Installing PostgreSQL on CentOS 7

PostgreSQL is a powerful, open-source object-relational database management system. It is known for its reliability, scalability, and extensive features, making it a popular choice for many organizations and developers.

To install PostgreSQL on CentOS 7, follow the steps below:

Step 1: Enable the PostgreSQL Repository

CentOS 7 does not include PostgreSQL in its default repositories, so we need to enable the PostgreSQL repository using the yum package manager.

  sudo yum install https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm  

Step 2: Install PostgreSQL

After enabling the PostgreSQL repository, we can proceed with the installation.

  sudo yum install postgresql-server  

Step 3: Initialize and Start PostgreSQL

Once the installation is complete, we need to initialize the database and start the PostgreSQL service.

  sudo postgresql-setup initdb sudo systemctl start postgresql sudo systemctl enable postgresql  

Step 4: Set a Password for the PostgreSQL User

Next, we need to set a password for the default PostgreSQL user called "postgres".

  sudo passwd postgres  

Step 5: Access the PostgreSQL Command Line

To access the PostgreSQL command line, switch to the "postgres" user and run the "psql" command.

  sudo su - postgres psql  

Step 6: Creating a Database and User

Now, you can create databases and users as needed using SQL commands.

  CREATE DATABASE mydatabase; CREATE USER myuser WITH ENCRYPTED PASSWORD 'mypassword'; GRANT ALL PRIVILEGES ON DATABASE mydatabase TO myuser;  

That's it! You have successfully installed PostgreSQL on CentOS 7 and created a database and user. You can now start using PostgreSQL for your applications.