How to create replication between two MySQL instances

It is important create a mysql user into each instance that it could exec only replication actions, in mysql shell:

create user replica@localhost;
grant replication slave on *.* to replica@localhost identified by 'replicapassword';

Minimal configuration file (/etc/my.cnf) of each mysql instance is:
master

[mysqld]
server-id=1
log-bin=/var/log/mysql/binlog.log
expire_logs_days=10
max_binlog_size=100M
datadir=/var/lib/mysql/data
socket=/var/lib/mysql/mysql.sock
innodb_flush_log_at_trx_commit=1
sync_binlog=1

slave

[mysqld]
server-id=2
master-host=ip.server.master
master-port=3306
master-user=replica
master-password=replicapassword
log-bin=/var/log/mysql/binlog.log
expire_logs_days=10
max_binlog_size=100M
datadir=/var/lib/mysql/data
socket=/var/lib/mysql/mysql.sock
innodb_flush_log_at_trx_commit=1
sync_binlog=1
relay-log-index=slave-relay-bin.index
relay-log=slave-relay-bin

Last step is initializing and starting replication. In mysql shell:
master

reset master;

slave

change master to master_host='ip.server.master',
master_user='replica',
master_password='replicapassword',
master_port=3306;

If you want resetting replication:
master

reset master;

slave

stop slave;
reset slave;
start slave;

If you want show which it is binary file and position:

show master status;
show slave status;

Reference: mysql.com