Re: how to setup master, primary slave master and slaves

[Rick James]

SHOW PROCESSLIST;
You should see one replication thread per slave on each master (R is a master).
You should see two replication threads on each slave (R is a slave).
If not; that will be a clue.

What is the "user" being used for replication? Double check it by looking in the file master.info (on slaves).

SHOW GRANTS FOR "repl_user"; -- this must exist on masters (M & R)