Add munin2snmp, snmp agent for querying munin-node plugins over snmp
This commit is contained in:
Alex Mestiashvili
parent
c24aaaf9d0
commit
45941d87dc
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-- -*- snmpv2 -*-
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-- ----------------------------------------------------------------------
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-- MIB file for munin
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-- ----------------------------------------------------------------------
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--
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-- Currenly, only statistics are available.
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MUNIN-MIB DEFINITIONS ::= BEGIN
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IMPORTS
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OBJECT-TYPE, MODULE-IDENTITY, enterprises,
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Counter64
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FROM SNMPv2-SMI
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OBJECT-GROUP, MODULE-COMPLIANCE
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FROM SNMPv2-CONF
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TEXTUAL-CONVENTION
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FROM SNMPv2-TC;
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munin MODULE-IDENTITY
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LAST-UPDATED "201101060000Z"
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ORGANIZATION "BlackMesa"
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CONTACT-INFO "GordonFreeman@BlackMesa.mil"
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DESCRIPTION
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"This MIB module describes information gathered through MUNIN
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ioctl for each interface available on the monitored
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system. Currently, only statistics are available. Information
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may be redundant with what is available in IF-MIB, RMON-MIB,
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EtherLike-MIB and some other MIB but they are presented here
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without any abstraction."
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REVISION "201101060000Z"
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DESCRIPTION "Initial revision."
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::= { munin2snmp }
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-- We are hosted under The IMS Company OID.
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munin2snmp OBJECT IDENTIFIER ::= { enterprises 123456 }
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MuninStatString ::= TEXTUAL-CONVENTION
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DISPLAY-HINT "32a"
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STATUS current
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DESCRIPTION "Name of statistic"
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SYNTAX OCTET STRING (SIZE (1..32))
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---
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--- muninStatTable
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---
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muninStatTable OBJECT-TYPE
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SYNTAX SEQUENCE OF MuninStatEntry
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MAX-ACCESS not-accessible
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STATUS current
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DESCRIPTION
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"Statistics from munin"
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::= { munin 100 }
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muninStatEntry OBJECT-TYPE
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SYNTAX MuninStatEntry
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MAX-ACCESS not-accessible
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STATUS current
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DESCRIPTION
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"Statistic for one interface"
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INDEX { IMPLIED muninStatName }
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::= { muninStatTable 1 }
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MuninStatEntry ::= SEQUENCE {
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muninStatName MuninStatString,
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muninStat Counter64
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}
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muninStatName OBJECT-TYPE
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SYNTAX MuninStatString
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MAX-ACCESS not-accessible
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STATUS current
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DESCRIPTION
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"Name of the statistic as returned by MUNIN ioctl."
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::= { muninStatEntry 1 }
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muninStat OBJECT-TYPE
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SYNTAX Counter64
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MAX-ACCESS read-only
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STATUS current
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DESCRIPTION
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"Value of the statistic as returned by MUNIN ioctl."
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::= { muninStatEntry 2 }
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---
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--- muninConformance
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---
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muninConformance OBJECT IDENTIFIER ::= { munin 101 }
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muninCompliances MODULE-COMPLIANCE
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STATUS current
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DESCRIPTION
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"munin compliance statement"
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MODULE -- this module
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MANDATORY-GROUPS {
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muninStatGroup
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}
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::= { muninConformance 1 }
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muninStatGroup OBJECT-GROUP
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OBJECTS {
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muninStat
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}
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STATUS current
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DESCRIPTION
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"Conformance groupe for munin statistics."
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::= { muninConformance 2 }
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END
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=head1 NAME
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munin2snmp - SNMP Agent to query munin-node over snmp
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=head1 REQUIREMENTS
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Net::SNMP and IO::Socket perl modules, munin-node with some plugins
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=head2 Example configuration
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/etc/snmp/snmpd.conf
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master agentx
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agentAddress udp:127.0.0.1:161
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rocommunity public 127.0.0.1
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On a newer system it is enough to define "master" option only
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MUNIN-MIB should be installed on the client,
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it goes to /usr/local/share/snmp/mibs or /usr/share/munin/mibs
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or another place where snmpd expects to find the MIB files.
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See also http://www.net-snmp.org/wiki/index.php/FAQ:MIBs_03
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=head2 Usage
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After setting up snmpd, start the agent:
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./munin2snmp.pl
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Now one can query the agent
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snmpwalk -v 2c -mMUNIN-MIB -c public localhost .1.3.6.1.4.1.123456.100.1.1
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where "1.3.6.1.4.1.123456.100.1.1" is example OID selected as the base
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tree for the agent.
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You might need to change the host, port, oidbase and munin_plugins you want to use.
