install plugin pam soname 'auth_pam.so';
create user test_pam identified via pam using 'mariadb_mtr';
create user pam_test;
grant proxy on pam_test to test_pam;
show variables like 'pam%';
Variable_name	Value
pam_use_cleartext_plugin	ON
drop user test_pam;
drop user pam_test;
uninstall plugin pam;