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February 25, 2022

Set up Local Environment for Mongo using Docker

coding

mongo

Contents

Start from Docker Hub

We don't need to install anything from mongo website, we just need to pull the mongo image from docker hub.

To have authentication, a super/root user called admin must be created in the first place. For that, instead of just running the image, we pass the environment variables

  • MONGO_INITDB_ROOT_USERNAME and
  • MONGO_INITDB_ROOT_USERNAME in
docker run
  -d
  --name bddms-mongo \
  -p 27017:27017 \
  -e MONGO_INITDB_ROOT_USERNAME=admin \
  -e MONGO_INITDB_ROOT_PASSWORD=123 \
  -v "/c/Users/user/OneDrive/Documents/db_backup/docker_bddms":/data/db mongo

Here my local directory /c/Users/user/OneDrive/Documents/db_backup/docker_bddms is mount as a volume to the container's directory /data/db.

Create User in Mongo Shell

When this image is run in the detached mode, run

docker exec -it cb39731a97ff sh

to get into the cli of the container running our mongo instance with id cb39731a97ff.

We are ready to init the mongo shell and add user. For this, run

mongo -u admin -p 123

For sheer purpose of fulfilling the hard-coded config in the project, I need:

  • A user called bdsons with pwd bdsonspass;
  • authSource=admin for authentication, i.e., create a user bdsons inside the database admin;
  • bdsons to have access right to the database bdsons.

Therefore:

use admin

db.createUser({ \
user: "bdsons", pwd: "bdsonspass", \
roles:[{db: "admin", role:"readWrite"}, {db:"bdsons", role:"readWrite"}] \
})

Then by running db.getUsers() we have

[
  ...,
  {
    "_id" : "admin.bdsons",
    "userId" : UUID("815c8f70-a65f-452d-a877-864d2d69fa00"),
    "user" : "bdsons",
    "db" : "admin",
    "roles" : [
      {
        "role" : "readWrite",
        "db" : "bdsons"
      },
      {
        "role" : "readWrite",
        "db" : "admin"
      }
    ],
    "mechanisms" : [
      "SCRAM-SHA-1",
      "SCRAM-SHA-256"
    ]
  }
]

authSource in the connection string to mongodb will look at user.db for authentication (trap: not the "db" in the roles).

Connect to the mongoDb with Auth

Now I can connect to the database named bdsons by using the string:

mongodb://bdsons:bdsonspass@localhost:27017/bdsons?authSource=admin