删除 Mysql
首先在系统终端中查看MySQL的依赖项，运行命令：
dpkg --list|grep mysql 查看mysql 相关的资源包
删除命令如下：
- sudo apt-get remove mysql-common
- sudo apt-get autoremove --purge mysql-apt-config
安装 mysql
- sudo apt-get update
- sudo apt-get install mysql-server
检查mysql服务状态 - systemctl status mysql.service
ubuntu20 mysql 修改初始密码
参考 https://www.digitalocean.com/community/tutorials/how-to-reset-your-mysql-or-mariadb-root-password-on-ubuntu-20-04
停止服务器
- sudo systemctl stop mysql
Configuring MySQL to Start Without Grant Tables
sudo systemctl edit mysql
[Service]
ExecStart=
ExecStart=/usr/sbin/mysqld --skip-grant-tables --skip-networking
Press CTRL-x to exit the file, then Y to save the changes that you made, then ENTER to confirm the file name
- sudo systemctl daemon-reload
- sudo systemctl start mysql
- sudo mysql -u root
Changing the Root Password
mysql > FLUSH PRIVILEGES;
mysql > ALTER USER 'root'@'localhost' IDENTIFIED WITH caching_sha2_password BY 'new_password';
设置密码会遇到 : Your password does not satisfy the current policy requirements , 解决方案
原因是密码不符合规定，如下为规则：
- LOW Length >= 8 characters.
- MEDIUM Length >= 8, numeric, mixed case, and special characters.
- STRONG Length >= 8, numeric, mixed case, special characters and dictionary file.
查看当前密码强度：
mysql > SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+--------+
| Variable_name | Value |
+--------------------------------------+--------+
| validate_password.check_user_name | ON |
| validate_password.dictionary_file | |
| validate_password.length | 8 |
| validate_password.mixed_case_count | 1 |
| validate_password.number_count | 1 |
| validate_password.policy | MEDIUM |
| validate_password.special_char_count | 1 |
+--------------------------------------+--------+
7 rows in set (0.02 sec)
# 更改root密码
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH caching_sha2_password BY 'Password123#@!';
Query OK, 0 rows affected (0.00 sec)
# 设置口令强度
mysql> SET GLOBAL validate_password.policy = 0;
Query OK, 0 rows affected (0.01 sec)
# 再次查看密码强度
mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+-------+
| Variable_name | Value |
+--------------------------------------+-------+
| validate_password.check_user_name | ON |
| validate_password.dictionary_file | |
| validate_password.length | 8 |
| validate_password.mixed_case_count | 1 |
| validate_password.number_count | 1 |
| validate_password.policy | LOW |
| validate_password.special_char_count | 1 |
+--------------------------------------+-------+
7 rows in set (0.00 sec)
# 其实前面稍微复杂点的步骤可以省略，主要用于学习
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH caching_sha2_password BY '12345678';
恢复正常设置，不然无法建立账户
$ sudo systemctl revert mysql
Removed /etc/systemd/system/mysql.service.d/override.conf.
Removed /etc/systemd/system/mysql.service.d.
$ sudo systemctl daemon-reload
$ sudo systemctl revert mysql
创建用户
如果出现密码强度问题，使用上述方法进行设置
使用刚刚更改过的密码登录 mysql， 创建用户
mysql> create user 'hive'@'localhost' identified by '12345678';
Query OK, 0 rows affected (0.01 sec)
