Mariadb（データベース）

自宅サーバー構築メモ
2026.05.27

MariaDBインストール

[root@almalinux ~]# dnf -y install mariadb-server　※ mariadb-serverインストール
完了しました!

MariaDB設定

[root@almalinux ~]# vi /etc/my.cnf.d/mariadb-server.cnf　※ MariaDBサーバー設定ファイル編集
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
log-error=/var/log/mariadb/mariadb.log
pid-file=/run/mariadb/mariadb.pid
character-set-server = utf8mb4　←　追加(MariaDBサーバーの文字コードをutf8mb4にする)

[root@almalinux ~]# vi /etc/my.cnf.d/client.cnf　※ MariaDBクライアント設定ファイル編集
[client]
default-character-set=utf8mb4　←　追加(MariaDBサーバーの文字コードをutf8mb4にする)

MariaDB起動

[root@almalinux ~]# systemctl start mariadb　※ MariaDB起動

[root@almalinux ~]# systemctl enable mariadb　※ MariaDB自動起動設定
Created symlink /etc/systemd/system/mysql.service → /usr/lib/systemd/system/mariadb.service.
Created symlink /etc/systemd/system/mysqld.service → /usr/lib/systemd/system/mariadb.service.
Created symlink /etc/systemd/system/multi-user.target.wants/mariadb.service → /usr/lib/systemd/system/mariadb.service.

MariaDB初期設定

[root@almalinux ~]# mysql_secure_installation　※ MariaDB初期設定

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

In order to log into MariaDB to secure it, we'll need the current
password for the root user. If you've just installed MariaDB, and
haven't set the root password yet, you should just press enter here.

Enter current password for root (enter for none): 　←　空ENTER
OK, successfully used password, moving on...

Setting the root password or using the unix_socket ensures that nobody
can log into the MariaDB root user without the proper authorisation.

You already have your root account protected, so you can safely answer 'n'.

Switch to unix_socket authentication [Y/n]  　←　空ENTER
Enabled successfully!
Reloading privilege tables..
 ... Success!

You already have your root account protected, so you can safely answer 'n'.

Change the root password? [Y/n]   　←　空ENTER
New password: 　←　任意のrootパスワードを応答
Re-enter new password: 　←　上記と同じパスワードを応答(確認)
Password updated successfully!
Reloading privilege tables..
 ... Success!


By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n]    　←　空ENTER
 ... Success!

Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] 　←　空ENTER(リモートからのrootログイン禁止)
 ... Success!

By default, MariaDB comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] 　←　空ENTER(testデータベース削除)
 - Dropping test database...
 ... Success!
 - Removing privileges on test database...
 ... Success!

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] 　←　空ENTER
 ... Success!

Cleaning up...

All done!  If you've completed all of the above steps, your MariaDB
installation should now be secure.

Thanks for using MariaDB!

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