MySQL Authentication Method "caching_sha2_password"

A tutorial example is provided on how to create a new user account with 'mysql_native_password' authentication method to avoid the 'caching_sha2_password' error with mysqli_connect() method.

If you are running MySQL Server 8.0 with the default configuration and try to access it with mysqli_connect() method in a PHP script, you will get the error:

PHP Warning:  mysqli_connect(): The server requested authentication
method unknown to the client [caching_sha2_password]
in C:\herong\MySqlTest.php on line 5

Here is why. By default, all user accounts on MySQL Server 8.0 are created with the new authentication method called: caching_sha2_password. Unfortunately, caching_sha2_password is not supported by the "mysqli" module yet.

One solution is to change the user's authentication method back to "mysql_native_password", or create a new user with "mysql_native_password".

Here is how to create a new user "herong" with the old authentication method, "mysql_native_password".

herong> %mysql%\bin\mysql.exe --user=root --password
Enter password: TopSecret

mysql> WITH mysql_native_password BY 'TopSecret';
Query OK, 0 rows affected (0.01 sec)

I updated the MySqlTest.php with the new user account and test it again:

herong> type MySqlTest.php
#- MySqlTest.php
#  Copyright (c) 2005 All Rights Reserved.
#   $con = mysqli_connect('localhost','root','TopSecret');
   $con = mysqli_connect('localhost','herong','TopSecret');
   print "MySQL server info = ".mysqli_get_server_info($con)."\n";
   print "MySQL status = ".mysqli_stat($con)."\n";

herong> \local\php\php MySqlTest.php
MySQL server info = 8.0.16
MySQL status = Uptime: 19560  Threads: 3  Questions: 16
Slow queries: 0  Opens: 161  Flush tables: 3
Open tables: 65  Queries per second avg: 0.000

Cool, this confirmed that my PHP engine is configured correctly to access my MySQL Server 8.0.

Table of Contents

 About This Book

 Introduction of SQL

 MySQL Introduction and Installation

 Introduction of MySQL Programs

PHP Programs and MySQL Server

 Configuring PHP for MySQL Server Access

MySQL Authentication Method "caching_sha2_password"

 mysqli_connect() and Other MySQL Functions

 MySqlLoop.php - MySQL Functions Test

 Perl Programs and MySQL Servers

 Java Programs and MySQL Servers

 Datatypes and Data Literals

 Operations and Expressions

 Character Strings and Bit Strings

 Commonly Used Functions

 Table Column Types for Different Types of Values

 Using DDL to Create Tables and Indexes

 Using DML to Insert, Update and Delete Records

 Using SELECT to Query Database

 Window Functions for Statistical Analysis

 Use Index for Better Performance

 Transaction Management and Isolation Levels

 Locks Used in MySQL

 Defining and Calling Stored Procedures

 Variables, Loops and Cursors Used in Stored Procedures

 System, User-Defined and Stored Procedure Variables

 MySQL Server Administration

 Storage Engines in MySQL Server

 InnoDB Storage Engine - Primary and Secondary Indexes

 Performance Tuning and Optimization

 Bulk Changes on Large Tables

 MySQL Server on macOS

 Installing MySQL Server on Linux

 Connection, Performance and Second Instance on Linux

 Archived Tutorials


 Full Version in PDF/EPUB