How to create postgres database and run migration when docker-compose up - postgresql

Question

I'm setting up a simple backend that perform CRUD action with postgres database and want to create database and migration automatically when the docker-compose up runs.
I have already tried to add below code to Dockerfile or entrypoint.sh but none of them work.
createdb --host=localhost -p 5432 --username=postgres --no-password pg_development
createdb db:migrate
This code will work if run separately after docker is fully up
I have already tried to add - ./db-init:/docker-entrypoint-initdb.d to the volumes but that didn't work either
This is the Dockerfile
FROM node:10.12.0
# Create app directory
RUN mkdir -p /restify-pg
WORKDIR /restify-pg
EXPOSE 1337
ENTRYPOINT [ "./entrypoint.sh" ]
This is my docker-compose.yml
version: '3'
services:
db:
image: "postgres:11.2"
ports:
- "5432:5432"
volumes:
- ./pgData:/var/lib/psotgresql/data
environment:
POSTGRES_USER: postgres
POSTGRES_PASSWORD:
POSTGRES_DB: pg_development
app:
build:
context: .
dockerfile: Dockerfile
ports:
- "3000:3000"
volumes:
- .:/restify-pg
environment:
DB_HOST: db
entrypoint.sh (in here I get createdb: command not found)
#!/bin/bash
cd app
createdb --host=localhost -p 5432 --username=postgres --no-password pg_development
sequelize db:migrate
npm install
npm run dev
I expect that when I run docker, the migration and the db creation would happen.

Answer 1

entrypoint.sh (in here I get createdb: command not found)
Running createdb in the nodejs container will not work because it is postgres specific command and it's not installed by default in the nodejs image.
If you specify POSTGRES_DB: pg_development env var on postgres container, the database will be created automatically when the container starts. So no need to run createdb anyway in entrypoint.sh that is mounted in the nodejs container.
In order to make sequelize db:migrate work you need to:
add sequelize-cli to dependencies in package.json
run npm install so it gets installed
run npx sequelize db:migrate
Here is a proposal:
# docker-compose.yml
version: '3'
services:
db:
image: "postgres:11.2"
ports:
- "5432:5432"
volumes:
- ./pgData:/var/lib/postgresql/data
environment:
POSTGRES_USER: postgres
POSTGRES_PASSWORD:
POSTGRES_DB: pg_development
app:
working_dir: /restify-pg
entrypoint: ["/bin/bash", "./entrypoint.sh"]
image: node:10.12.0
ports:
- "3000:3000"
volumes:
- .:/restify-pg
environment:
DB_HOST: db
# package.json
{
...
"dependencies": {
...
"pg": "^7.9.0",
"pg-hstore": "^2.3.2",
"sequelize": "^5.2.9",
"sequelize-cli": "^5.4.0"
}
}
# entrypoint.sh
npm install
npx sequelize db:migrate
npm run dev

Answer 2

If you can run your migrations from nodejs instead of docker then consider this solution instead