SHASHI KANT SHAH: AWS Route53 Details

Route 53

· Route53 is a Managed DNS. (Domain name system)

· DNS is a collection of rule and records which helps clients understand how to reach a server through its domain name.

· In aws the most common records are:

1.A :- hostname to IPv4

2.AAAA :- hostname to IPv6

3.CNAME :- hostname to hostname

4.Alias :- hostname to AWS resource.

5.TTL :- time to live.

· Route53 can use:

Public domain you own (or buy).

Private domain names that can be resolved by your instances in your VPCs.

· Route53 has advanced features such as:

1.Load balancing (through DNS – also called client load balancing)

2.Health checks (although limited..)

3.Routing policy: simple, failover, geolocation, latency, weighted, multi value.

· You pay $0.50 per month per hosted zone.

CNAME vs Alias shortcut name.

	CNAME	Alias
1.	Only for Non Root Domain map.	Non Root domain and Root domain map.
2.	Eg :- <cname>.excample.com mapping to test.lb.com name.	Root domain mapping to alias name (alias name) (Root domain) jk.example.com mapping to lb.com Non Root mapping to alias name Jk1 alias name and test.lb.com is a non root. Jk1.example.com mapping to test.lb.com
3.	It is chargeable.	It is a free.
4.	Not health check	Native health check.