Route 53 Overview¶

• The Amazon Route 53 is a highly available, scalable, fully managed and authoritative DNS.
  • The authoritative means that the customer (you) can update the DNS records.
• Route 53 is also a Domain Registrar so you can register your domain names there as well.
• Provides an ability to check the health of your resources
• The only AWS service which provides 100% availability SLA (service level agreement)

Route 53 - Records¶

• How you want to route traffic for a domain
• Each record contains:
  • Domain/subdomain name - e.g. example.com
  • Record Type - e.g. A or AAAA
  • Value - e.g. 12.34.56.78
  • Routing Policy - how Route 53 responds to queries
  • TTL - amount of time the record is cached at resolvers
• Route 53 supports the following DNS record types
  • (must know) A / AAAA / CNAME / NS
  • (advanced) CAA / DS / MX / NAPTR / PTR / SOA / TXT / SPF / SRV

Route 53 - Record Types¶

• A - maps a hostname to IPv4
• AAAA - maps a hostname to IPv6
• CNAME - maps a hostname to another hostname
  • The target is a domain name which must have an A or AAAA record
  • Can't create a CNAME record for the top node of a DNS namespace (Zone Apex)
    • Example: you can't create one for example.com but you can create for www.example.com
• NS - Name Servers for the Hosted Zone
  • Control how traffic is routed for a domain

Route 53 - Hosted Zones¶

• A container for records that define how to route traffic to a domain and its subdomains

  • Public Hosted Zones - contains records that specify how to route traffic on the internet (public domain names)
    • application1.mypublicdomain.com
  • Private Hosted Zones - contain records that specify how you route traffic within one or more VPCs (private domain names)
    • aplication1.comany.internal

• You pay $0.50 per month per hosted zone