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I tried your script "xtrabackup.sh". The backup works like expectet but I get a problem with the restore prodedure. The call

xtrabackup.sh restore 2015-06-30_09-12-47 tmp/xxx

results in the error

sh: 1: xtrabackup_51: not found

And indeed: my xtrabackup package (openSUSE) doesn't contain a program called "xtrabackup_51" anymore. In the next step I changed your script

from:

$INNOBACKUPEX_COMMAND --apply-log --ibbackup=xtrabackup_51 $DESTINATION  &>> $LOG_FILE || fail

To:

$INNOBACKUPEX_COMMAND --apply-log  $DESTINATION  &>> $LOG_FILE || fail 

After this change the restore prodedure works like expected.

The versions:

mysql --version
mysql  Ver 15.1 Distrib 10.1.5-MariaDB, for Linux (i686) using  EditLine wrapper

xtrabackup --version
xtrabackup version 2.2.11 based on MySQL server 5.6.24 Linux (i686) (revision id: )

Would it be a good idea to check the xtrabackup version inside your script and modify the restore call? Thanks in advance.

...Rolf

I suggest an additional parameter "SOCKET" for the config file (.xtrabackup.config) defaults to
/tmp/mysql.sock. The reason is the following innobackupex's error:

Failed to connect to MySQL server: Can't connect to local MySQL server 
through socket '/tmp/mysql.sock' (2).

My actual socket is /var/run/mysql/mysql.sock.

Loading configuration from /root/.duplicity.config.
Command line error: Expected 2 args, got 0
Enter 'duplicity --help' for help screen.

basically its running this:
/usr/bin/nice -n 15 /usr/bin/ionice -c2 -n7 /usr/bin/duplicity