snmp__uptime

#!/usr/bin/perl -w

=head1 NAME

snmp__uptime - Munin plugin to retrieve uptime information from a SNMP
device.

=head1 APPLICABLE SYSTEMS

Uptime should be supported by all SNMP devices that support SNMPv2 and
up (If I have understood the MIBs rightly :-)

=head1 CONFIGURATION

As a rule SNMP plugins need site specific configuration.  The default
configuration (shown here) will only work on insecure sites/devices.

   [snmp_*]
        env.version 2
        env.community public

In general SNMP is not very secure at all unless you use SNMP version
3 which supports authentication and privacy (encryption).  But in any
case the community string for your devices should not be "public".

Please see 'perldoc Munin::Plugin::SNMP' for further configuration
information.

=head1 INTERPRETATION

The plugin reports how long the device has been up.  This is not the
same as uptime in percent as used in SLAs.

Actually, this isn't entirely true.  It reports the uptime of the
SNMP agent.  For "embedded" devices such as switches or printers, this
will be the same as uptime, but this may not always be the case for
servers.  (For instance, it would be less if an administrator had manually
restarted the SNMP daemon/service.)

The day and week graphs for uptime are not very interesting - the
year, and perhaps the month graphs are more interesting.  The year
graphs average number will show your devices average uptime the last
year (actually 400 days).

=head1 MIB INFORMATION

This plugin requires support for the DISMAN-EVENT-MIB authored by the
IETF Distributed Management Working Group.  It reports the
contents of the sysUpTimeInstance OID.

=head1 MAGIC MARKERS

  #%# family=snmpauto
  #%# capabilities=snmpconf

=head1 BUGS

None known.

=head1 AUTHOR

  Copyright (C) 2008-2009 Nicolai Langfeldt
  Copyright (C) 2006 Andreas Schuldei
  Copyright (C) Sébastien Barbereau

=head1 LICENSE

GPLv2 or (at your option) any later version.

=cut

use strict;
use Munin::Plugin::SNMP;

if (defined $ARGV[0] and $ARGV[0] eq "snmpconf") {
        print "require 1.3.6.1.2.1.1.3.0 [0-9]\n"; # Number
        exit 0;
}

if (defined $ARGV[0] and $ARGV[0] eq "config") {
    my ($host) = Munin::Plugin::SNMP->config_session();
        print "host_name $host\n" unless $host eq 'localhost';
        print "graph_title Uptime
graph_args --base 1000 -l 0
graph_vlabel uptime in days
graph_category system
graph_info This graph shows the number of days that the the host is up and running so far.
uptime.label uptime
uptime.info The system uptime itself in days.
uptime.draw AREA
";
        exit 0;
}

my $session = Munin::Plugin::SNMP->session(-translate =>
                                           [ -timeticks => 0x0 ]);

my $uptime = $session->get_single (".1.3.6.1.2.1.1.3.0") || 'U';

print "Retrieved uptime is '$uptime'\n" if $Munin::Plugin::SNMP::DEBUG;

if ($uptime ne 'U') {
    $uptime /= 8640000;
}

print "uptime.value ", $uptime, "\n";