run script on docker file to wait postgress - postgresql

Question

Hello i'm new to docker and linux and i don't know how to run a script for my docker to run after my postgress
this is my script:
until psql -c '\l'; do
echo >&2 "$(date +%Y%m%dt%H%M%S) Postgres is unavailable - sleeping"
sleep 1
done
echo >&2 "$(date +%Y%m%dt%H%M%S) Postgres is up - executing command"
exec ${#}
my docker file :
FROM node:lts-alpine
RUN mkdir -p /home/node/api/node_modules && chown -R node:node /home/node/api
WORKDIR /home/node/api
COPY wait-pg.sh ormconfig.json .env package.json yarn.* ./
USER node
RUN yarn
COPY --chown=node:node . .
EXPOSE 4000
RUN chmod +x /wait-pg.sh
CMD ["yarn", "dev"]
my docker compose:
version: '3.7'
services:
db-pg:
image: postgres:12
container_name: db-pg
ports:
- '${DB_PORT}:5432'
environment:
ALLOW_EMPTY_PASSWORD: 'no'
POSTGRES_USER: ${DB_USER}
POSTGRES_PASSWORD: ${DB_PASS}
POSTGRES_DB: ${DB_NAME}
volumes:
- ci-postgres-data:/data
ci-api:
build: .
container_name: ci-api
volumes:
- .:/home/node/api
- /home/node/api/node_modules
ports:
- '${SERVER_PORT}:${SERVER_PORT}'
depends_on:
- db-pg
logging:
driver: 'json-file'
options:
max-size: '10m'
max-file: '5'
volumes:
ci-postgres-data:
If someone can help me like I would in my docker compose and in my dockerfile.
I would like to know how I can add my script to my docker file and docker compose

Answer 1

Check the below Dockerfile
FROM node:lts-alpine
RUN mkdir -p /home/node/api/node_modules && chown -R node:node /home/node/api
WORKDIR /home/node/api
COPY wait-pg.sh ormconfig.json .env package.json yarn.* ./
USER node
RUN yarn
COPY --chown=node:node . .
EXPOSE 4000
CMD ["yarn", "dev"]
Please try the below docker-compose.yml in which depends_on, healthcheck and links are added as web service depends on db service.
version: "2.1"
services:
ci-api:
build: .
container_name: ci-api
volumes:
- .:/home/node/api
- /home/node/api/node_modules
ports:
- '${SERVER_PORT}:${SERVER_PORT}'
links:
- db-pg
depends_on:
- db-pg
logging:
driver: 'json-file'
options:
max-size: '10m'
max-file: '5'
db-pg:
image: postgres:12
container_name: db-pg
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
healthcheck:
test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER}"]
interval: 10s
timeout: 5s
retries: 5
volumes:
ci-postgres-data: