Mastering MongoDB User Management with Mongo Shell A Comprehensive Guide to Check and List All Users

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MongoDB provides robust user management capabilities that allow you to secure your data and control access to your database. In this guide, we’ll explore how to use the MongoDB shell to manage users and their permissions.

Connecting to the MongoDB Server

Before we can manage users in MongoDB, we need to connect to the MongoDB server using the mongo shell. Open your terminal or command prompt and enter the following command:

mongo

This will open up the mongo shell and connect you to the default localhost instance of MongoDB. If you’re connecting to a remote server, you’ll need to replace “localhost” with the IP address or hostname of the remote server.

Creating a User

To create a new user, we can use the db.createUser() method. Here’s an example:

use admin

db.createUser(
  {
    user: "myuser",
    pwd: "mypassword",
    roles: [ { role: "readWrite", db: "mydatabase" } ]
  }
)

In this example, we’re creating a user named “myuser” with the password “mypassword”. We’re also assigning the “readWrite” role to this user for the “mydatabase” database. This role allows the user to read and write data in the specified database.

Listing Users

To list all the users in the MongoDB instance, use the following command:

use admin

db.getUsers()

his will return a list of all the users in the “admin” database.

Updating a User

To update a user’s password, use the db.updateUser() method. Here’s an example:

use admin

db.updateUser(
  "myuser",
  {
    pwd: "newpassword"
  }
)

In this example, we’re updating the password for the “myuser” user to “newpassword”.

Deleting a User

To delete a user, use the db.dropUser() method. Here’s an example:

use admin

db.dropUser("myuser")

In this example, we’re deleting the “myuser” user.

Assigning Roles to a User

To assign roles to a user, use the db.grantRolesToUser() method. Here’s an example:

use admin

db.grantRolesToUser(
  "myuser",
  [
    { role: "read", db: "mydatabase" },
    { role: "readWrite", db: "myotherdatabase" }
  ]
)

In this example, we’re assigning the “read” role to the “myuser” user for the “mydatabase” database and the “readWrite” role to the “myuser” user for the “myotherdatabase” database.

Revoking Roles from a User

To revoke roles from a user, use the db.revokeRolesFromUser() method. Here’s an example:

use admin

db.revokeRolesFromUser(
  "myuser",
  [
    { role: "read", db: "mydatabase" },
    { role: "readWrite", db: "myotherdatabase" }
  ]
)

In this example, we’re revoking the “read” role from the “myuser” user for the “mydatabase” database and the “readWrite” role from the “myuser” user for the “myotherdatabase” database.

Conclusion

MongoDB provides a powerful set of user management capabilities that allow you to secure your data and control access to your database. By using the MongoDB shell, you can easily create, update, delete, and assign roles to users in your MongoDB instance.

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