centos - MySQL doesn't use the options in my.cnf -

i use virtual machine centos on work. able work it's mysql 5.6 without trouble, virtual machine cloned (literally cloned) create 1 on same server. since then, original virtual machine not use options defined on [mysqld] /etc/my.cnf file. i'm trying change server-id option of machines can set db replication on them, problem persists on both machines (and replication can't set server-id=0, default value it's assuming).

obs: before machine cloned, had no problems @ , succeeded create replication between original vm , computer.

any thoughts?