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DNS Route53

DNS

Convert domains names into routable IP addresses

  • Domain Registra 3rd party copany who you register domains though
  • Name Server is the server which contains the DNS records for a domain
  • Start of Authority (SOA) contains information about the DNS zone and associated DNS records ????
  • A record convert a domain directly to IP record
  • CNAME record convert domain name to another
  • Time to Live (TTL) the time that DNS record will be cached for, the lower means changes propagates faster

Route53

Route53 is a DNS provider, register and mange domains, create record sets. Think Godaddy or NameCheap

  • Traffic Flow: visual editor for changing routing policies, can version policy records for easy rollback
  • AWS Alias Record - AWS' smart DNS records: detects changed IPs for AWS resources and adjusts automatically
  • Route53 Resolver: lets you regionally route DNS queries between your VPCs and your network Hybrid Environments
  • Health checks can be created to monitor and automatically over endpoints, You can have health checks monitor other health checks

Routing policies

  • Simple: Default, multiple addresses result in a random endpoint selection
  • Weighted: split based on assigned weights
  • Latency-based: Based on region, direct to the lowest latency for users, not neccessarly the closest region
  • Failover: direct trafic to a secondary site if the health of the primary is not good
  • Geolocoation: based on geographic location of request origin
  • Geo-proxmity: based on geographic location using Bias values (needs Route53 Traffic Flow)
  • Multi-Value Answer: just like Simple but uses health check for selection