Shows how to create a docker mongo status checker and run command after it connects successfully

mongo-status-checker.docker-compose.yml

version: '3.0'
services:
  mongo:
    image: mongo
    ports:
     - "27017:27017"
     - "28017:28017"
    environment:
     MONGO_INITDB_ROOT_USERNAME: mongoadmin
     MONGO_INITDB_ROOT_PASSWORD: secret
  mongo-config:
    image: mongo
    depends_on:
     - mongo
    command: >
      /bin/bash -c "
        until mongo --host mongo -u mongoadmin -p secret --authenticationDatabase admin --eval \"printjson(db.serverStatus())\"
        do
          echo sleeping;
          sleep 3;
        done;
        echo Successfully Connected, running Mongo config commands.;
        mongo --host mongo -u mongoadmin -p secret --authenticationDatabase admin mymongodb --eval 'db.createUser({ \"user\": \"mongouser\", \"pwd\": \"secret\", \"roles\": [ \"readWrite\", \"dbAdmin\" ] })';
      "

the mongo-config will be started after the mongo container starts and poll the mongo service in the mongo container until it is ready, then execute config scripts (in this case we are creating a user for the mymonogodb database). Afterwards the config container exits.

timeout should be added... one day

I am trying a similar thing, it says unknown host mongo