How To Install PostgreSQL on CentOS 8

Install PostgreSQL on CentOS 8

In this tutorial we will show you how to install PostgreSQL on CentOS 8. For those of you who didn’t know, PostgreSQL or Postgres is an open source relational database management system. It is a popular and has many advanced features like reliable transactions and concurrency without read locks.

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 and assumes you are running in the root account, if not you may need to add ‘sudo’ to the commands to get root privileges. I will show you through the step by step install PostgreSQL on CentOS 8 server.

Install PostgreSQL on CentOS 8

Step 1. First let’s start by ensuring your system is up-to-date.

sudo dnf clean all
sudo dnf update

Step 2. Install PostgreSQL on CentOS.

PostgreSQL is available in the default repositories. Now, Install PostgreSQL packages using following command:

sudo dnf install @postgresql:10
sudo dnf install postgresql-contrib

Once the installation is complete, the PostgreSQL installation will not be enabled for automatic start or have the database initialized automatically. To make your database installation complete, you need to perform the following steps:

sudo postgresql-setup initdb

Start the PostgreSQL service and enable it to start on boot:

sudo systemctl enable --now postgresql

You can verify installation using below command:

$ sudo -u postgres psql -c "SELECT version();"
PostgreSQL 10.6 on x86_64-redhat-linux-gnu, compiled by gcc (GCC) 8.2.1 2019118 (Red Hat 8.2.1-3), 64-bit

Step 3. Accessing PostgreSQL command prompt.

After installing PostgreSQL database server, by default it creates a user ‘postgres’ with role ‘postgres’. It also creates a system account with same name ‘postgres’. So to connect to postgres server, login to your system as user postgres and connect database:

su - postgres
psql

Now you are logged in to PostgreSQL database server. To check login info use following command from database command prompt:

postgres-# \conninfo

To disconnect from PostgreSQL database command prompt just type below command and press enter. It will return you back to Ubuntu command prompt:

postgres-# \q

Create new user and database:

### For example, let us create a new user called “mailana” with password “meilanamaria”, and database called “meilanadb”. ###
sudo -u postgres createuser -D -A -P meilana
sudo -u postgres createdb -O mailana meilanadb

Congratulation’s! You have successfully installed PostgreSQL. Thanks for using this tutorial for installing PostgreSQL on CentOS 8 systems. For additional help or useful information, we recommend you to check the official PostgreSQL website.

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