Ubuntu 22.04にMySQL 8をインストールして使用する方法

apt update -y  
apt upgrade -y

apt install mysql-server -y

mysql --version

mysql  Ver 8.0.30-0ubuntu0.22.04.1 for Linux on x86_64 ((Ubuntu))

systemctl start mysql

systemctl stop mysql

systemctl status mysql

? mysql.service - MySQL Community Server
     Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
     Active: active (running) since Sun 2022-08-21 12:47:24 UTC; 28s ago
    Process: 26157 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
   Main PID: 26185 (mysqld)
     Status: "Server is operational"
      Tasks: 41 (limit: 2242)
     Memory: 359.8M
        CPU: 1.383s
     CGroup: /system.slice/mysql.service
             ??26185 /usr/sbin/mysqld

Aug 21 12:47:23 ubuntu2204 systemd[1]: Starting MySQL Community Server...
Aug 21 12:47:24 ubuntu2204 systemd[1]: Started MySQL Community Server.

ss -antpl | grep -i mysql

LISTEN 0      70         127.0.0.1:33060      0.0.0.0:*    users:(("mysqld",pid=26185,fd=21))                       
LISTEN 0      151        127.0.0.1:3306       0.0.0.0:*    users:(("mysqld",pid=26185,fd=23))                       

mysql_secure_installation

Securing the MySQL server deployment.

Connecting to MySQL using a blank password.

VALIDATE PASSWORD COMPONENT 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 component?

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

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
Please set the password for root here.

New password: 

Re-enter new password: 

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
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.

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.

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.

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! 

mysql

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password by 'securepassword';

mysql> FLUSH PRIVILEGES;

mysql> EXIT;

mysql -u root -p

Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 13
Server version: 8.0.30-0ubuntu0.22.04.1 (Ubuntu)

Copyright (c) 2000, 2022, 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> 

mysql> CREATE DATABASE db1;

mysql> SHOW databases;

+--------------------+
| Database           |
+--------------------+
| db1                |
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+

mysql> USE db1;

mysql> CREATE USER 'dbuser'@'%' IDENTIFIED BY 'password';

mysql> GRANT ALL PRIVILEGES ON *.* TO 'dbuser'@'%' WITH GRANT OPTION;

mysql> FLUSH PRIVILEGES;

mysql> EXIT;

apt remove mysql-server --purge

apt autoremove