5.7.27版本mysql新增用户

　　因为我们目前只有root，所以只能先用root登陆mysql，再新增用户：

$ bin/mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 3
Server version: 5.7.27 MySQL Community Server (GPL)

Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.

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> insert into mysql.user(Host,User,ssl_cipher,x509_issuer,x509_subject) values('localhost', 'wlf','','','');
Query OK, 1 row affected (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

　　接着我们给新用户wlf设置密码：

mysql> set password for 'wlf'@'localhost' = password('wlf123');
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

　　然后我们新建数据库，并给wlf用户赋予权限，登陆口令跟wlf的密码一致：

mysql> create database nacos_config;
Query OK, 1 row affected (0.00 sec)

mysql> grant all privileges on nacos_config.* to wlf@localhost identified by 'wlf123';
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

　　用wlf登陆后查看数据库，发现nacos_config已经建好了

[wlf@zjhz-cmread-test188 mysql]$ bin/mysql -u wlf -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 13
Server version: 5.7.27 MySQL Community Server (GPL)

Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.

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> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| nacos_config       |
+--------------------+
2 rows in set (0.00 sec)