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10. routing.md

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Routing

Đà Nẵng, năm COVID thứ 2

Elastic Load Balancer (ELB):

ELB Load Balancer types in AWS:

  • Application LB (ALB or ELBv2)
  • Classic LB (ELBv1)
  • Network NLB
  • Gateway LB

Route 53:

  • Worldwide distributed DNS with 100% SLA.
  • Is also a registrar for your domain name.
  • Has an API.
  • Can do server health checks.
  • Two types of zones:
    • Public hosted zone: visible on internet.
    • Private hosted zone: used only from within your VPCs. You need to enable « DNS Resolution » and « DNS Hostnames » on the VPC.
  • Refer to the VPC notes for more information about private hosted zones.
  • You can associate any DNS record type except SOA and NS records.

DNS standard record types:

  • A: IPv4 address for a DNS name.
  • AAAA: IPv6 address for a DNS name.
  • CNAME: Alias (Canonical name)
  • MX: email
  • TXT
  • SRV
  • SPF: Sender Policy Framework: IP address of email gateway to avoid spoofing.
  • NS: name server record.
  • SOA: Start of authority.

Route 53 Routing Policies:

  • Simple routing policy:
    • Associates an A record with one or more IP addresses.
    • You can't use multiple records of the same name and type with simple routing.
    • However, a single record can contain multiple values (such as IP addresses).
    • In case of multiple IP addresses, the list is returned in a random order.
  • Failover routing policy:
    • Active-passive failover between a primary record and a secondary record.
    • Both can be single or multiple records.
    • Route 53 does NOT respond to DNS queries using the secondary record until ALL primary records are unhealthy.
    • A popular scenario for web sites is to have a failover policy to a static web site in S3.
  • Geolocation routing policy:
    • Based on the location of your users: by continent, by country or by state (the latter for US only).
    • Does not necessarily mean the best latency.
  • Geoproximity routing policy – Based also on the location of your users. Uses a geoproximity map that you can alter.
  • Latency routing policy:
    • Based on latency between the user and the AWS data centers.
    • AWS maintains a database of latencies from different parts of the world.
  • Multivalue answer routing policy – Responds to DNS queries with up to eight healthy records selected at random.
  • Weighted routing policy – Use to route traffic to multiple resources in proportions that you specify.

AWS CloudFront