Grafana configure login without using password

How to configure web login without using password.I find this configure item in grafana.ini but it can’t solve problem.

This solution can’t solve problem too.
Login requires a password when I use the following solution.
$ sudo sqlite3 /var/lib/grafana/grafana.db

sqlite> update user set password = NULL, salt = ‘F3FAxVm33R’ where login = ‘admin’;

There is a section in the ini file to enable anonymous auth.