修改配置：

vim /etc/my.cnf
[mysqld]
basedir=/home/mysql
datadir=/home/mysql/data

port = 3306
user = mysql
character_set_server=utf8

skip-grant-tables

[client]
default-character-set=utf8

service mysqld start
Starting MySQL. [ OK ]
[root@izm5e5xf4ylewnqwanhz1mz bin]# mysql -uroot -p mysql
Enter password:
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.18 MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MySQL [mysql]>
MySQL [mysql]>
MySQL [mysql]>
MySQL [mysql]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.01 sec)

MySQL [mysql]> update user set password=password("mysql") where user='root';
ERROR 1054 (42S22): Unknown column 'password' in 'field list'
MySQL [mysql]> update mysql.user set authentication_string=password('root') where user='root' ;
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 1