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MongoDB
db.createUser({
user: "username",
pwd: "password",
roles: [
{ role: "roleName", db: "databaseName" },
// Additional roles if needed
]
})
Let’s go through an example:
db.createUser({
user: "johnDoe",
pwd: "mySecretPassword",
roles: [
{ role: "readWrite", db: "myDatabase" },
{ role: "dbAdmin", db: "myDatabase" }
]
})
In this example, we are creating a user named “johnDoe” with the password “mySecretPassword”. The user is assigned two roles: “readWrite” and “dbAdmin” for the “myDatabase” database. The “readWrite” role grants read and write access to the database, allowing the user to perform CRUD operations on the collections within “myDatabase”. The “dbAdmin” role provides administrative privileges for the “myDatabase”, allowing the user to manage the database, create indexes, and perform other administrative tasks.
After executing the createUser() command, MongoDB will create the user account with the specified credentials and roles. The user can then authenticate using the provided username and password to access the database and perform actions based on the assigned roles.
It’s important to note that the createUser() command should be executed with administrative privileges, such as a user with the “userAdminAnyDatabase” or “root” role, to create users and assign roles effectively.
Please keep in mind that the specific roles available may vary depending on the version of MongoDB you are using. It’s recommended to refer to the MongoDB documentation for the most up-to-date information on available roles and their privileges.
In summary, the createUser() command in MongoDB allows you to create new user accounts, define their authentication credentials, and assign roles to control access and permissions for the database system.
db.updateUser("johnDoe", {
roles: [
{ role: "read", db: "myDatabase" },
{ role: "read", db: "anotherDatabase" }
]
})
In this example, we are modifying the user “johnDoe” and updating the roles associated with the account. The user will now have the “read” role for both the “myDatabase” and “anotherDatabase”. The db.updateUser() method modifies the existing user account with the specified changes.
db.dropUser("username")
Let’s go through an example:
db.dropUser("johnDoe")
In this example, we are using the dropUser() command to delete the user account named “johnDoe”. After executing the command, the user account will be removed from the database, and the associated credentials and roles will be permanently deleted.
It’s important to note that the dropUser() command should be executed with administrative privileges, such as a user with the “userAdminAnyDatabase” or “root” role, to delete user accounts effectively.
Here are a few points to keep in mind about the dropUser() command:
The command permanently deletes the user account and its associated credentials. Once a user account is dropped, it cannot be recovered.
If the user account being dropped is the same account currently being used to authenticate the current session, it may result in immediate loss of access to the database.
The
dropUser()command affects only the user account within a specific database. To drop a user account across all databases, you would need to execute thedropUser()command in each individual database.User accounts can only be dropped by users with appropriate administrative privileges.
When to use the dropUser() command:
Use
dropUser()when you want to permanently remove a user account from the database system.You may use it when a user no longer requires access to the database or when their role or privileges need to be completely revoked.
Please be cautious while using the dropUser() command as it irreversibly deletes user accounts. Always ensure that you have a proper backup and follow appropriate security practices when managing user accounts in MongoDB.
db.grantRolesToUser("username", [ { role: "roleName", db: "databaseName" }, ... ])
Here’s an example of how to use the grantRolesToUser() command:
db.grantRolesToUser("johnDoe", [
{ role: "readWrite", db: "myDatabase" },
{ role: "dbAdmin", db: "myDatabase" }
])
In this example, we are granting the “readWrite” and “dbAdmin” roles to the user account “johnDoe” for the “myDatabase” database. The user will have read and write access to the collections in “myDatabase” and administrative privileges to manage the database.
2. revokeRolesFromUser(): The revokeRolesFromUser() command is used to remove one or more roles from a user account in MongoDB. It allows you to revoke specific privileges and permissions from a user, restricting their access and capabilities within the database.
The basic syntax for the revokeRolesFromUser() command is as follows:
db.revokeRolesFromUser("username", [ { role: "roleName", db: "databaseName" }, ... ])
Here’s an example of how to use the revokeRolesFromUser() command:
db.revokeRolesFromUser("johnDoe", [
{ role: "readWrite", db: "myDatabase" },
{ role: "dbAdmin", db: "myDatabase" }
])
In this example, we are revoking the “readWrite” and “dbAdmin” roles from the user account “johnDoe” for the “myDatabase” database. The user will no longer have the read and write access or the administrative privileges in “myDatabase”.
It’s important to note that both commands should be executed with administrative privileges, such as a user with the “userAdminAnyDatabase” or “root” role, to manage user roles effectively.
When to use grantRolesToUser() and revokeRolesFromUser():
Use
grantRolesToUser()when you want to assign new roles and privileges to a user account.Use
revokeRolesFromUser()when you want to remove existing roles and privileges from a user account.
These commands are particularly useful when you need to adjust the access and permissions for specific users within your MongoDB database, allowing you to manage user roles and their associated privileges dynamically.
use myDatabase
db.getUser("johnDoe")
In this example, we switch to the “myDatabase” database and retrieve information about the user account “johnDoe”. The method will return an object containing details such as the user’s roles, privileges, authentication mechanisms, and other attributes associated with the account.
The purpose of the db.getUser() method is to fetch information about a specific user account. It can be helpful for administrators or developers who need to review or validate the properties and settings of a user account in MongoDB.
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