====== AWS Information ======

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===== Route 53 =====

==== Inbound Endpoint ====

  * Forwards DNS queries to any zone from on-prem DNS (For example) (whether it is a Hosted Zone in your Account, another account in Publically) using the the Route 53 resolver.
  * These queries are passed back from the resolver back to the inbound endpoint and back to the on-prem DNS. The Internet resolver will resolve anything on the Internet.

==== Outbound Endpoint ====

  * Acts a a conditional forwarder for anything else that is defined as a resolver rule to other DNS Servers (Whether these be Hosted in AWS or elsewhere)

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===== RDS Custom =====

==== Overview ====

  * Custom patching - applied directly on instance
  * Custom high availability option
  * Managed instance - provides the automation - provisioning, monitoring, backup/restore. Custom allows to pause RDS to make customisations and resume automation
  * EC2 instance launch and EBS are in customer AWS Account. IAM also manageable
  * Apps and DB can be lifted and shifted to RDS Custom. DMS can be used to migrate. Or RDS Custom instance can be launched as a standby to the on-premise instance. Once replication between on-prem and RDS Custom is complete, it can be failed over to the RDS Custom instance. Close to zero downtime for failover

==== Benefits ====

  * RDS Custom allows to customise Host, O/S and DB for certain use cases. CAVEAT: RDS CUSTOMISATIONS CAN IMPACT RDS CUSTOM AUTOMATION. IF SO IT IS THE CUSTOMERS RESPONSIBILITY TO BACK OUT CUSTOMISATIONS THEY MADE OR IMPLEMENT IN A DIFFERENT WAY OR REVERT THEM ALTOGETHER.

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===== AWS Volume Gateway Modes =====

==== Cached Mode ====

  * Keeps primary data in S3 while caching frequently accessed data locally
  * Used as an extension of the onprem SAN Envionment where storage space could be limited
  * Still provides low latency access to data

==== Stored Mode ====

  * Keeps primary data locally while asynchronosly copying data to S3 (Used like an offsite backup of the Data)
  * Used for DR scenarios