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Setup Postgres Database in Docker Container for Development

Authors
Saad Bash

docker-compose.yml for Postgres

services:
  db:
    image: postgres:17.0
    hostname: ${DB_HOST}
    ports:
      - '5432:${DB_PORT}'
    environment:
      POSTGRES_USER: ${DB_USER}
      POSTGRES_PASSWORD: ${DB_PASSWORD}
      POSTGRES_DB: ${DB_NAME}
    volumes:
      - pgdata:/var/lib/postgresql/data
volumes:
  pgdata:

.env file

DATABASE_URL=postgresql://postgres:password@localhost:5432/main
DB_HOST=localhost
DB_PORT=5432
DB_USER=postgres
DB_PASSWORD=password
DB_NAME=main

Commands to run

docker-compose up -d

Connect to Postgres

psql -h localhost -p 5432 -U postgres -d postgres

Example JavaScript file to test connection

// file: index.mjs
import { Client } from 'pg'
const client = new Client({
  host: process.env.DB_HOST,
  port: process.env.DB_PORT,
  user: process.env.DB_USER,
  password: process.env.DB_PASSWORD,
  database: process.env.DB_NAME,
})

client
  .connect()
  .then(() => console.log('Connected to Postgres'))
  .catch((err) => console.error('Connection error:', err.stack))
  .finally(() => client.end())

To run the file, use:

node --env-file .env index.mjs

Stop and remove container

docker-compose down -v

Notes

  • The -v flag in the docker-compose down command removes the named volume pgdata, which deletes all the data stored in the Postgres database. Use this with caution if you want to keep your data.
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