CDbConnection failed to open the DB connection mysql 8



While accessing web configured with mysql 8 and php and you see the following error:

 CDbConnection failed to open the DB connection: SQLSTATE[HY000] [2054] The server requested authentication method unknown to the client

 OR 

 PHP Fatal error:  Uncaught PDOException: PDO::__construct(): The server requested authentication method unknown to the client [caching_sha2_password] 

 It maybe due to PHP devs might have not implemented the MySQL's 8.0 connection protocol ( auth with caching_sha2_password ) within the newer PHP versions.
If you want to use mysql >= 8 and you dont care about caching_sha2_password, 

 If you are running a fresh install of mysql 8, just select the second option as shown in the image.

Otherwise, you need to configure MySQL 8.0 to run in mysql_native_password mode.
As it can't configured in my.cnf,

 change the user profile as:-

 
ALTER USER 'mysqlUsername'@'localhost' IDENTIFIED WITH mysql_native_password BY 'mysqlUsernamePassword';
So that the mysql user using for connection is configured with native password mode. And then you can verify that the error is resolved.




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