Securing database servers is a critical aspect of protecting sensitive information and systems from unauthorized access and potential cyber attacks. MySQL, one of the most popular database platforms, is no exception. In this article, we will explore how to secure a MySQL server on the CentOS 7 operating system, step by step.

Installation of MySQL

Before initiating any security enhancements, it is essential to have MySQL server installed on your CentOS 7 system. You can install it using the command line:

sudo yum update
sudo yum install mysql-server

Once the installation is complete, start the MySQL service and set it to start automatically upon system boot:

sudo systemctl start mysqld
sudo systemctl enable mysqld

Securing the Installation

MySQL includes a script for securing the installation, which helps you set up basic security measures such as strong passwords, removal of anonymous users, disabling remote root access, and deletion of test databases. Run this script using:

sudo mysql_secure_installation

Follow the on-screen prompts to set a secure password for the root user and apply the recommended security settings.

Setting Up the Firewall

CentOS 7 uses firewalld for firewall management. To enhance the security of your MySQL server, it is crucial to allow only necessary network traffic and block others. If your application is hosted on the same server as MySQL, you may not need to enable remote access to the database. For local access, you don't need to make any changes to the firewall settings. However, to allow remote access, use:

sudo firewall-cmd --permanent --zone=public --add-service=mysql
sudo firewall-cmd --reload

Setting Up Data Transfer Encryption

To secure data transmitted between your server and MySQL clients, it is recommended to set up SSL encryption. MySQL supports SSL encryption for all data transmitted between the server and clients. Setting up SSL requires the creation of SSL certificates and configuring MySQL server to use them.

Regular Updates and Backups

Keeping your system and software up to date is a fundamental security measure. Regularly run:

sudo yum update

To ensure the protection of your data, it is also essential to regularly back up your database. Mysqldump is a useful tool for creating backups of your databases:

mysqldump -u root -p [database_name] > database_backup.sql

 

Securing a MySQL server is a complex process that requires attention to detail and ongoing adjustments. By following the steps outlined above and continually monitoring and updating your security measures, you can significantly enhance the security of your database on CentOS 7. It's important to recognize that no system is entirely impervious, but with the right approach and continuous improvement of security practices, you can minimize risks.