This looks like a lack of support for caching_sha2_password plugin. This is the default in MySQL-8.0.

@WaterZhai, please show output from the SQL; SHOW CREATE USER water; in mysql prompt to verify.

Algorithm for development: https://jira.mariadb.org/browse/CONC-312
https://dev.mysql.com/doc/dev/mysql-server/latest/page_caching_sha2_authentication_exchanges.html

这个是什么？

Don't use Chinese here.
Here is issue tracker for maintainer.
Not forum for users.

@WaterZhai I can't read Chinese. Your output confirms my theory that caching_sha2_password is required. Thankyou. This is now a feature request in #651.

@methane, its a rather larger feature request. I can help. Like, #583, it seems hard to avoid an extra dependency.