docker-compose restore mongo database every time collection deletes - mongodb

Question

i want to be able to recreate some base data that is dumped when mongo-data folder is deleted and docker-compose up is called.
the problem that im facing is that app does not have mongo
these are my files:
docker-compose.yml
version: "3"
services:
app:
build:
context: .
dockerfile: Dockerfile
ports:
- "3000:3000"
volumes:
- .:/testapp
environment:
DB_URL: mongodb://test_mongo/appdb
depends_on:
- mongo
mongo:
image: "mongo:4.4.4"
restart: always
container_name: test_mongo
ports:
- "27017:27017"
- "27018:27018"
volumes:
- ./mongo-data:/data/db
Dockerfile:
FROM node:14.15.5
RUN mkdir -p /testapp
WORKDIR /testapp
EXPOSE 3000
ENTRYPOINT ["./entrypoint.sh"]
entrypoint.sh:
#!/bin/bash
sh ./__backup__/db/restore.sh
sh ./__backup__/app/restore.sh
yarn install
yarn start:dev
backup/app/restore.sh:
#!/bin/bash
if [[ ! -d '/testapp/uploads' ]]
then
tar -xvf ./uploads.tar.gz /testapp/
fi
backup/app/restore.sh:
#!/bin/bash
until mongo --eval "print(\"waited for connection\")"
do
sleep 1
done
if [[ ! -d '/testapp/mongo-data' ]]
then
mongorestore --archive ./db.dump
fi
is there anyway to run these resotre.sh files after mongo service is up or running mongo from app?

Answer 1

If I understand the question correctly, you want to restore the MongoDB to a certain state every time your app launches, and you're asking if there's a way to do it after MongoDB container launches.
There's a tool called docker-compose-wait, quoting from its GitHub README, it's a small command-line utility to wait for other docker images to be started while using docker-compose.
It's fairly simple to use it. Add it to the image, run /wait to wait for services to be up, and get on to whatever you want next.
So according to your current setup, your Dockerfile could be like this:
FROM node:14.15.5
## Add the wait script to the image
ADD https://github.com/ufoscout/docker-compose-wait/releases/download/2.9.0/wait /wait
RUN chmod +x /wait
RUN mkdir -p /testapp
WORKDIR /testapp
ADD . .
EXPOSE 3000
## Launch the wait tool and then your entrypoint.sh
ENTRYPOINT /wait && /testapp/entrypoint.sh"
In which your entrypoint.sh was already written to call the restore script. In your docker-compose.yml, add environment variable to set up the services to be waited.
version: "3"
services:
app:
build:
context: .
dockerfile: Dockerfile
ports:
- "3000:3000"
volumes:
- .:/testapp
environment:
DB_URL: mongodb://test_mongo/appdb
WAIT_HOSTS: mongo:27017
depends_on:
- mongo
mongo:
image: "mongo:4.4.4"
restart: always
container_name: test_mongo
ports:
- "27017:27017"
- "27018:27018"
volumes:
- ./mongo-data:/data/db