I was going through the documentation and couldn't find very specific details related to support.
Any input will be much helpful.
You'll be able to :
- compile PostgreSQL
- download and install rpm packages by hand
- use a Amazon provided repo that installs more recent Postgres versions - actually not up-to-date.
After struggling with the points above I decided just to use CentOS on EC2. It works perfectly and from CentOS 7 and up it is supported by AWS on all instance types and their exquisite hardware like network interfaces for EBS performance.