So first you might just save yourself some time and read the Percona example for this:
But just in case here is an example based on a real situation.
# innobackupex /tmp/ <---- this is whatever directory you want to store the backup in. This is a very basic no fluff hot backup.
InnoDB Backup Utility v1.5.1-xtrabackup; Copyright 2003, 2009 Innobase Oy
130809 14:40:11 innobackupex: Connection to database server closed
130809 14:40:11 innobackupex: completed OK!
Make sure you see the xtrabackup_binlog_info file. If you do not you will not easily have the position and log information. You will have to dig into the binlogs based on time and etc. Which is more work than needed.
innobackupex --apply-log /tmp/<Timestamp Directory Here>
Now up to you. You can rsync the directory to the slave or tar[gzip] then scp to the slave. Regardless of method to move to slave, you have a hotbackup created and ready to go.
# /etc/init.d/mysql stop
mv /var/lib/mysql /var/lib/mysql_ORIG
However you moved the file from the master to the slave, put the contents into the datadir folder, assumed for example: /var/lib/mysql .
# chown -R mysql:mysql mysql
Starting MySQL... [ OK ]
Now in your slave MySQL server, you can set the replication user information easily.
CHANGE MASTER TO
MASTER_CONNECT_RETRY = 10 ;
Get the log and position from the xtrabackup file.
# more xtrabackup_binlog_info
<BinLog info> <POSITION INFO>
CHANGE MASTER TO MASTER_LOG_FILE='<BinLog info>', MASTER_LOG_POS=<POSITION INFO>;
That is it in a nutshell. For more information review the Percona url given at the start.