Postgresql 16

General

PostgreSQL is a well known opensource database that scales well and is easy to use. in Alpine v3.20 we can install the latest version using the package postgresql16

Install

apk add postgresql16 postgresql16-contrib postgresql16-openrc

rc-update add postgresql

rc-service postgresql start

This will start the postgresql 16 server and perform some initial configuration.

Configure

login as the postgres user and start psql to create a new user and database:

su postgres

psql

create user myuser with encrypted password 'mypass';

create database mydb;

grant all privileges on database mydb to myuser;

Use

By default only local access is allowed to PostgreSQL. to allow other networked services to access the database we need to configure PostgreSQL to allow external connections.

modify the postgresql.conf file

nano /etc/postgresql16/postgresql.conf

Find the line that starts with

#listen_addresses = 'localhost'

Uncomment it and change it to the following:

listen_addresses = '*'

If you want it to listen on a specific ip you can change * to 192.168.1.2/24. Save the file and change the next config file.

modify the pg_hba.conf file

nano /etc/postgresql16/pg_hba.conf

look for the line: host all all 127.0.0.1/32 md5 and change it to: host all all 0.0.0.0/0 md5 This line allows connections from any IP address and requires a password for authentication (md5).

Troubleshooting

• Some troubleshooting information

Upgrading PostgreSQL

• Notes on upgrading PostgreSQL 16 to 17

Resources

• https://blog.devart.com/configure-postgresql-to-allow-remote-connection.html