amazon web services - Possible invalid domain records

Hi I am using an elastic loadbalancer from amazon.
The problem I am having is that I first had an A record for my domain which pointed to the IP of the loadbalancer.
This however only works for a short while because the ip of the loadbalancer is not static.
So to resolve this I removed the A record and added a CNAME record with name www.example.com and pointing to the DNS address of the loadbalancer.

The weird behavior I am getting however is that when I go to example.com sometimes it cant find a dns record. If I go to https://www.example.com or http://www.example.com it will resolve and when I then try example.com afterwards it also works for a while.

Does anyone of you know what might be causing this weird behavior and how to fix it ?

Regards,

Answer

When using an Amazon Load Balancer you also need to use ALIAS DNS records. You did not mention that you are using Route 53 but you will need to. You will need to use ALIAS records for the domain root (mydomain.com) and each subdomain (www.mydomain.com) that points to the load balancer.

This link explains how to setup ALIAS records for load balancers.

Routing Traffic to an ELB Load Balancer

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