MariaDB インストール

[root@centos ~]# yum -y install mariadb-server

[root@centos ~]# vi /etc/my.cnf
[mysqld]
character-set-server=utf8 ←追加(文字コードをUTF-8とする)

[root@centos ~]# systemctl start mariadb
[root@centos ~]# systemctl enable mariadb
[root@centos ~]# systemctl is-enabled mariadb
enabled

[root@centos ~]# mysql_secure_installation
/usr/bin/mysql_secure_installation: line 379: find_mysql_client: command not found

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
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): ←空エンター
OK, successfully used password, moving on...

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

You already have a root password set, so you can safely answer 'n'.

Set root password? [Y/n] y ←yを入力(mysqlのrootのパスワードを入力しますか？)
New password: ←mysqlのrootパスワードを入力
Re-enter new password: ←mysqlのrootパスワードを再入力
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] y ←yを入力(匿名ユーザーを削除しますか？)
 ... 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] y ←yを入力(rootのリモートログインを無効にしますか？)
 ... 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] y ←yを入力(テストデータベースを削除しますか？)
 - Dropping test database...
ERROR 1008 (HY000) at line 1: Can't drop database 'test'; database doesn't exist
 ... Failed!  Not critical, keep moving...
 - 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] y ←yを入力(特権情報をリロードしますか？)
 ... 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!

[root@centos ~]# mysql -u root -p
Enter password: ←mysqlのrootパスワードを入力
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 46
Server version: 5.5.44-MariaDB MariaDB Server

Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> SELECT user,host FROM mysql.user; ←登録ユーザーを見る
+------+-----------+
| user | host      |
+------+-----------+
| root | 127.0.0.1 |
| root | ::1       |
| root | localhost |
+------+-----------+
3 rows in set (0.00 sec)

MariaDB [(none)]> SHOW DATABASES; ←データベースを見る
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
+--------------------+
3 rows in set (0.00 sec)

MariaDB [(none)]> CREATE DATABASE user_name; ←データベースuser_nameを作成
Query OK, 1 row affected (0.01 sec)

MariaDB [(none)]> GRANT ALTER,CREATE,DELETE,DROP,INSERT,LOCK TABLES,SELECT,UPDATE ON user_name.* TO user_name@localhost IDENTIFIED BY 'user_pass'; ←ユーザーuser_nameを作成
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> EXIT;
Bye

mysql> DROP DATABASE user_name; ←データベースuser_nameを削除

mysql> REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'user_name'@'localhost';
mysql> DELETE FROM mysql.user WHERE user='user_name' and host='localhost';