[AWS] 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] 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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Issue – Smart Consumption

Every year in North America, there are a couple of occasions when we can have huge discounts for almost everything. Black Friday sales or Boxing days are well known. One of the chances is the Amazon prime day sales (10/13 – 10/14 in 2020). Even weeks before the event, we were bombarded by the advertisement from Amazon and shopping guides from all types of media.

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[AWS] VPC – Subnets and Routing Tables

Subnets are the logic network that you group your resources in a single local network. Communication in and out of a subnet is of critical importance, and a routing table contains the rules on how traffic can be directed.

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