Postgres on docker-compose

docker-compose.yml

# Use postgres/example user/password credentials
version: '3.1'

services:

  db:
    image: postgres:10
    restart: always
    environment:
      - POSTGRES_PASSWORD=example
      - POSTGRES_USER=postgres
      - POSTGRES_DB=real_time_chat
    ports:
      - '5432:5432'

#  adminer:
#    image: adminer
#    restart: always
#    ports:
#      - 8080:8080