snmpd.conf

exec .1.3.6.1.4.1.2021.555.1 cat /bin/cat /backup/export_full/export_full.exit_status
exec .1.3.6.1.4.1.2021.555.2 cat /bin/cat /backup/export_dos/export_dos.exit_status
exec .1.3.6.1.4.1.2021.555.3 cat /bin/cat /backup/export_full_DB/export_full_DB.exit_status
exec .1.3.6.1.4.1.2021.555.4 cat /bin/cat /backup/export_tres/exportTRES.exit_status

check_snmp_exit_status.pl

#!/usr/bin/perl
use Net::SNMP;
$oid = $ARGV[1];
 
$snmpv3_username = "nagios";    # SNMPv3 username
$snmpv3_password = "ClaV3RfsTtD2"; # SNMPv3 password
$snmpv3_authprotocol = "md5";          # SNMPv3 hash algorithm (md5 / sha)
$snmpv3_privpassword = "";             # SNMPv3 hash algorithm (md5 / sha)
$snmpv3_privprotocol = "des";          # SNMPv3 encryption protocol (des / aes / aes128)
$version = "3";
$timeout = "2";
$hostname = $ARGV[0];
# Crear la sesion SNMP
        ($s, $e) = Net::SNMP->session(
                -username       =>  $snmpv3_username,
                -authpassword   =>  $snmpv3_password,
                -authprotocol   =>  $snmpv3_authprotocol,
                -hostname       =>  $hostname,
                -version        =>  $version,
                -timeout        =>  $timeout,
        );
        if ($s){
        } else {
            print "CRITICAL - El agente no responde, SNMP v3 ($e)\n";
            exit(2);
        }
    $s->get_request($oid);
        foreach ($s->var_bind_names()) {
            $oid_consulta   = $s->var_bind_list()->{$_};
        }
$s->close();
 
if($oid_consulta == 0) {
    print "OK - El exit status es ".$oid_consulta."\n";
    exit 0;
} else {
    print "CRITICAL - El exit status es ".$oid_consulta."\n";
    exit 2;
}

Configuración de comando en Nagios

define service {
	host_name                      	srvblabla
	service_description            	Control de exit status de backup
	use                            	linux-service
	check_command                  	check_snmp_cat_file_exit_status!.1.3.6.1.4.1.2021.555.1.101.1
	check_interval                 	240
	notification_interval          	300
}