • DNSSEC

### TTL

  • Stands for Time To Live
  • Default value is 300 sec
  • During this time the browser does not make the request to DNS server for IP
  • When TTL is High
    • The server make less query to the DNS server
    • DNS server has low traffic
    • To change IP, need to wait long time
  • When TTL is low
    • DNS server make DNS query more frequently
    • Easy to change the IP

CNAME vs Alias

  • CNAME
  • Points hostname to hostname
  • Only works for non-root domain
  • Alias
  • Points to AWS Resource
  • Works for both root and non-root domain
  • Alias records is a AWS feature for its resources

Routing Policy

  • Simple Routing Policy
  • Send traffic randomly to the resources
  • Weighted Routing Policy
  • Send traffic multiple resource with specified percentage
  • Latency Based Routing Policy
  • Send traffic to the resource that has lowest latency
  • Failover Routing Policy
  • Active passive failover (Check the upper section)
  • Geo location Routing Policy
  • Send traffic based on users location
  • Geo Proximity Routing Policy
  • Send traffic based on resource location
  • Multi-value Routing Policy
  • Simple routing policy with health check

3rd Party Domains

  • To import 3rd party domain to Route 53
  • Create a hosted zone in Route53
  • Update NS record on 3rd party website to use Route53