Use MongoDB with docker-compose: create database and user - docker

Question

Is possible to create a database using docker-compose? I'm trying to run mongodb on docker but I'm not able to create user and initial database :(
version: '3.1'
services:
mongo:
image: mongo
restart: always
environment:
- MONGO_INITDB_DATABASE=test
- MONGO_INITDB_ROOT_USERNAME=admin
- MONGO_INITDB_ROOT_PASSWORD=admin
volumes:
- ~/docker/volumes/mongodb:/data/db
ports:
- 27017:27017
What is missing in my script?
test code:
from pymongo import MongoClient
mongo_client = MongoClient('mongodb://%s:%s#127.0.0.1' % ('admin', 'admin'))
cursor = mongo_client.list_databases()
for db in cursor:
print(db)

Answer 1

The above docker-compose seems fine, it will create a user named admin and the DB named will be test if your *.js file contain insert data script. otherwise, it will not create Database because so if you do not insert data with your JavaScript files, then no database is created.
You can log in with these credential that specifies in env.
- MONGO_INITDB_DATABASE=test
- MONGO_INITDB_ROOT_USERNAME=test
- MONGO_INITDB_ROOT_PASSWORD=admin
To initialize DB, you need to mount you DB init script.
volumes:
- ~/docker/volumes/mongodb:/data/db
- youdbscript/init.js:/docker-entrypoint-initdb.d/
MONGO_INITDB_DATABASE
This variable allows you to specify the name of a database to be used
for creation scripts in /docker-entrypoint-initdb.d/*.js (see
Initializing a fresh instance below). MongoDB is fundamentally
designed for "create on first use", so if you do not insert data with
your JavaScript files, then no database is created.
Initializing a fresh instance
When a container is started for the first time it will execute files
with extensions .sh and .js that are found in
/docker-entrypoint-initdb.d. Files will be executed in alphabetical
order. .js files will be executed by mongo using the database
specified by the MONGO_INITDB_DATABASE variable, if it is present, or
test otherwise. You may also switch databases within the .js script.
mongo-docker
Update:
For your information the code you pasted code is not js file. its python script. Also, change the user name from admin might conflict with admin.
from pymongo import MongoClient
mongo_client = MongoClient('mongodb://%s:%s#127.0.0.1' % ('admin', 'admin'))
cursor = mongo_client.list_databases()
for db in cursor:
print(db)
You init script will some thing like
youdbscript/init.js
You can try this.
db = db.getSiblingDB("test");
db.article.drop();
db.article.save( {
title : "this is my title" ,
author : "bob" ,
posted : new Date(1079895594000) ,
pageViews : 5 ,
tags : [ "fun" , "good" , "fun" ] ,
comments : [
{ author :"joe" , text : "this is cool" } ,
{ author :"sam" , text : "this is bad" }
],
other : { foo : 5 }
});

Answer 2

Just like #Adiii answer. If you just declare a db name and not insert some data. The db will not created actually.
As your question. You can add one simple script (such as .sh or .js script) to the path /docker-entrypoint-initdb.d. Like the docs on mongo Initializing a fresh instance section.