mysql handlersocket config

Question

I am trying to configuration a handlersocket plugin. I install the plugin and it is visible in mysql by show plugins; DAEMON handlersocket.so but I can't reach the needed variable in mysql.

• this is my.cnf
• next, i restart mysql: restart mysql
• and than show variable list in mysql:mysql variables

And as you can see there no needed variables set

I am using:

ubuntu 16.04 tls mariadb