scduply

h1. MySQL backup

We backing up MySQL database via shutdown/startup procedure.

Despite some disadvantages, it will be the best choice for many sites because:

* This is much faster than the dump in the backup.

* This is very much faster than the restoring from the dump.

* This allowing to not differ between MyISAM and InnoDB.

* This allowing to save traffic via duplicity's block-based incremental alogrithms (implemented via librsync).

To do the backup you have to place the following files in your mysql backup job's profile.

File "pre"

<pre>

if [ `ps ax|grep mysqld|grep -v grep|wc -l` -eq 0 ]; then

  mysql_stopped=yes

  echo "Warning: MySQL is not running."

else

  /etc/init.d/mysql stop

  sleep 5

  if [ `ps ax|grep mysqld|grep -v grep|wc -l` -gt 0 ]; then

    echo "Error: MySQL is not stopped. Skiping backup"

    exit 1

  fi

fi

</pre>

File "post"

<pre>

if [ -z "$mysql_stopped" ]; then

  /etc/init.d/mysql start

  sleep 5

  if [ `ps ax|grep mysqld|grep -v grep|wc -l` -eq 0 ]; then

    echo "Error: MySQL is not restarted properly. Take care."

    exit 1

  fi

fi

</pre>