From: https://www.digitalocean.com/community/tutorials/how-to-install-mariadb-on-centos-7

Introduction

MariaDBis an open-source database management system, commonly installed as part of the popularLEMP(Linux, Nginx, MySQL/MariaDB, PHP/Python/Perl) stack. It uses a relational database and SQL (Structured Query Language) to manage its data. MariaDB is a fork of MySQL managed by the original MySQL developers. It's designed as a replacement for MySQL, uses some commands that referencemysql, and is the default package on CentOS 7.

In this tutorial, we will explain how to install the latest version of MariaDB on a CentOS 7 server. If you specifically need MySQL, see theHow to Install MySQL on CentOS 7guide. If you're wondering about MySQL vs. MariaDB, MariaDB is the preferred package and should work seamlessly in place of MySQL.

Prerequisites

To follow this tutorial, you will need:

A CentOS 7 with a non-root user withsudoprivileges. You can learn more about how to set up a user with these privileges in theInitial Server Setup with CentOS 7guide.

Step 1 — Installing MariaDB

We'll use Yum to install the MariaDB package, pressingywhen prompted to confirm that we wish to proceed:

sudo yum install mariadb-server

Once the installation is complete, we'll start the daemon with the following command:

sudo systemctl start mariadb

systemctldoesn't display the outcome of all service management commands, so to be sure we succeeded, we'll use the following command:

sudo systemctl status mariadb

If MariaDB has successfully started, the output should contain "Active: active (running)` and the final line should look something like:

Dec 01 19:06:20 centos-512mb-sfo2-01 systemd[1]: Started MariaDB database server.

Next, let's take a moment to ensure that MariaDB starts at boot, using thesystemctl enablecommand, which will create the necessary symlinks.

sudo systemctl enable mariadb

Output

Created symlink from /etc/systemd/system/multi-user.target.wants/mariadb.service to /usr/lib/systemd/system/mariadb.service.

Next, we'll turn our attention to securing our installation.

Step 3 — Securing the MariaDB Server

MariaDB includes a security script to change some of the less secure default options for things like remote root logins and sample users. Use this command to run the security script:

sudo mysql_secure_installation

The script provides a detailed explanation for every step. The first prompts asks for the root password, which hasn't been set so we'll pressENTERas it recommends. Next, we'll be prompted to set that root password, which we'll do.

Then, we'll accept all the security suggestions by pressingYand thenENTERfor the remaining prompts, which will remove anonymous users, disallow remote root login, remove the test database, and reload the privilege tables.

Finally, now that we've secured the installation, we'll verify it's working.

Step 4 — Testing the Installation

We can verify our installation and get information about it by connecting with themysqladmintool, a client that lets you run administrative commands. Use the following command to connect to MariaDB asroot(-u root), prompt for a password (-p), and return the version.

mysqladmin -u root -p version

You should see output similar to this:

Output

mysqladmin  Ver 9.0 Distrib 5.5.50-MariaDB, for Linux on x86_64

Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.

Server version          5.5.50-MariaDB

Protocol version        10

Connection              Localhost via UNIX socket

UNIX socket            /var/lib/mysql/mysql.sock

Uptime:                4 min 4 sec

Threads: 1  Questions: 42  Slow queries: 0  Opens: 1  Flush tables: 2  Open tables: 27  Queries per second avg: 0.172

This indicates the installation has been successful.

Conclusion

In this tutorial, we've installed and secured MariaDB on a CentOS 7 server. To learn more about using MariaDB, this guide tolearning more about MySQL commandscan help. You might also considerimplementing some additional security measures.

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Other

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allow remote connection

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;

FLUSH PRIVILEGES;

sudo firewall-cmd --permanent --add-port=3306/tcp

sudo firewall-cmd --reload