8、进入数据库检查：
[mysql@localhost ~]$ /mysql/mysql5718/bin/mysql -u root -p --socket=/mysql/data/mysql.sock
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.7.18-log MySQL Community Server (GPL)
Copyright (c) 2000, 2017, 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> set password='123456'; （因为刚才使用的密码是个默认的登录密码，所以我们要修改）
mysql> flush privileges;