How to build a Highly Available environment on AWS

There are few important things to take care regarding High Availability.

• Always, run your instances in 2 Availability Zone (that's minimum)
• if you want 99.99% availability, then 2 AZ with in a region is enough. 
• For 99.999% availability, AWS recommends implementing your infrastructure in 2 regions. 

We have talked about the usage of Route53 in detail in the following video.

Route53 supports 5 types of routing:

1. Simple routing 
2. Weighted round robin 
3. Latency-based routing 
4. Health check and DNS failover 
5. Geo-location routing