Docker postgres does not run init file in docker-entrypoint-initdb.d - postgresql

Question

Based on Docker's Postgres documentation, I can create any *.sql file inside /docker-entrypoint-initdb.d and have it automatically run.
I have init.sql that contains CREATE DATABASE ronda;
In my docker-compose.yaml, I have
web:
restart: always
build: ./web
expose:
- "8000"
links:
- postgres:postgres
volumes:
- /usr/src/app/static
env_file: .env
command: /usr/local/bin/gunicorn ronda.wsgi:application -w 2 -b :8000
nginx:
restart: always
build: ./nginx/
ports:
- "80:80"
volumes:
- /www/static
volumes_from:
- web
links:
- web:web
postgres:
restart: always
build: ./postgres/
volumes_from:
- data
ports:
- "5432:5432"
data:
restart: always
build: ./postgres/
volumes:
- /var/lib/postgresql
command: "true"
and my postgres Dockerfile,
FROM library/postgres
RUN mkdir -p /docker-entrypoint-initdb.d
COPY init.sql /docker-entrypoint-initdb.d/
Running docker-compose build and docker-compose up work fine, but the database ronda is not created.

Answer 1

This is how I use postgres on my projects and preload the database.
file: docker-compose.yml
db:
container_name: db_service
build:
context: .
dockerfile: ./Dockerfile.postgres
ports:
- "5432:5432"
volumes:
- /var/lib/postgresql/data/
This Dockerfile load the file named pg_dump.backup(binary dump) or psql_dump.sql(plain text dump) if exist on root folder of the project.
file: Dockerfile.postgres
FROM postgres:9.6-alpine
ENV POSTGRES_DB DatabaseName
COPY pg_dump.backup .
COPY pg_dump.sql .
RUN [[ -e "pg_dump.backup" ]] && pg_restore pg_dump.backup > pg_dump.sql
# Preload database on init
RUN [[ -e "pg_dump.sql" ]] && cp pg_dump.sql /docker-entrypoint-initdb.d/
In case of need retry the loading of the dump, you can remove the current database with the command:
docker-compose rm db
Then you can run docker-compose up to retry load the database.

Answer 2

If your initialisation requirements are just to create the ronda schema, then you could just make use of the POSTGRES_DB environment variable as described in the documentation.
The bit of your docker-compose.yml file for the postgres service would then be:
postgres:
restart: always
build: ./postgres/
volumes_from:
- data
ports:
- "5432:5432"
environment:
POSTGRES_DB: ronda
On a side note, do not use restart: always for your data container as this container does not run any service (just the true command). Doing this you are basically telling Docker to run the true command in an infinite loop.

Answer 3

Had the same problem with postgres 11.
Some points that helped me:
run:
docker-compose rm
docker-compose build
docker-compose up
The obvious: don't run compose in detached mode. You want to see the logs.
After adding the step docker-compose rm to the mix it worked, finally.