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#!/usr/bin/perl -w
# This script is designed to check a backup directory populated with
# subdirectories named after hosts, within which there are backups of various
# types.
#
# Example:
# /home/backup:
# foo.example.com
#
# foo.example.com:
# rdiff-backup .ssh
#
# rdiff-backup:
# root home rdiff-backup-data usr var
#
# There are heuristics to determine the backup type. Currently, the following
# types are supported:
#
# rdiff-backup: assumes there is a rdiff-backup/rdiff-backup-data/backup.log file
# duplicity: assumes there is a dup subdirectory, checks the latest file
# dump files: assumes there is a dump subdirectory, checks the latest file
#
# This script returns output suitable for send_nsca to send the results to
# nagios and should therefore be used like this:
#
# checkbackups.sh | send_nsca -H nagios.example.com
use Getopt::Std;
# XXX: taken from utils.sh from nagios-plugins-basic
my $STATE_OK=0;
my $STATE_WARNING=1;
my $STATE_CRITICAL=2;
my $STATE_UNKNOWN=3;
my $STATE_DEPENDENT=4;
# gross hack: we look into subdirs to find vservers
my @vserver_dirs = qw{/var/lib/vservers /vservers};
our $opt_d = "/backup";
our $opt_c = 48 * 60 * 60;
our $opt_w = 24 * 60 * 60;
our $opt_v = 0;
our $opt_o;
if (!getopts('d:c:w:vo')) {
print <<EOF
Usage: $0 [ -d <backupdir> ] [ -c <threshold> ] [ -w <threshold> ] [ -o ] [ -v ]
EOF
;
exit();
}
sub CheckRdiffBackups {
my ($dir, $subdir, $optv) = @_;
$flag="$dir/$subdir/rdiff-backup-data/backup.log";
$type="rdiff";
if (open(FLAG, $flag)) {
while (<FLAG>) {
if (/StartTime ([0-9]*).[0-9]* \((.*)\)/) {
$last_bak = $1;
$extra_msg = ' [backup.log]';
$opt_v && print STDERR "found timestamp $1 ($2) in backup.log\n";
}
}
if (!$last_bak) {
$message = "cannot parse backup.log for a valid timestamp";
next;
}
} else {
$opt_v && print STDERR "cannot open backup.log\n";
}
close(FLAG);
foreach my $vserver_dir (@vserver_dirs) {
$vsdir = "$dir/${subdir}$vserver_dir";
if (opendir(DIR, $vsdir)) {
@vservers = grep { /^[^\.]/ && -d "$vsdir/$_" } readdir(DIR);
$opt_v && print STDERR "found vservers $vsdir: @vservers\n";
closedir DIR;
} else {
$opt_v && print STDERR "no vserver in $vsdir\n";
}
}
return ($message, $extra_msg, $last_bak);
}
my $backupdir= $opt_d;
my $crit = $opt_c;
my $warn = $opt_w;
my @hosts;
if (defined($opt_o)) {
@hosts=qx{hostname -f};
} else {
# XXX: this should be a complete backup registry instead
@hosts=qx{ls $backupdir | grep -v lost+found};
}
chdir($backupdir);
my ($state, $message, @vservers, $host);
foreach $host (@hosts) {
chomp($host);
if ($opt_o) {
$dir = $backupdir;
} else {
$dir = $host;
}
my $flag="";
my $type="unknown";
my $extra_msg="";
@vservers = ();
$state = $STATE_UNKNOWN;
$message = "???";
if (-d $dir) {
# guess the backup type and find a proper stamp file to compare
# XXX: the backup type should be part of the machine registry
my $last_bak;
if (-d "$dir/rdiff-backup") {
my ($message, $extra_msg, $last_bak) = CheckRdiffBackups($dir, 'rdiff-backup', $opt_v);
} elsif (-d "$dir/dump") {
# XXX: this doesn't check backup consistency
$flag="$dir/dump/" . `ls -tr $dir/dump | tail -1`;
chomp($flag);
$type="dump";
} elsif (-d "$dir/dup") {
# XXX: this doesn't check backup consistency
$flag="$dir/dup/" . `ls -tr $dir/dup | tail -1`;
chomp($flag);
$type="dup";
} elsif (-r "$dir/rsync.log") {
# XXX: this doesn't check backup consistency
$flag="$dir/rsync.log";
$type="rsync";
} else {
$message = "unknown system";
next;
}
if (!defined($last_bak)) {
my @stats = stat($flag);
if (not @stats) {
$message = "cannot stat flag $flag";
next;
}
$last_bak = $stats[9];
}
my $t = time();
my $delta = $t - $last_bak;
if ($delta > $crit) {
$state = $STATE_CRITICAL;
} elsif ($delta > $warn) {
$state = $STATE_WARNING;
} elsif ($delta >= 0) {
$state = $STATE_OK;
}
$message = "$delta seconds old$extra_msg";
} else {
$message = "no directory";
}
} continue {
printf "$host\tbackups\t$state\t$message\n";
my @dom_sufx = split(/\./, $host);
my $dom_sufx = join('.', @dom_sufx[1,-1]);
foreach my $vserver (@vservers) {
printf "$vserver.$dom_sufx\tbackups\t$state\t$message, same as parent: $host\n";
}
}
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