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Contents

- Install PostgresSQL server on Ubuntu and remote access with Python

Build PostgresSQL Server

Step 1. Install PostgresSQL Server

- Check which version of PostgreSQL to install on Ubuntu

apt show postgresql

- PostgreSQL Package Setting

sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list. d/pgdg.list'
wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
sudo apt-get update

- Install PostgreSQL on Ubuntu

sudo apt-get -y install postgresql
sudo apt install postgresql postgresql-contrib

- Run PostgresSQL service

sudo service postgresql start

- Show PostgreSQL status

sudo service postgresql status

Step 2. Set PostgresSQL Admin Account

- Connect PostgresSQL Server and

sudo -i -u postgres
psql

- Confirm the current connection and user information

\conninfo

- Set Passwords of PostgresSQL Admin Account

  • 'postgres' is default admin account of PostgresSQL
ALTER USER postgres WITH PASSWORD '{passwords}';

- Show PostgresSQL Accounts

\du

Step 3. Create PostgresSQL Database

- Create PostgresSQL Database

  • Set Owner as 'postgres'
CREATE DATABASE {db_name} OWNER postgres;

- Show PostgresSQL Database

\list

- Disconnect PostgresSQL Server

exit

Step 4. Allow Remote Access

- Move to path of PostgresSQL configs file

cd /etc/postgresql/{version_of_PostgresSQL}/main

- Edit 'postgresql.conf' file

  • Set 'listen_addresses' as '0.0.0.0' for listening to all IPs
  • Set 'port' to the port you want to connect to

sudo nano postgresql.conf

- Restart PostgresSQL service

  • For applying modified configs file
sudo service postgresql restart

- Edit 'pg_hba.conf' file

  • Add line as follow for allowing to connect all IPs

sudo nano pg_hba.conf

- Restart PostgresSQL service

  • For applying modified configs file
sudo service postgresql restart

Step 5. Test Remote Access

- Test remote access to PostgresSQL server and running query

  • Custom python PostgresSQL server class
    • Connect PostgreSQL server, Create table, Insert data, Select data etc.
python db_test --host '{server_ip}' --port {port} --db_name '{db_name}' --user 'postgres' --password '{password}' --table_name '{table_name}'

- Confirm data in created database

sudo -i -u postgres
psql -d {db_name} -U postgres -W
SELECT * FROM {table_name};