Redirecting to /bin/systemctl start mysqld.service [root@localhost program]#
使用service mysqld status查看mysql启动状态，显示结果如下。
[root@localhost program]# service mysqld status Redirecting to /bin/systemctl status mysqld.service ● mysqld.service - MySQL Server Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled) Active: active (running) since Tue 2021-11-16 19:32:35 CST; 41s ago Docs: man:mysqld(8) http://dev.mysql.com/doc/refman/en/using-systemd.html Process: 17884 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS) Main PID: 17963 (mysqld) Status: "Server is operational" CGroup: /system.slice/mysqld.service └─17963 /usr/sbin/mysqld
Nov 16 19:32:29 localhost systemd[1]: Starting MySQL Server... Nov 16 19:32:35 localhost systemd[1]: Started MySQL Server.
[root@localhost program]# grep "A temporary password" /var/log/mysqld.log 2021-11-16T11:32:31.731757Z 6 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: HE)ZBV0.q:r0
[root@localhost program]# mysql -uroot -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 9 Server version: 8.0.27
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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>
修改密码
由于当前密码是Mysql自动生成的，所以在后续操作中，Mysql会提示让我们修改
执行修改命令时，会得到如下提示。
mysql> alter user 'root'@'localhost' IDENTIFIED BY '123456'; ERROR 1819 (HY000): Your password does not satisfy the current policy requirements mysql>
执行 show variables like 'validate_password.%';可以查看安全策略设置，但是由于使用初始密码，mysql会给出下面这个提示。
mysql> show variables like 'validate_password.%'; ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement. mysql>
于是，我们只能先修改成一个稍微复杂一点的
mysql> alter user 'root'@'localhost' IDENTIFIED BY 'root@123456!Q@W'; Query OK, 0 rows affected (0.01 sec)
再次执行 show variables like 'validate_password.%';，得到如下信息
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 (0.01 sec)
validate_password.length 是密码的最小长度，默认是8，我们把它改成6 输入：set global validate_password.length=6;
validate_password.policy 验证密码的复杂程度，我们把它改成0 输入：set global validate_password.policy=0;
validate_password.check_user_name 用户名检查，用户名和密码不能相同，我们也把它关掉 输入：set global validate_password.check_user_name=off;
修改完成后，验证修改结果如下。
mysql> show variables like 'validate_password.%'; +--------------------------------------+-------+ | Variable_name | Value | +--------------------------------------+-------+ | validate_password.check_user_name | OFF | | validate_password.dictionary_file | | | validate_password.length | 6 | | 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 (0.01 sec)
再次执行修改密码的语句，就可以修改成功了！
mysql> alter user 'root'@'localhost' IDENTIFIED BY '123456'; Query OK, 0 rows affected (0.01 sec)
