Install Postgres

If you have already installed a MySQL database, you may skip these steps.

	Note
	You must install Postgres 9.5 or later for SAM and Schema Registry. Ambari does not install Postgres 9.5, so you must perform a manual Postgres installation.

Install Red Hat Package Manager (RPM) according to the requirements of your operating system:
```
yum install https://yum.postgresql.org/9.6/redhat/rhel-7-x86_64/pgdg-redhat96-9.6-3.noarch.rpm
```

Install Postgres version 9.5 or later:

yum install postgresql96-server postgresql96-contrib postgresql96

Initialize the database:
For CentOS 7, use the following syntax:
```
/usr/pgsql-9.6/bin/postgresql96-setup initdb
```

Start Postgres.

For example, if you are using CentOS 7, use the following syntax:

systemctl enable postgresql-9.6.service
systemctl start postgresql-9.6.service