How To Install PostgreSQL on CentOS 7

In this tutorial, we will show you how to install PostgreSQL on CentOS 7. For those of you who didn’t know, PostgreSQL is a free, open-source object-relational database management system (object-RDBMS), similar to MySQL, and is standards-compliant and extensible. It is commonly used as a back-end for web and mobile applications. PostgreSQL, or ‘Postgres’ as it is nicknamed, adopts the ANSI/ISO SQL standards together, with the revisions. The vast majority of Linux distributions have PostgreSQL available in supplied packages.

This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple. I will show you the step-by-step installation of PostgreSQL in the CentOS 7 server.

Prerequisites

• A server running one of the following operating systems: CentOS 7.
• It’s recommended that you use a fresh OS install to prevent any potential issues.
• SSH access to the server (or just open Terminal if you’re on a desktop).
• A non-root sudo user or access to the root user. We recommend acting as a non-root sudo user, however, as you can harm your system if you’re not careful when acting as the root.

Install PostgreSQL on CentOS 7

Step 1. First, add the PostgreSQL Yum repository to your system.

rpm -Uvh http://yum.postgresql.org/9.4/redhat/rhel-7-x86_64/pgdg-centos94-9.4-1.noarch.rpm

Step 2. Install PostgreSQL on CentOS 7.

yum -y install postgresql94 postgresql94-server postgresql94-contrib

Once the postgresql94-server package is installed, you need to initialize a database:

/usr/pgsql-9.4/bin/postgresql94-setup initdb

Step 3. Start the PostgreSQL server.

systemctl start postgresql-9.4
systemctl enable postgresql-9.4

Step 4. Configure Iptables or firewall.

Adjust iptables to access PostgreSQL from remote systems:

#nano /etc/sysconfig/iptables

firewall-cmd --permanent --add-port=5432/tcp
firewall-cmd --permanent --add-port=80/tcp
firewall-cmd --reload

Step 5. Create a test database and Create a new user PostgreSQL.

Once the installation is completed, you can start using PostgreSQL 9.4 on your CentOS 7 by typing the commands:

su - postgres
psql

Create a test database (as postgres user).

createdb idroot

Login test database (as postgres user).

psql idroot

Delete database (as postgres user).

su - postgres
dropdb <database-name>

Congratulations! You have successfully installed the PostgreSQL Server. Thanks for using this tutorial for installing PostgreSQL on CentOS 7 systems. For additional help or useful information, we recommend you check the official PostgreSQL website.