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Route 53

Route 53​

  • Global Service
  • AWS managed Authoritative DNS (customer can update the DNS records and have full control over the DNS)
  • Also a Domain Registrar (for registering domain names)
  • Only AWS service which provides 100% availability SLA
  • Affected by client's DNS caching (not suitable for Blue-Green Deployment if the client caches DNS queries)
note

It is recommended to use DNS names or URLs instead of IPs wherever possible

Hosted Zone​

  • A container for DNS records that define how to route traffic to a domain and its subdomains.
  • Hosted zone is queried to get the IP address from the hostname
  • Two types:
    • Public Hosted Zone
      • resolves public domain names
      • can be queried by anyone on the internet
    • Private Hosted Zone
      • resolves private domain names
      • can only be queried from within the VPC

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
    • Cannot point to root domains (Zone Apex) Ex: you can’t create a CNAME record for example.com, but you can create for something.example.com
  • NS(Name Server) - controls how traffic is routed for a domain
  • Alias - maps a hostname to an AWS resource

    • AWS proprietary

    • Can point to root (zone apex) and non-root domains

    • Alias Record is of type A or AAAA (IPv4 / IPv6)

    • Targets can be

      • Elastic Load Balancers
      • CloudFront Distributions
      • API Gateway
      • Elastic Beanstalk environments
      • S3 Websites
      • VPC Interface Endpoints
      • Global Accelerator accelerator
      • Route 53 record in the same hosted zone

    • Target cannot be EC2