How To Install PostgreSQL 11 / 10 on Debian 9 & Debian 8

2

PostgreSQL (simply known as Postgres) is an object-relational database management system (ORDBMS), available for many platforms including Linux, Microsoft Windows, FreeBSD, HP-UX, AIX, Solaris, and Mac OS.

PostgreSQL is released under the PostgreSQL License, a free and open source permissive software license, developed by the PGDG (PostgreSQL Global Development Group), a group of individual volunteers and corporate companies.

In this post, we will go through the installation of PostgreSQL 11 / 10 on Debian 9 / Debian 8.

Add PostgreSQL repository

PostgreSQL publishes deb packages for Debian based platforms, and their packages are fresher than those available in OS base repository.

Import the PostgreSQL signing key.

wget -q https://www.postgresql.org/media/keys/ACCC4CF8.asc -O- | sudo apt-key add -

Add the PostgreSQL repository information to /etc/apt/sources.list.d/postgresql.list file.

### Debian 9 ### 

echo "deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main" | sudo tee /etc/apt/sources.list.d/postgresql.list

### Debian 8 ### 

echo "deb http://apt.postgresql.org/pub/repos/apt/ jessie-pgdg main" | sudo tee /etc/apt/sources.list.d/postgresql.list

Install PostgreSQL

Once you have added the PostgreSQL repository run the following command to update the repository index.

sudo apt-get update

Install PostgreSQL using apt-get command.

### PostgreSQL 11 ###

sudo apt install -y postgresql-11

### PostgreSQL 10 ###

sudo apt install -y postgresql-10

Control PostgreSQL service

To start PostgreSQL service, run:

sudo systemctl start postgresql

To stop PostgreSQL service, run:

sudo systemctl stop postgresql

To restart PostgreSQL service, run:

sudo systemctl restart postgresql

To check the status of PostgreSQL service, run:

sudo systemctl status postgresql

Output:

 postgresql.service - PostgreSQL RDBMS
   Loaded: loaded (/lib/systemd/system/postgresql.service; enabled; vendor preset: enabled)
   Active: active (exited) since Sat 2019-02-23 01:49:54 EST; 23s ago
 Main PID: 2586 (code=exited, status=0/SUCCESS)
   CGroup: /system.slice/postgresql.service

Feb 23 01:49:54 server systemd[1]: Starting PostgreSQL RDBMS...
Feb 23 01:49:54 server systemd[1]: Started PostgreSQL RDBMS.

Configure PostgreSQL Server

PostgreSQL listens on loopback adapter (127.0.0.1) only. Sometimes the application hosted on external may need to connect to the database. For that, we need to configure PostgreSQL to listen on all adaptors.

### PostgreSQL 11 ###

sudo nano /etc/postgresql/11/main/postgresql.conf

### PostgreSQL 10 ###

sudo nano /etc/postgresql/10/main/postgresql.conf

Set the listen_addresses to * or <IPAddress>.

listen_addresses = '*'

Restart PostgreSQL service.

sudo systemctl restart postgresql

Confirm the PostgreSQL listening on port 5432 using netstat command.

sudo netstat -antup | grep 5432

Output:

tcp        0      0 0.0.0.0:5432            0.0.0.0:*               LISTEN      3712/postgres
tcp6       0      0 :::5432                 :::*                    LISTEN      3712/postgres

READ: netstat command not found on Ubuntu – Quick Fix

Access PostgreSQL

To manage the database, you need to log in as postgres user.

sudo su -l postgres

Access the database using the psql command. It is an interactive shell for working with PostgreSQL database.

psql

Output:

postgres@server:~$ psql
psql (11.2 (Debian 11.2-1.pgdg90+1))
Type "help" for help.

postgres=#

Secure PostgreSQL database

We will set a password for Linux user (postgres) as well as DB administrator (postgres).

Set password for Linux user (postgres):

sudo passwd postgres

Output:

raj@mydebian:~$ sudo passwd postgres
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully

Set password for DB administrator (postgres):

su - postgres
psql

On psql shell, run below command to change the database admin password.

postgres=# \password

OR

postgres=# \password postgres

Output:

postgres=# \password postgres
Enter new password:
Enter it again:

PostgreSQL DB Commands

The syntax for creating a database is:

$ su - postgres

$ createdb test

The syntax for creating a user (raj) is:

$ psql test

test=# CREATE USER raj WITH SUPERUSER LOGIN PASSWORD 'password';

Check whether the new user has been created or not.

test=# \du

Output:

test=# \du
                                   List of roles
 Role name |                         Attributes                         | Member of
-----------+------------------------------------------------------------+-----------
 postgres  | Superuser, Create role, Create DB, Replication, Bypass RLS | {}
 raj       | Superuser                                                  | {}

Log in with the user “raj”.

psql -h localhost -d test -U raj

Output:

psql (11.2 (Debian 11.2-1.pgdg90+1))
SSL connection (protocol: TLSv1.2, cipher: ECDHE-RSA-AES256-GCM-SHA384, bits: 256, compression: off)
Type "help" for help.

test=#

The syntax for listing databases:

test=# \l

Output:

test=# \l
                                  List of databases
   Name    |  Owner   | Encoding |   Collate   |    Ctype    |   Access privileges
-----------+----------+----------+-------------+-------------+-----------------------
 postgres  | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
 template0 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +
           |          |          |             |             | postgres=CTc/postgres
 template1 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +
           |          |          |             |             | postgres=CTc/postgres
 test      | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
(4 rows)

That’s All. You have successfully installed the PostgreSQL 11 / 10 on Debian 9 / Debian 8.

Further Reading

You might also like

How To Install PostgreSQL 11 / 10 on Debian 9 & Debian 8

2