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Localhost Databases

PostgreSQL also known as Postgres.

About • Disclaimer • Getting Started • Download • How To Use

About

PostgreSQL, also known as Postgres, is a free and open-source relational database management system emphasizing extensibility and SQL compliance.

Disclaimer

Important

Localhost Databases is not affiliated with the databases' developers/owners and is not an official product.

Localhost Databases has been developed to run databases in a local Docker environment. To install a production instance, read the databases' respective installation guides.

Getting Started

You will need to make sure your system meets the following prerequisites:

  • Docker Engine >= 20.10.0

This repository utilizes Docker to run the PostgreSQL sample. So, before using the PostgreSQL, make sure you have Docker installed on your system.

Download

To use PostgreSQL, you can clone the latest version of Localhost Databases repository for macOS, Linux and Windows.

# Clone this repository.
$ git clone [email protected]:luisaveiro/localhost-databases.git --branch main --single-branch

You can locate the PostgreSQL Docker configuration in the databases directory.

# Navigate to the PostgreSQL folder.
$ cd localhost-databases/databases/pgsql

How To Use

There are a few steps you need to follow before you can have an PostgreSQL database set up and running in Docker container. I have outline the steps you would need to take to get started.

1. Environment Variables

Before you start a database in a Docker container, you will need to create a DotEnv file. The DotEnv file will allow you to configure your database's credentials and map a container's port.

Localhost Databases includes a .env.example file for PostgreSQL Database. You can run the following command in the terminal to create your DotEnv file.

# Navigate to a database.
$ cd databases/pgsql

# Create .env from .env.example.
$ cp .env.example .env

The PostgreSQL Docker Compose file uses the follow variables from the DotEnv file.

#--------------------------------------------------------------------------
# Docker env
#--------------------------------------------------------------------------

# The project name. | default: pgsql
APP_NAME="pgsql"

#--------------------------------------------------------------------------
# Database (PostgreSQL) env
#--------------------------------------------------------------------------

# The PostgreSQL database container name. | default: pgsql_db
DB_CONTAINER_NAME="${APP_NAME}_db"

# The PostgreSQL database configuration. | default: local
DB_DATABASE="local"

# The PostgreSQL database user credentials.
DB_USERNAME=""
DB_PASSWORD=""

#--------------------------------------------------------------------------
# Network env
#--------------------------------------------------------------------------

# Map the database container exposed port to the host port. | default: 5432
DB_PORT=5432

# The Docker network for the containers. | default: local_dbs_network
NETWORK_NAME="local_dbs_network"

#--------------------------------------------------------------------------
# Volume env
#--------------------------------------------------------------------------

# The database container data volume. | default: pgsql_db_data
DB_VOLUME_DATA_NAME="${DB_CONTAINER_NAME}_data"

For a list of available environment variables that the PostgreSQL Docker image supports, you can visit PostgreSQL Docker Hub page.

2. Start Docker container

To start the PostgreSQL container, you can run the following command:

# Navigate to PostgreSQL database.
$ cd databases/pgsql

# Run Docker Compose command.
$ docker compose up -d
Expected result

To check the PostgreSQL container is running and the port mapping is configured correctly, you can run the following command:

# List containers
$ docker ps

You should see a similar output.

CONTAINER ID   IMAGE             COMMAND                  CREATED          STATUS                    PORTS                    NAMES
4f4213061f5c   postgres:latest   "docker-entrypoint.s…"   43 seconds ago   Up 42 seconds (healthy)   0.0.0.0:5432->5432/tcp   pgsql_db

3. Stop Docker container

To stop the PostgreSQL container, you can run the following command:

$ docker compose down

4. Connect to Database

To connect to your PostgreSQL container from your database client, you will need to provide the following settings:

HOST=127.0.0.1
PORT="${DB_PORT}"

USER="${DB_USERNAME}"
PASSWORD="${DB_PASSWORD}"

DATABASE="${DB_DATABASE}"
Expected result

Below is a screenshot of the settings used in TablePlus:

TablePlus settings for PostgreSQL
TablePlus settings for PostgreSQL.

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