How to install PostgreSQL Rocky Linux? [SOLVED]


Written By - Omer Cakmak
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What is PostgreSQL?

PostgreSQL is an open source (BSD license), enterprise-grade, advanced object-relational database system that supports both relational (SQL) and non-relational (JSON) querying.

Answer to "Why PostgreSQL" question:

  • It is free and open source.
  • PostgreSQL is not affiliated with any company and is open to all developers. Anyone who needs it can customize and use PostgreSQL to meet their needs.
  • PostgreSQL has an extensible structure.
  • You can define your own data types without recompiling your database.
  • You can create custom functions and even code from different programming languages.
  • It has flexible full-text search feature. The full-text search feature can be used when searching for sequences that execute vector operations and sequence searches.
  • It can be used in all server environments thanks to the SQL functions called Store Procedure.
  • PostgreSQL conforms to at least 170 of the 179 mandatory attributes for SQL:2016 Core compatibility.

In this article, we will describe the installation of this popular database on Rocky Linux 9.

 

How to install Postgresql?

We will explain the installation in 2 different ways. We will first install it from the Rocky Linux repository, then from the official PostgreSQL repository.

 

Method-1: Install From Repository

In this step install the postgresql-server package from the repository:

[foc@rocky9 ~]$ sudo dnf install postgresql-server.x86_64
Rocky Linux 9 - BaseOS                  3.8 kB/s | 3.6 kB     00:00    
Rocky Linux 9 - BaseOS                  962 kB/s | 1.7 MB     00:01    
Rocky Linux 9 - AppStream               7.7 kB/s | 4.1 kB     00:00    
Rocky Linux 9 - AppStream               2.3 MB/s | 6.4 MB     00:02    
Rocky Linux 9 - Extras                  5.6 kB/s | 2.9 kB     00:00    
Rocky Linux 9 - Extras                   10 kB/s | 7.7 kB     00:00    
Dependencies resolved.
...

Installed:
  libicu-67.1-9.el9.x86_64                                              
  postgresql-13.7-1.el9_0.x86_64                                        
  postgresql-private-libs-13.7-1.el9_0.x86_64                           
  postgresql-server-13.7-1.el9_0.x86_64                                 

Complete!

PostgreSQL server version available in the repository:

[foc@rocky9 ~]$ postgres --version
postgres (PostgreSQL) 13.7

Create a new PostgreSQL database cluster:

[foc@rocky9 ~]$ sudo /usr/bin/postgresql-setup --initdb
 * Initializing database in '/var/lib/pgsql/data'
 * Initialized, logs are in /var/lib/pgsql/initdb_postgresql.log

Note: If you get an error like the one below, it means you didn't follow the above step.

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Directory "/var/lib/pgsql/data" is missing or empty

Now enable and start the service:

[foc@rocky9 ~]$ sudo systemctl enable --now postgresql

Status of the service:

● postgresql.service - PostgreSQL database server
     Loaded: loaded (/usr/lib/systemd/system/postgresql.service; enabled; ven>
     Active: active (running) since Thu 2023-01-05 20:42:19 +03; 55s ago
    Process: 11315 ExecStartPre=/usr/libexec/postgresql-check-db-dir postgres>
   Main PID: 11317 (postmaster)
      Tasks: 8 (limit: 9122)
     Memory: 16.8M
        CPU: 44ms
     CGroup: /system.slice/postgresql.service
...

Switch to postgres user:

[foc@rocky9 ~]$ sudo -u postgres -i

Finally, login to the postgresql server with psql:

[postgres@rocky9 ~]$ psql
psql (13.7)
Type "help" for help.

postgres=#

Installation completed successfully.

 

Method-2: Install from PostgreSQL Repository

Install the RPM package that will add the repository:

[foc@rocky9 ~]$ sudo dnf install -y https://download.postgresql.org/pub/repos/yum/reporpms/EL-9-x86_64/pgdg-redhat-repo-latest.noarch.rpm
[sudo] password for foc: 
Rocky Linux 9 - BaseOS                  1.1 MB/s | 1.7 MB     00:01    
Rocky Linux 9 - AppStream               2.3 MB/s | 6.4 MB     00:02    
Rocky Linux 9 - Extras                   10 kB/s | 7.7 kB     00:00    
pgdg-redhat-repo-latest.noarch.rpm       19 kB/s |  12 kB     00:00    
Dependencies resolved.
========================================================================
 Package               Arch        Version      Repository         Size
========================================================================
Installing:
 pgdg-redhat-repo      noarch      42.0-28      @commandline       12 k

Transaction Summary
========================================================================
Install  1 Package

Total size: 12 k
Installed size: 14 k
...
Transaction test succeeded.
Running transaction
  Preparing        :                                                1/1 
  Installing       : pgdg-redhat-repo-42.0-28.noarch                1/1 
  Verifying        : pgdg-redhat-repo-42.0-28.noarch                1/1 

Installed:
  pgdg-redhat-repo-42.0-28.noarch                                       

Complete!

Then disable the built-in PostgreSQL module:

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[foc@rocky9 ~]$ sudo dnf -qy module disable postgresql

Install PostgreSQL:

[foc@rocky9 ~]$ sudo dnf install -y postgresql15-server.x86_64

Create a new PostgreSQL database cluster:

[foc@rocky9 ~]$ sudo /usr/pgsql-15/bin/postgresql-15-setup initdb
Initializing database ... OK

Initialize the database and enable automatic start:

[foc@rocky9 ~]$ sudo systemctl enable --now postgresql-15
Created symlink /etc/systemd/system/multi-user.target.wants/postgresql-15.service → /usr/lib/systemd/system/postgresql-15.service.

postgresql-15 service status:

[foc@rocky9 ~]$ sudo systemctl status postgresql-15
● postgresql-15.service - PostgreSQL 15 database server
     Loaded: loaded (/usr/lib/systemd/system/postgresql-15.service; ena>
     Active: active (running) since Thu 2022-12-29 22:33:42 +03; 14s ago
       Docs: https://www.postgresql.org/docs/15/static/
    Process: 2480 ExecStartPre=/usr/pgsql-15/bin/postgresql-15-check-db>
   Main PID: 2485 (postmaster)
      Tasks: 7 (limit: 9122)
     Memory: 17.5M
        CPU: 29ms
     CGroup: /system.slice/postgresql-15.service
             ├─2485 /usr/pgsql-15/bin/postmaster -D /var/lib/pgsql/15/d>
             ├─2486 "postgres: logger "
...

After installation, executable postgresql files can be run from /usr/pgsql-15/bin/ directory. Installed postgresql version:

[foc@rocky9 ~]$ /usr/pgsql-15/bin/postgres --version
postgres (PostgreSQL) 15.1

Successfully installed version 15 from the PostgreSQL repository.

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Switch to postgres user:

[foc@rocky9 ~]$ sudo -u postgres -i

Then login to posgtresql server:

[postgres@rocky9 ~]$ /usr/pgsql-15/bin/psql
psql (15.1)
Type "help" for help.

postgres=#

 

Summary

Different versions are available at the PostgreSQL official address. After adding the official repository to the system, you can install the version you want from v10 to v15.

PostgreSQL 16 is released in alpha, so installation is not recommended. When it is stable, it will be installed in the official repository.

We installed with 2 different versions. The choice is yours. If there is no reason, installing from the official Rocky repository is recommended.

 

References

www.postgresql.org - Linux downloads (Red Hat family)

 

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