Unable to change innodb_log_file_size in MariaDB Galera Cluster 10.0
In my experience setting up MariaDB 10.1 cluster, this behavior happens due to an override cnf file.

I had the same problem, that changing a setting in my.cnf and restarting mysql but the change was ignored. I found on ubuntu there is /etc/mysql/conf.d/mariadb-enterprise.cnf which overrides many settings. I comment out in the override file the value I want to change and then the value I put in my.cnf is used.