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#105050 11/15/2005 1:53 PM
Joined: Jun 2001
Posts: 729
Joined: Jun 2001
Posts: 729
I run a small Perl script to back up my UBB directory and MySQL database. I would like to make an addition that would chack for space so that if X amount of space is not free the back up would abort then send me an email.

Here is what I have so far... Can someone give me a hand or point me in the right direction? Still very poor in writting code frown


# System backup

#------ Variables ------
$backupdir = "/usr/local/pwrhouse"; # "." for current
$other_dirs = "/usr/local/hostboard/mainboard/cgi-bin /usr/local/hostboard/mainboard/htdocs";
print "Backup Initiated...n";
@timenow = localtime(time);

$newfilename = sprintf("%02d",$timenow[4]+1) .
sprintf("%02d",$timenow[3]) . ($timenow[5] + 1900);
print "Using Filename: $newfilename.sql n";
print "Starting database backup... n";
system "mysqldump -qce -r $newfilename.sql -u root ubb";
print "Starting Compression... n";
system "tar czf $backupdir/$newfilename.tar.gz $other_dirs $newfilename.sql";
unlink "$newfilename.sql" || print "Error: Cannot delete file specified: $newfilename - $_ n";
print "Done. n"

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#105051 11/21/2005 12:07 PM
Joined: May 2000
Posts: 1,356
Joined: May 2000
Posts: 1,356
you need to know the disk quota for that operation. Currently I don't have access to a linux system and I don't remember the exact command, but there may be some Quota modules on CPAN. And to calculate the approximate dump size, you have to calculate row lengths. I don't know how to get that value from command line, but this query will return the data:

this'll return a list with a lot of keys. "Data_length" is the one you are looking for. Here is a perl/DBI example:

use DBI;
my $dbname = "your_db_name";
my $dbh = DBI->connect('DBI:mysql:'.$dbname, 'root', '',{RaiseError => 1});
my $sth = $dbh->prepare("SHOW TABLE STATUS FROM $dbname");
my $size = 0;
while (my $stat = $sth->fetchrow_hashref) {
$size += $stat->{Data_length};
printf "Total data size: %.2f KB", $size / 1024;
here $size gives you an approximate value, because a db dump will include more information than data and a lot of insert() etc statements... But it'll give you a value to compare:

$space = $quota - $disk_space_I_currently_use;
# $xtra can be a constant value for insert() statements
if ($space > $size+$xtra) {
# do backup
} else {
# don't

#105052 11/21/2005 10:36 PM
Joined: Jan 2000
Posts: 5,833
Likes: 20
UBBDev / UBBWiki Owner
Time Lord
UBBDev / UBBWiki Owner
Time Lord
Joined: Jan 2000
Posts: 5,833
Likes: 20
[root@server ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/hdv1 10G 4.4G 5.7G 44% /

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