"Authentication plugin 'caching_sha2_password' - mysql

Question

I'm new to MySql environment and installed :
MySQL with the following commands:
sudo apt-get update
sudo apt-get install mysql-server
mysql_secure_installation
and also installed mysql workbench.
But when I'm trying to connect my localhost getting the follow error:
"Authentication plugin 'caching_sha2_password' cannot be loaded: /usr/lib/mysql/plugin/caching_sha2_password.so: cannot open shared object file: No such file or directory"
and even this is the first time I'm posting a question in stackoverflow, sorry for my presentation errors and syntax.

Answer 1

So I found the reason for that error message (at least for my case).
It's because MySQL as of version 8.04 and onwards uses caching_sha2_password as default authentication plugin where previously mysql_native_password has been used.
This obviously causes compatibility issues with older services that expect mysql_native_password authentication.
Solutions:
Check for an updated version of the client service you are
using (most recent workbench for instance).
Downgrade the MySQL Server to a version below that change.
Change the authentication plugin on a per user basis (I didn't find a global option, maybe there exists one though).
Now regarding option 3 this is as simple as altering the user:
ALTER USER user
IDENTIFIED WITH mysql_native_password
BY 'pw';
or when creating the user:
CREATE USER 'username'#'localhost' IDENTIFIED WITH mysql_native_password BY 'password';
See MySQL Server Blog
See Oracle

Answer 2

Some more details coming here:
That caching_sha2_password plugin is the new default authentication plugin on MySQL 8 server. Only the libmysql library from that MySQL 8 distribution owns this plugin, and it is built statically into libmysql - the C-connector for various clients. That caching_sha2_password is not available separately for downloading.
This is the very first time that libmysql has an important plugin statically included. And this causes any other libmysql (including libmariadb and also older libmysql's) not to connect to MySQL 8 with a user which is defined to use that caching_sha2_password authentication.
I just hope that the guys from MariaDB are so nice to also include that caching_sha2_password in their libmariadb, to restore the drop-in-compatibility between MySQL and MariaDB.
From MySQL's server blog:
Support for caching_sha2_password was added in MySQL 8.0.3. Older
versions of libmysqlclient do not support this plugin. So, although
client tools that use libmysqlclient older than one available with
MySQL 8.0.3 can connect to MySQL 8.0.4 server using users that use
other authentication plugins such as mysql_native_password or
sha256_password, such client cannot connect to MySQL 8.0.4 server
using users which require caching_sha2_password support. For an
upgraded database, it means connecting using an existing user account
should not face any issues.

Answer 3

In the my.cnf file add the following line:
default-authentication-plugin=mysql_native_password
then restart the server.

Answer 4

The latest MYSQL versions have 'caching_sha2_password' as the default authentication type. Which does not allow remote connections to MYSQL and results in caching_sha2_password plugin error.
I have fixed it using
ALTER USER 'yourusername'#'localhost' IDENTIFIED WITH mysql_native_password BY 'yourpassword';
Now it allows your user to access MySQL from localhost.
If you want to access MySQL from multiple remote hosts then do the following,
**
ALTER USER 'yourusername'#'%' IDENTIFIED WITH mysql_native_password BY
'youpassword';
**
After every alter command in SQL run the following to take effect.
FLUSH PRIVILEGES;
OR restart MySQL server

Answer 5

Login to Mysql or your workbench, and run the following statement for any user who has this issue:
alter USER 'YOURUSERFORMYSQL'#'localhost' identified with mysql_native_password by 'YOURPASSWORD'
In case you did not create the user yet, you can activate this feature during the user creation.
create USER 'NEWUSER'#'localhost' identified with mysql_native_password by 'NEWPASSWORD'