You want to install Postgres on Linux SUSE. This AWS server is in a security group with the ability to get to the Internet. How do you install PostgreSQL on it?
1. Log into the SUSE server with the default ec2-user. The default user for AWS SUSE instances used to be root. But now it is ec2-user.
2. Run these five commands (taken from https://wiki.postgresql.org/wiki/Zypper_Installation):
zypper addrepo -t YUM http://packages.2ndquadrant.com/postgresql-z-suse/zypper/sles-11sp3-s390x pg
zypper addrepo -t YUM http://packages.2ndquadrant.com/postgresql-z-suse/zypper/sles-11sp3 pgsrc
zypper install postgresql94-server
3. Now you are ready to start the Postgres service. Run this command:
/sbin/service postgresql start
4. You are done. For future knowledge, AWS security group rules have a "PostgreSQL" type that allow connections to servers over port 5432. If you are configuring a SQL front end from a Windows desktop to your SUSE instance, this rule in your security group is necessary.