Aug 22

Use nagios to check your raid arrays

Linux, Perl, Security No Comments »

As a sysadmin, I should always search and check for errors on every machine that I manage. Unfortunately one of them has an Adaptec 5405 which I forgot to monitor using nagios and just like Murphy’s Law says – “Anything that can go wrong will go wrong” – something went wrong and I have lost information. Not a really big problem because I have backups of everything but it could have been avoided if I had monitored the status of the Adaptec just the way I do with software raid arrays (/proc/mdstat rules!).

So I developed another simple script using Perl (again :-P ) to check the status of all the available arrays.

#!/usr/bin/perl -w
use strict;
use warnings;
 
my $adaptec_tool = "/usr/src/cmdline/arcconf";
 
my $dump = `$adaptec_tool getconfig 1 ld`;
my @raids = ();
 
while ($dump =~ /Logical device name.*?:.*?([a-z0-9]+).*?raid level.*?:.*?([0-9]+).*?status of logical device.*?:.*?([a-z0-9]+)/gsi) {
        push @raids, {"name" => $1, "raidlevel" => $2, "status" => $3};
 
}
 
foreach my $raid (@raids)
{
        if ( $$raid{status} ne "Optimal" )
        {
                print "Critical: Raid not Optimal! (Array Name: $$raid{name}, Level: $$raid{raidlevel}, Status: $$raid{status})\n";
                exit(1);
        }
}
 
print "OK: All arrays in optimal shape\n";
exit (0);

You just need to download the “Adaptec Storage Manager” to connect to the RAID card and read the status. You can use this link to do it.

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Apr 15

Script básico para NAGIOS para monitorização de Portas

Linux, PHP, Snippets No Comments »

Estive com uns problemas na empresa relacionados com o sendmail.
Quando nada fazia prever, o sendmail simplesmente crasha começando a recusar activamente todos os pedidos de envio de email.

Criei um script genérico para verificar se uma determinada porta de um servidor está a responder. Basta editar o endereço, porta e opcionalmente definir um timeout máximo para o pedido.

#!/usr/bin/php -q
<?
 
/*****************************************************
 
    Check For Open Ports - David Gouveia
 
*****************************************************/
 
$address = '127.0.0.1';
$port = 25;
$timeout = 5;  //Max time to wait before give up.
 
$checkport = fsockopen($address, $port, $errnum, $errstr, $timeout);
 
if(!$checkport){
        print "CRITICAL: Host $address at port $port not responding!\n";
        fclose($checkport);
        exit(2);
}
 
print "OK: Host $address at port $port is responding!\n";
fclose($checkport);
exit(0);
 
?>

Coloquem na pasta dos plugins e não se esqueçam de dar as permissões correctas (755).
Alternativamente podem passar o valor do IP e porta como argumentos via consola.

basta trocar isto :

    $address = ’127.0.0.1′;
    $port = 25;

por isto :

    $address = $argv[1];
    $port = $argv[2]
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