Install MySQL on Ubuntu

Ubuntu： 18.04

MySQL： 5.7

Install MySQL

sudo apt install mysql-server

執行 MySQL secure script，啟用相關安全設定

sudo mysql_secure_installation

mysql_secure_installation 可以設定 密碼強度控制、拒絕遠端 root 登入 等等的安全性設定。

Notice：如果你可能還需要透過 root 帳號做事情(例如透過 phpMyAdmin 操作)，那就要更換一下 root 帳號的認證模式並設定密碼。

修改 root 密碼
進入 MySQL command line

sudo mysql

查詢帳號狀態

mysql>SELECT user,authentication_string,plugin,host FROM mysql.user;

+------------------+-------------------------------------------+-----------------------+-----------+
| user             | authentication_string                     | plugin                | host      |
+------------------+-------------------------------------------+-----------------------+-----------+
| root             |                                           | auth_socket           | localhost |
| mysql.session    | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | mysql_native_password | localhost |
| mysql.sys        | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | mysql_native_password | localhost |
| debian-sys-maint | *E1CA7F7DEA9340570136C36064CA2BA275014159 | mysql_native_password | localhost |
+------------------+-------------------------------------------+-----------------------+-----------+

修改 root 認證模式並更改密碼

# 換成使用 mysql_native_password 認證
mysql>ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';

# Reload 權限設定
mysql>FLUSH PRIVILEGES;