Setting up a PostgreSQL Database on Ubuntu
By: Alibaba Cloud
Tags: Ubuntu, Psql, Database, Postgresql, Alibabacloud

In this guide, we will install and set up a PostgreSQL database on an Ubuntu instance using Alibaba Cloud Elastic Compute Service (ECS).

After you have an instance installed with Ubuntu OS, follow the steps below

1. SSH into your instance using your key pair for Linux user. For windows, you can use SSH client such as putty to connect to your instance.

2. We have to update & upgrade our Ubuntu to latest packages using the commands below

sudo apt-get update && sudo apt-get upgrade

3. Install PostgreSQL by running the command below

sudo apt-get install postgresql

4. To check the version of PostgreSQL installed run psql -V

5. We are going to edit the PostgreSQL configuration file to change the address.

To edit the configuration file( pg_hba.conf ), run sudo vim /etc/postgresql/9.5/main/pg_hba.conf .

9.5 is the version of postgreSQL installed. As at the time of writing this article, 9.5 is the default installation for postgreSQL on ubuntu OS.

6. After opening our pg_hba.conf in vim, you can use any editor of your choice. Update the file which read something like this

by default

# TYPE DATABASE USER ADDRESS METHOD # "local" is for Unix domain socket connections only

local all all peer

# IPv4 local connections:

host all all 127.0.0.1/32 md5

# IPv6 local connections:

host all all ::1/128 md5

to

# TYPE DATABASE USER ADDRESS METHOD # "local" is for Unix domain socket connections only

local all all peer

# IPv4 local connections:

host all all 0.0.0.0/0 md5

# IPv6 local connections:

host all all ::1/128 md5

This would enable us connect to our database instance.

7. We need to update the postgresql.conf file to enable remote connection from anywhere(IP address).

To edit postgresql.conf file run sudo vim /etc/postgresql/9.5/main/postgresql.conf . Use :set number to enable the line numbers and look for line 59 which should be like this

#listen_addresses = 'localhost'

Update it to this

listen_addresses = '*'

8. To make an effect on the changes made, we need to restart the PostgreSQL service. We can do that by running the command below

sudo /etc/init.d/postgresql restart

9. Now that our PostgreSQL database is ready. we can log into PostgreSQL and create a username and a database.

sudo - su postgres

psql

The psql command gives us access to the Postgres interactive terminal

10. Create a username by running the command below

CREATE USER ubuntu_user SUPERUSER;

11. We have to create a password for the user with the command below

ALTER USER power_user WITH PASSWORD 'password';

12. To create a database with the user created, run

CREATE DATABASE mydatabase WITH OWNER power_user;

13. To exit from psql shell, run q. We can view the content of our database and make changes to it with psql. We can also connect to our database using a database client.

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Reference

https://www.alibabacloud.com/blog/setting-up-a-postgresql-database-on-ubuntu_594910?spm=a2c41.13018659.0.0