I just started learning about cluster so I don't have much knowledge if question is not appropriate please forgive me.
I have a 3 node InnoDB cluster running .suppose if I want to tune my server by changing the value of the innodb_buffer_pool_size variable or let say I want to add a new variable in configuration file do I need to change the my.cnf file of every server or is there any simple way I can achieve this.
and how do I change the server system variable so that the setting will be replicated to other servers too?