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MariaDB 10.3 : インストール
2019/10/31
 
MariaDB をインストールして、データベースサーバーを構築します。
[1] MariaDB をインストールして起動します。
[root@www ~]#
dnf module -y install mariadb:10.3
[root@www ~]#
vi /etc/my.cnf.d/mariadb-server.cnf
# 21行目:デフォルトの文字コードを追記

# 未指定の場合のデフォルトは [latin1]

# 絵文字等 4バイト長の文字を扱う場合は [utf8mb4] を指定

[mysqld]
character-set-server=utf8
[root@www ~]#
systemctl enable --now mariadb

[2] Firewalld を有効にしている 且つ リモートホストからも MariaDB を利用する場合はサービスの許可が必要です。MariaDB は [3306/TCP] を使用します。
[root@www ~]#
firewall-cmd --add-service=mysql --permanent

success
[root@www ~]#
firewall-cmd --reload

success
[3] MariaDB の初期設定です。
[root@www ~]#
mysql_secure_installation


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):
OK, successfully used password, moving on...

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

# root パスワードを設定
Set root password? [Y/n] y
New password:
Re-enter new password:
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.

# 匿名ユーザーは削除する
Remove anonymous users? [Y/n] y
 ... Success!

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

# root のリモートログインは無効とする
Disallow root login remotely? [Y/n] y
 ... 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.

# テストデータベースは削除する
Remove test database and access to it? [Y/n] y
 - 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.

# 特権情報をリロードする
Reload privilege tables now? [Y/n] y
 ... 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!

# MariaDB に root ユーザーで接続

[root@www ~]#
mysql -u root -p

Enter password:    
# 設定したパスワードで認証

Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 17
Server version: 10.3.11-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

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

# ユーザー情報一覧表示
MariaDB [(none)]> select user,host,password from mysql.user; 
+------+-----------+-------------------------------------------+
| user | host      | password                                  |
+------+-----------+-------------------------------------------+
| root | localhost | *xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |
| root | 127.0.0.1 | *xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |
| root | ::1       | *xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |
+------+-----------+-------------------------------------------+
3 rows in set (0.000 sec)

# データベース一覧表示
MariaDB [(none)]> show databases; 
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
+--------------------+
3 rows in set (0.00 sec)

# テストデータベース作成
MariaDB [(none)]> create database test_database; 
Query OK, 1 row affected (0.000 sec)

# テストデータベースにテストテーブル作成
MariaDB [(none)]> create table test_database.test_table (id int, name varchar(50), address varchar(50), primary key (id)); 
Query OK, 0 rows affected (0.108 sec)

# テストテーブルにデータ投入
MariaDB [(none)]> insert into test_database.test_table(id, name, address) values("001", "CentOS", "Hiroshima"); 
Query OK, 1 row affected (0.036 sec)

# テストテーブル表示
MariaDB [(none)]> select * from test_database.test_table; 
+----+--------+-----------+
| id | name   | address   |
+----+--------+-----------+
|  1 | CentOS | Hiroshima |
+----+--------+-----------+
1 row in set (0.000 sec)

# テストデータベース削除
MariaDB [(none)]> drop database test_database; 
Query OK, 1 row affected (0.111 sec)

MariaDB [(none)]> exit
Bye
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