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:
- Simple routing
- Weighted round robin
- Latency-based routing
- Health check and DNS failover
- Geo-location routing
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