Docker file wait for postgres container - postgresql

Question

Hello I have the following error in my node project:
(node:51) UnhandledPromiseRejectionWarning: Error: getaddrinfo
ENOTFOUND ${DB_HOST}
I'm thinking the problem is that my postgress is not yet started when my project starts
and so I'm not able to think of a solution on how to start my container after my postgres is ready, I read something about dockerize, but I'm not able to imagine how to apply
my docker file:
FROM node:lts-alpine
RUN mkdir -p /home/node/api/node_modules && chown -R node:node /home/node/api
WORKDIR /home/node/api
COPY ormconfig.json .env package.json yarn.* ./
USER node
RUN yarn
COPY --chown=node:node . .
EXPOSE 4000
CMD ["yarn", "dev"]
my docker compose:
version: '3.7'
services:
ci-api:
build: .
container_name: ci-api
volumes:
- .:/home/node/api
- /home/node/api/node_modules
ports:
- '${SERVER_PORT}:${SERVER_PORT}'
depends_on:
- ci-postgres
networks:
- ci-network
ci-postgres:
image: postgres:12
container_name: ci-postgres
ports:
- '${DB_PORT}:5432'
environment:
- ALLOW_EMPTY_PASSWORD=no
- POSTGRES_USER=${DB_USER}
- POSTGRES_PASSWORD=${DB_PASS}
- POSTGRES_DB=${DB_NAME}
volumes:
- ci-postgres-data:/data
networks:
- ci-network
volumes:
ci-postgres-data:
networks:
ci-network:
driver: bridge
and this is my .env
SERVER_PORT=4000
DB_HOST=ci-postgres
DB_PORT=5432
DB_USER=spirit
DB_PASS=api
DB_NAME=emasa_ci

Answer 1

You can reference the below docker-compose.yml in which depends_on, healthcheck and links are added as web service depends on db service.
Reference:
Postgresql Container is not running in docker-compose file - Why is this?
version: "3"
services:
webapp:
build: .
container_name: webapp
ports:
- "5000:5000"
links:
- postgres
depends_on:
postgres:
condition: service_healthy
postgres:
image: postgres:11-alpine
container_name: postgres
ports:
- "5432:5432"
environment:
- POSTGRES_DB=tmp
- POSTGRES_USER=tmp
- POSTGRES_PASSWORD=tmp_password
volumes: # Persist the db data
- database-data:/var/lib/postgresql/data
healthcheck:
test: ["CMD-SHELL", "pg_isready -U postgres"]
interval: 10s
timeout: 5s
retries: 5
volumes:
database-data: