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MySQL 5.7 インストール後のrootパスワードについて(ubuntu)

以前はインストール中にrootパスワードの入力があったのに、インストール後に設定することになったみたいなので作業内容をメモしておこうと思います。

aptでインストール

$ sudo apt install mysql-server

インストール後、「mysql_secure_installation」を実行

$ sudo mysql_secure_installation

「VALIDATE PASSWORD PLUGIN」を使用するかの確認([y]を選択)

Securing the MySQL server deployment.

Connecting to MySQL using a blank password.

VALIDATE PASSWORD PLUGIN can be used to test passwords
and improve security. It checks the strength of password
and allows the users to set only those passwords which are
secure enough. Would you like to setup VALIDATE PASSWORD plugin?

Press y|Y for Yes, any other key for No:y

(パスワード強度のポリシー([0] のLOW選択)

There are three levels of password validation policy:

LOW    Length >= 8
MEDIUM Length >= 8, numeric, mixed case, and special characters
STRONG Length >= 8, numeric, mixed case, special characters and dictionary                 file

Please enter 0 = LOW, 1 = MEDIUM and 2 = STRONG: 0

rootパスワード設定

Please set the password for root here.

New password: [設定するパスワードを入力]

Re-enter new password: [設定するパスワードを再入力]

Estimated strength of the password: 100
Do you wish to continue with the password provided?(Press y|Y for Yes, any other key for No) : y

anonymousユーザーを削除するか?([y]を選択)

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? (Press y|Y for Yes, any other key for No) : y
Success.

rootで外部から接続可能とするか?([y]を選択)

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? (Press y|Y for Yes, any other key for No) : y
Success.

デフォルトの「test」データベースを削除するか。([y]を選択)

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? (Press y|Y for Yes, any other key for No) : y
- Dropping test database...
Success.

- Removing privileges on test database...
Success.

テーブルをリロードするか。([y]を選択)

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

Reload privilege tables now? (Press y|Y for Yes, any other key for No) : y
Success.

All done!

*** 接続確認

$ sudo mysql -uroot -p
Enter password: [設定したパスワードを入力]
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 18
Server version: 5.7.33-0ubuntu0.16.04.1 (Ubuntu)

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

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

mysql> exit
Bye