How Can I Fix the \'Authentication Method Unknown to the Client\' Error When Connecting phpMyAdmin to MySQL 8.0?

Navigating phpMyAdmin's Compatibility with MySQL 8.0

In the realm of database management, phpMyAdmin remains a sought-after tool. However, as MySQL progresses to its latest version, 8.0, users may encounter connectivity hurdles with phpMyAdmin.

Error Encountered:

When attempting to access phpMyAdmin, users often face the following error:

#2054 - The server requested authentication method unknown to the client

This error stems from the enhanced security measures employed in MySQL 8.0, which introduce a stronger password hashing mechanism.

Solution:

To resolve this issue, you must alter the authentication method specified for the root user within the MySQL instance:

1. Log into the MySQL console as the root user:

root@9532f0da1a2a:/# mysql -u root -pPASSWORD

2. Change the authentication plugin:

mysql> ALTER USER root IDENTIFIED WITH mysql_native_password BY 'PASSWORD';

By setting the authentication plugin to 'mysql_native_password,' you enable compatibility with phpMyAdmin.

Docker Environment Solution:

For those utilizing Docker containers:

docker run --name mysql -e MYSQL_ROOT_PASSWORD=PASSWORD -p 3306:3306 -d mysql:latest

docker exec -it mysql bash

mysql -u root -pPASSWORD

ALTER USER root IDENTIFIED WITH mysql_native_password BY 'PASSWORD';

exit

exit

docker run --name phpmyadmin -d --link mysql:db -p 8080:80 phpmyadmin/phpmyadmin:latest

Additional Considerations:

mysql/mysql-server docker image:

For this docker image, simply uncomment the following line in /etc/my.cnf:

# default-authentication-plugin=mysql_native_password

Alternatively, the following workaround commands can be used:

docker run --name mysql -e MYSQL_ROOT_PASSWORD=PASSWORD -e MYSQL_ROOT_HOST=% -p 3306:3306 -d mysql/mysql-server:latest
docker exec -it mysql sed -i -e 's/# default-authentication-plugin=mysql_native_password/default-authentication-plugin=mysql_native_password/g' /etc/my.cnf
docker stop mysql; docker start mysql
docker run --name phpmyadmin -d --link mysql:db -p 8080:80 phpmyadmin/phpmyadmin:latest

default_authentication_plugin:

Updated solution (09/13/2021):

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';

N.B: Ensure to include the quotes.

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