mysql8 デフォルト認証方式「caching_sha2_password」を変更する

mysql --help | grep my.cnf

<出力結果>
order of preference, my.cnf, $MYSQL_TCP_PORT,
/etc/my.cnf /etc/mysql/my.cnf ~/.my.cnf

$ sudo cat /etc/my.cnf

<出力結果>
cat: /etc/my.cnf: そのようなファイルやディレクトリはありません

$ sudo cat /etc/mysql/my.cnf
<出力結果>
#
# The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

#
# * IMPORTANT: Additional settings that can override those from this file!
#   The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/mysql.conf.d/

!includedir /etc/mysql/mysql.conf.d/

cd /etc/mysql/mysql.conf.d/

sudo nano mysqld.cnf

default_authentication_plugin=mysql_native_password

sudo service mysql restart

mysql> show variables like 'default_authentication_plugin';

<出力結果>
+-------------------------------+-----------------------+
| Variable_name                 | Value                 |
+-------------------------------+-----------------------+
| default_authentication_plugin | mysql_native_password |
+-------------------------------+-----------------------+