データベースサーバー構築(MariaDB)(CentOS8)

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※Webサーバー+PHP が構築済であること。phpMyAdminを導入に必要なパッケージもインストールします。

• MySQLの文字コードをutf8mb4に設定しています。

必要なパッケージのインストール

MySQLインストール

[root@host3 ~]# dnf -y install mariadb-server

php-mysqlndをインストール

[root@host3 ~]# dnf -y install php-mysqlnd

MySQL設定

mariadb-server.cnf 設定ファイル編集

[root@host3:wq ~]# vi /etc/my.cnf.d/mariadb-server.cnf

[mysqld]
character-set-server = utf8mb4　←　追加

client.cnf 設定ファイル編集

[root@host3 ~]# vi /etc/my.cnf.d/client.cnf

[client]
default-character-set = utf8mb4　←　追加

mysql-clients.cnf 設定ファイル編集

[root@host3 ~]# vi /etc/my.cnf.d/mysql-clients.cnf

[mysql]
default-character-set = utf8mb4　←　追加

[mysqldump]
default-character-set = utf8mb4　←　追加

MariaDB起動

[root@host3 ~]# systemctl start mariadb　　←　MariaDB起動

[root@host3 ~]# systemctl enable mariadb　　←　MariaDB自動起動設定

[root@host3 ~]# systemctl status mariadb　　←　MariaDBステータス
● mariadb.service - MariaDB 10.3 database server
  Loaded: loaded (/usr/lib/systemd/system/mariadb.service; enabled; vendor preset: >
  Active: active (running) since Tue 2020-03-10 22:05:21 JST; 36s ago
    Docs: man:mysqld(8)
          https://mariadb.com/kb/en/library/systemd/
Main PID: 3370 (mysqld)
  Status: "Taking your SQL requests now..."
   Tasks: 30 (limit: 26213)
  Memory: 84.2M
  CGroup: /system.slice/mariadb.service
          mq3370 /usr/libexec/mysqld --basedir=/usr

MySQL初期設定

[root@host3 ~]# mysql_secure_installation　←　MySQL初期設定

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

In order to log into MySQL to secure it, we'll need the current
password for the root user.  If you've just installed MySQL, and
you haven't set the root password yet, the password will be blank,
so 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 ensures that nobody can log into the MySQL
root user without the proper authorisation.

Set root password? [Y/n] 　←　空ENTER(rootパスワード設定)
New password: 　←　rootパスワード応答
Re-enter new password: 　←　rootパスワード応答(確認)
Password updated successfully!
Reloading privilege tables..
 ... Success!

By default, a MySQL installation has an anonymous user, allowing anyone
to log into MySQL 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(匿名ユーザー削除)
 ... 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, MySQL 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 MySQL
installation should now be secure.

Thanks for using MariaDB!