AWS

Disaster Recovery & Migrations

Cập nhật 23/06/2026

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  • #dr

Disaster Recovery & Migrations

Maarek SAA-C03 Slides v45 — Chapter 26. Personal study extract.

Key content

  • Routing Policies – Failover (Active-Passive)
  • EC2 Instance
  • (Primary) Health Check
  • (mandatory)
  • Failover
  • Client
  • Amazon
  • Route 53
  • EC2 Instance
  • (Secondary – Disaster Recovery)
  • DNS Requests
  • Routing Policies – Geolocation
  • or by US State (if there's overlapping,
  • most precise location selected)
  • case there's no match on location)
  • content distribution, load balancing, …
  • A 11.22.33.44
  • A 55.66.77.88
  • Default
  • A 99.11.22.33
  • Routing Policies – Geoproximity
  • resources
  • Routing Policies – Geoproximity
  • us-east-1 us-west-1
  • Bias: 0 Bias: 0
  • Routing Policies – Geoproximity
  • us-east-1 us-west-1
  • Bias: 0 Bias: 50
  • Higher bias in us-east-1
  • Routing Policies – IP-based Routing
  • and the corresponding endpoints/locations
  • (user-IP-to-endpoint mappings)
  • network costs…
  • ISP to a specific endpoint
  • Locations CIDR blocks
  • location-1 203.0.113.0/24
  • location-2 200.5.4.0/24
  • CIDR Collection
  • Route 53
  • Record Name Value IP-based
  • example.com 1.2.3.4 location-1
  • example.com 5.6.7.8 location-2
  • Records
  • EC2 Instance
  • (1.2.3.4)
  • EC2 Instance
  • (5.6.7.8)
  • User A
  • (203.0.113.56)
  • User B
  • (200.5.4.100)
  • Routing Policies – Multi-Value
  • Domain Registar vs. DNS Service
  • paying annual charges (e.g., GoDaddy, Amazon Registrar Inc., …)
  • your DNS records
  • your DNS records
  • Amazon
  • Route 53
  • purchase
  • example.com
  • User
  • manage DNS records
  • GoDaddy as Registrar & Route 53 as DNS Service
  • Amazon
  • Route 53
  • Public Hosted Zone
  • stephanetheteacher.com
  • 3rd Party Registrar with Amazon Route 53
  • Route 53 as the DNS Service provider
    1. Create a Hosted Zone in Route 53
    1. Update NS Records on 3rd party website to use Route 53 Name
  • Servers
  • Route 53 – Hybrid DNS
  • automatically answers DNS queries for:
  • between VPC (Route 53 Resolver) and
  • your networks (other DNS Resolvers)
  • Direct Connect or AWS VPN)
  • VPC
  • Region
  • EC2 Instance
  • (ec2-192-0-2-44.compute-1.amazonaws.com)
  • Private Hosted Zone
  • Route 53
  • Resolver
  • Public Name Server
  • Route 53 – Resolver Endpoints
  • for AWS resources (e.g., EC2 instances) and records in Private Hosted Zones
  • Private Subnet
  • VPC
  • us-east-1 On-Premises Data Center
  • DNS Resolvers
  • (onpremise.private)
  • Server
  • (web.onpremise.private)
  • Resolver
  • Inbound Endpoint
  • Route 53
  • Resolver
  • Private Hosted Zone
  • (aws.private)
  • EC2 Instance
  • (app.aws.private) DNS Query
  • app.aws.private?
  • DNS Query
  • app.aws.private?
  • VPN or DX connection
  • lookup
  • Route 53 – Resolver Endpoints
  • Private Subnet
  • VPC
  • us-east-1 On-Premises Data Center
  • DNS Resolvers
  • (onpremise.private)
  • Server
  • (web.onpremise.private)
  • Resolver
  • Outbound Endpoint
  • Route 53
  • Resolver
  • Private Hosted Zone
  • (aws.private)
  • EC2 Instance
  • (app.aws.private)
  • DNS Query
  • web.onpremise.private?
  • VPN or DX connection
  • DNS Query
  • web.onpremise.private?

Study checklist