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The defaults:
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$Munin{PORT} = '4949';
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$Munin{HOST} = 'localhost'
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$oidbase = ".1.3.6.1.4.1.123456.100.1.1"
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@munin_plugins = qw ( load swap users uptime vmstat df );
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=head1 ACKNOWLEDGEMENTS
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Heavily inspired by
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Vincent Bernat: https://github.com/vincentbernat/extend-netsnmp
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and Masahito Zembutsu: https://github.com/zembutsu/muninwalk
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=head1 LICENSE
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GPLv2
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@ -0,0 +1,201 @@
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#!/usr/bin/perl
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use strict;
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use NetSNMP::OID;
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use NetSNMP::ASN (':all');
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use NetSNMP::agent (':all');
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use IO::Socket;
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my %cache = (); # Cache
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my @cache_oids = (); # Keys, sorted
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my $cache_updated = 0;
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my $oidbase = ".1.3.6.1.4.1.123456.100.1.1";
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my $delimiter = ' = ';
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# initialize
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my %Munin;
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$Munin{PORT} = '4949';
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$Munin{HOST} = 'localhost';
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# See munin plugins dir for more plugins
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our @munin_plugins= qw ( load swap users uptime vmstat df );
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# Update cache
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sub update_stats {
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return if time() - $cache_updated < 30;
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%cache = ();
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foreach my $plugin (@munin_plugins) {
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$plugin =~ s/^.*\///;
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my $DATA = munin_fetch($plugin);
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foreach my $line (@$DATA) {
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# Extract name and value
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next if $line !~ m/^(.*)\s=\s(.*)$/xms;
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my ($name,$value) = ($1,$2);
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# Compute OID
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my $oid = "$oidbase";
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foreach my $char (split //, $name) {
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$oid .= ".";
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$oid .= ord($char);
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}
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# Put in the cache
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$cache{$oid} = $value;
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}
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}
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@cache_oids = sort { new NetSNMP::OID($a) <=> new NetSNMP::OID($b) } (keys %cache);
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$cache_updated = time();
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}
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# Handle request
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sub handle_stats {
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my ($handler, $registration_info, $request_info, $requests) = @_;
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update_stats; # Maybe we should do this in a thread...
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for (my $request = $requests; $request; $request = $request->next()) {
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$SNMP::use_numeric = 1;
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my $oid = $request->getOID();
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my $noid=SNMP::translateObj($oid);
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if ($request_info->getMode() == MODE_GET) {
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# For a GET request, we just check the cache
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if (exists $cache{$noid}) {
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$request->setValue(ASN_OCTET_STR, "$cache{$noid}");
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}
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}
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elsif ($request_info->getMode() == MODE_GETNEXT) {
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# For a GETNEXT, we need to find a best match. This is the
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# first match strictly superior to the requested OID.
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my $bestoid = undef;
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foreach my $currentoid (@cache_oids) {
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$currentoid = new NetSNMP::OID($currentoid);
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next if $currentoid <= $oid;
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$bestoid = $currentoid;
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last;
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}
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if (defined $bestoid) {
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$SNMP::use_numeric = 1;
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my $noid=SNMP::translateObj($bestoid);
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$request->setOID($bestoid);
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$request->setValue(ASN_OCTET_STR, "$cache{$noid}");
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}
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}
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}
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}
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my $agent = new NetSNMP::agent(
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'Name' => "munin",
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'AgentX' => 1);
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# Register MIB
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$agent->register("munin-stats", $oidbase,
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\&handle_stats) or die "registration of handler failed!\n";
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# Main loop
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$SIG{'INT'} = \&shutdown;
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$SIG{'QUIT'} = \&shutdown;
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my $running = 1;
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while ($running) {
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$agent->agent_check_and_process(1);
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}
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$agent->shutdown();
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sub shutdown {
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# Shutdown requested
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$running = 0;
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}
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#muninwalk
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my @collect;
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sub munin_fetch {
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my $SOCKET = IO::Socket::INET -> new ( PeerAddr => $Munin{HOST},
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PeerPort => $Munin{PORT},
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Proto => 'tcp',
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Timeout => '10',
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Type => SOCK_STREAM,
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) or die "Cannot create socket - $@\n";
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my $tmp = <$SOCKET>;
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while (my $fetch = shift(@_)) {
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my $obj = '';
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if ($fetch =~ /^(\w+)(\.)(\w+)$/ ) {
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($fetch,$obj) = ($1,$3);
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}
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$SOCKET->print("fetch $fetch\n");
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select($SOCKET);
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select(STDOUT);
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while (<$SOCKET> ) {
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chomp;
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$_ =~ s/(.value)//;
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if ($_ =~ /^(.*)(\s)(.+)$/) {
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if (($1 eq '# Unknown') or ($1 eq '# Bad')) {
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push (@collect,$fetch.$delimiter.'NULL');
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} else {
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if (!$obj or ($1 eq $obj)) {
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push (@collect,$fetch.".".$1.$delimiter.$3);
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}
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}
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} else {
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last;
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}
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}
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}
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$SOCKET->print("quit\n");
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$SOCKET->close();
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return \@collect if @collect;
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}
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=head1 NAME
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munin2snmp - SNMP Agent to query munin-node over snmp
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=head1 REQUIREMENTS
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Net::SNMP and IO::Socket perl modules, munin-node with some plugins
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=head2 Example configuration
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/etc/snmp/snmpd.conf
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master agentx
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agentAddress udp:127.0.0.1:161
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rocommunity public 127.0.0.1
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On a newer system it is enough to define "master" option only
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MUNIN-MIB should be installed on the client,
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it goes to /usr/local/share/snmp/mibs or /usr/share/munin/mibs
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or another place where snmpd expects to find the MIB files.
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See also http://www.net-snmp.org/wiki/index.php/FAQ:MIBs_03
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=head2 Usage
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After setting up snmpd, start the agent:
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./munin2snmp.pl
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Now one can query the agent
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snmpwalk -v 2c -mMUNIN-MIB -c public localhost .1.3.6.1.4.1.123456.100.1.1
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where "1.3.6.1.4.1.123456.100.1.1" is example OID selected as the base
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tree for the agent.
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You might need to change the host, port, oidbase and munin_plugins you want to use.
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The defaults:
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$Munin{PORT} = '4949';
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$Munin{HOST} = 'localhost'
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$oidbase = ".1.3.6.1.4.1.123456.100.1.1"
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@munin_plugins = qw ( load swap users uptime vmstat df );
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=head1 ACKNOWLEDGEMENTS
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Heavily inspired by
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Vincent Bernat: https://github.com/vincentbernat/extend-netsnmp
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and Masahito Zembutsu: https://github.com/zembutsu/muninwalk
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=head1 LICENSE
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GPLv2
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