提示如下
2059 - Authentication plugin 'caching_sha2_password' cannot be loaded

解决方法

[root@VM_0_10_centos ~]# mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 9
Server version: 8.0.19 MySQL Community Server - GPL

Copyright (c) 2000, 2020, 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> use mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select user,plugin from user where user='root';
+------+-----------------------+
| user | plugin                |
+------+-----------------------+
| root | caching_sha2_password |
+------+-----------------------+
1 row in set (0.00 sec)

mysql> 
mysql> alter user 'root'@'%' identified with mysql_native_password by 'ilovebaby520';
Query OK, 0 rows affected (0.01 sec)

mysql> select user,plugin from user where user='root';
+------+-----------------------+
| user | plugin                |
+------+-----------------------+
| root | mysql_native_password |
+------+-----------------------+
1 row in set (0.00 sec)