Precautions when creating PostgreSQL with docker-compose

What to do if you get the following error when trying to create PostgreSQL with docker-compose

Former story https://stackoverflow.com/questions/51168558/how-to-mount-a-postgresql-volume-using-aws-ebs-in-kubernete

postgres-db | initdb: error: directory "/var/lib/postgresql/data" exists but is not empty
postgres-db | It contains a dot-prefixed/invisible file, perhaps due to it being a mount point.
postgres-db | Using a mount point directly as the data directory is not recommended.
postgres-db | Create a subdirectory under the mount point.
postgres-db exited with code 1

Attempting to create data in / var / lib / postgresql / data has failed.

The solution is to specify the environment variable PGDATA to specify the location of the database body, which is changed from the default / var / lib / postgresql / data to / var / lib / postgresql / data / pgdata. There is a possibility that it can be solved by deepening one layer like (pgdata can be another name).

In the following example, volumes / postgres_root mounts the container / var / lib / postgresql / data, environment / PGDATA, and / var / lib / postgresql / data / pgdata. Create data in the location. ..

20-10-23 fix

volumes: postgres_root: driver_opts: type: none doesn't seem to work on Mac and windows, so fix it

version: '3'
services:
  postgres:
    image: postgres:12.2
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: 'pass'
      POSTGRES_DB: 'pg'
      PGDATA: /var/lib/postgresql/data/pgdata
    ports:
      - 5432:5432
    container_name: postgres-db
    volumes:
      - ./db/postgres:/var/lib/postgresql/data
      - ./db/logs:/var/log