MySQL provides the ability to create and users from its shell. Security is an important part of the database servers. In this tutorial, we will examine how to create users and manage privileges in MySQL database server. We will specifically learn to restrict user access to a database, database server, grant different types of privileges, print these privileges.
Login To MySQL Shell
In order to create a user and manage the privileges of this user, we will log in to the MySQL shell. MySQL shell provides the ability to access databases, run SQL queries, administrative operations like create user, delete user, manage user privileges. We will use
mysql command with the user name which is
root in this case. We will provide the
root user password too.
$ sudo mysql -u root -p
Create New Database User
We will use
CREATE USER command by providing the user name, hostname, and password. The hostname is used to set whether the user can connect from a given host. In this example, we specify the
localhost which means given user
ismail can only connect from localhost to this database server. We also provide the password as
> CREATE USER 'ismail'@'localhost' IDENTIFIED BY 'SoS3cret..!';
As it is successfully created
Query OK, 0 rows affected (0.01 sec) is printed.
Remove Existing Database User
If we do not need a given database user we have to remove users because it may create security problems and unintended database access. We can remove the existing database user with the DROP USER command by providing the user name and access hostname. In this example, we will remove user
> DROP USER ismail@localhost;
List Existing Database Users
After creating a database user we may want to check and list existing users in the MySQL database. In this case, we will use an SQL statement that will list the content of the
user table in the
mysql database holds database server users and related information like password etc. We will use
SELECT User statement.
> SELECT User FROM mysql.user;
Create New User with To Access Specific Database
We can specify a user only access to the specified databases. This will prevent user access to other databases. We will use GRANT ALL PRIVILEGES command in this case by providing the database name, user name, and hostname. In the following example, we will grant all privileges of the database
poftut to the user
> GRANT ALL PRIVILEGES ON poftut . * TO 'ismail'@'localhost';
Write Changes To Database
Changes may be stored in the cache which will not effective immediately. We can write these changes into the database server explicitly with the following command.
> FLUSH PRIVILEGES;
Create New User with Access Location
We can also specify the access location for the given user and database. Up to now, we have used the localhost which is a secure way where only local users can access. We can also provide access rights for specific networks or hosts. In this example, we will provide access from the IP Address
> GRANT ALL PRIVILEGES ON poftut . * TO 'ismail'@'192.168.1.10';
Show and List Given User Privileges
We may want to list granted privileges for the given user. We will use SHOW GRANTS FOR command for this operation. In this example, we will list granted privileges for the user
ismail access from
> SHOW GRANTS FOR ismail@localhost;
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