[AWS Architect] (12) Auto Scaling

Here is the confusing part. AWS provides multiple auto scaling services: notably ASW Auto Scaling and EC2 Auto Scaling.

  • AWS Auto Scaling lets you configure and manage scaling for your scalable AWS resources through a scaling plan.
  • EC2 Auto Scaling is an AWS service that automatically increases or decreases the number of on-demand instances based on chosen CloudWatch metrics.
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[AWS Architect] (10) CloudFront

Cloud Front is a Content Delivery Network (CDN) – lower latency, higher transfer speed, and reduced server load. It has built-in DDoS (distributed denial of service) attack protection.

  • CloudFront is a global service.
  • The domain name is created when a distribution is created and is used to view contents in a browser.
  • Objects are cached for the life of the Time to Live (TTL).
  • You can invalidate (clear) cached contents manually with some costs.
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[AWS Architect] (9) Route 53

Route 53 configures and manages domains: domain registration, DNS (Domain Name System) service, and health checking. – DNS uses port 53. That is how the name comes from.

  • Route 53 is commonly used with ELB (Elastic Load Balancer) and CloudFront.
  • Split-View DNS option (Hosted zones) allows maintaining both a private and a public hosted zone with the same domain name.
    • The private hosted zones are allowed with VPCs. Associated VPCs can see the interval version of a website by using the private zone’s A record.
    • A public hosted zone holds the information about how to route the public domain name. The host (www) portion is not included in a public zone’s naming convention.
  • In Route 53, the TTL (Time to Live) is the amount of time that the DNS resolver will cache the record.
  • When creating an A record, you need to specify TTL, a routing policy, and IP values.
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[AWS Architect] (8) DNS

Domain Name System (DNS)

DNS is a process of mapping a human-friendly domain name to an IP address.

  • DNS Root Servers: A group of servers to answer the root zone. Top Level Domains (TLDs) are controlled by the root zone database – Internet Assigned Numbers Authority (IANA).
  • Domain Registrars: All domain names must be unique. A registrar is an authority that can assign domain names to top-level domains and ensure its uniqueness. Each domain name becomes registered in a central database (WhoIS server).
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