MySQL Database Replication in Fedora 21
Here is an old instructions for setting up master-master replication for windows but concept is same.
Considering you already have a 3306 instance by default you can follow below steps to setup as well (if above doesn't help)


  
  Make datadir and correct permissions:
  mkdir /var/lib/mysql3307
  chown -R mysql:mysql /var/lib/mysql3307
  Create config 
  cp /etc/my.cnf /etc/my3307.cnf (Correct relevant parameters)
  Install basic auth system / dbs: 
  mysql_install_db --user=mysql --basedir=/usr --datadir=/var/lib/mysql3307 --defaults-file=/etc/my3307.cnf
  Start mysql  mysqld_safe --defaults-file=/etc/my3307.cnf --user=mysql &amp;
  Take fulldump from 3306 instance:  mysqldump -uroot -p --all-databases --master-data=2 | gzip > backup.sql.gz
  Load it to new 3307 instance 
  zcat backup.sql.gz  | mysql -uroot -p --port=3307 --socket=/var/run/mysql/mysqld3307.sock
  Grab binary log co-ordinates from  backup: 
  zcat backup.sql.gz | head -30 | grep -i change
  Create replication user on master: 
  grant replication slave on . to 'repluser'@'%' identified by 'replpass';
  Run change master to on 3307 slave using binlogs take from  step #7: 
  CHANGE MASTER TO MASTER_HOST='localhost', MASTER_USER='repluser', MASTER_PASSWORD='replpass', MASTER_PORT=3306, MASTER_LOG_FILE='XXXX',
  MASTER_LOG_POS=XXXX;
  Start  slave on  3307.
  


You're done.