How to create persistent PostgreSQL database with docker-compose

To spin up Postgres on Docker, create docker-compose.yml like so:

version: '3.3'

services:
  db:
    image: postgres:14-alpine # alpine images are lighweight
    restart: always
    container_name: db
    ports:
      - 5432:5432 # expose default Postgres port for connections
    environment:
			# initialize database connection parameters with environment variables.
			# more info: <https://hub.docker.com/_/postgres>
      POSTGRES_USER: me
      POSTGRES_PASSWORD: password
      POSTGRES_DB: mydb
    volumes:
			# persistent storage of data
      - ./pg_data:/var/lib/postgresql/data

Finally in your terminal:

docker-compose up -d