Postgres docker compose

docker-compose.yml

version: "3.4"
volumes:
 my_postgres:
services:
 postgres:
   container_name: my_postgres
   image: postgres:12.0-alpine
   restart: always
   environment:
     - POSTGRES_USER=postgres
     - POSTGRES_PASSWORD=postgres
   ports:
     - "5432:5432"
   volumes:
     - my_postgres:/var/lib/postgresql/data
   logging:
     options:
       max-file: "5"
       max-size: "10m"