DOCKER - Airflow How can i Init my postgres scripts in Airflow DB when i docker compose

Question

I am testing some stuff where I have to init my Postgres DB DDL into airflow Postgres DB when I compose-up it should automatically init for one time as it will be cached afterward as airflow DB works usually. Thanks

Answer 1

As requested in the last comment: Adding your own database to the Airflow Docker-compose file:

Put this piece of code as a service somewhere amongst the other services:

  mypostgres:
    image: postgres:13
    environment:
      POSTGRES_USER: mydbuser
      POSTGRES_PASSWORD: securepassword
      POSTGRES_DB: mydb
    volumes:
      - ./database:/var/lib/postgresql/data
      - ./init-database.sh:/docker-entrypoint-initdb.d/init-database.sh
    restart: always
    

Make sure you have a database-directory and a init-database.sh file in the current directory (otherwise the volume mappings fail)

Answer 2

I have found a solution that works and init your scripts when you docker composed up.

pro TIP: If you want to add more files and you have already init the airflow DB or your DB what you can do is docker-compose down --volume what this will do will automatically remove all the data in the data directory. and for init to work Postgres data directory have to be empty

postgres:
    image: postgres:13

    environment:
      POSTGRES_USER: airflow
      POSTGRES_PASSWORD: airflow
      POSTGRES_DB: airflow

    ports: 
    - "5432:5432"

    volumes:
      - postgres-db-volume:/var/lib/postgresql/data
      - /path/to/my/host/folder/filename.sql:/docker-entrypoint-initdb.d/filename.sql

    healthcheck:
      test: ["CMD", "pg_isready", "-U", "airflow"]
      interval: 5s
      retries: 5
    restart: always

volumes:
  postgres-db-volume: