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晕，找了好半天终于找到了，在这里做个笔记。
解决错误：ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
Table of Contents
1.安装
首先使用yum安装MySQL就不用过多说明了。
2.查找初始密码
查找方式：
$ grep 'temporary pass' /var/log/mysqld.log
2018-02-04T06:08:19.158928Z 1 [Note] A temporary password is generated for root@localhost: l#()FqWfy9ih
这里注意，我的密码里带有()括号，那么这样用就不对了
$ mysql -uroot -pl#()FqWfy9ih
bash: 未预期的符号 `(' 附近有语法错误
需要这样用：
$ mysql -uroot -pl#\(\)FqWfy9ih
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 31
Server version: 5.7.24
Copyright (c) 2000, 2018, 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> 成功进入MySQL的命令行。
3.密码修改
mysql> set password for 'root'@'localhost' = password('root');
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
mysql> set global validate_password_length=0;
Query OK, 0 rows affected (0.00 sec)
mysql> set global validate_password_policy=0;
Query OK, 0 rows affected (0.00 sec)
mysql> set password for 'root'@'localhost' = password('root ');
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> exit
Bye
$ 以上命令依次为：
- 修改：密码最小长度策略
- 修改：密码强度检查等级策略，0/LOW、1/MEDIUM、2/STRONG
- 修改密码
4.其他设置
mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root ' WITH GRANT OPTION;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
依次为：
- 开启mysql的root用户远程连接服务(%号即远程连接，IDENTIFIED BY后面跟的密码)
- 刷新