{"id":935,"date":"2010-12-02T18:34:12","date_gmt":"2010-12-02T18:34:12","guid":{"rendered":"https:\/\/supportex.net\/?p=935"},"modified":"2019-05-11T05:41:22","modified_gmt":"2019-05-11T03:41:22","slug":"snmp-extend-feature-nagios","status":"publish","type":"post","link":"https:\/\/supportex.net\/blog\/2010\/12\/snmp-extend-feature-nagios\/","title":{"rendered":"Using SNMP extend feature in Nagios"},"content":{"rendered":"

In Supportex<\/a> we monitor a lot of web services and devices. One of the most convenient ways to monitor various parameters is SNMP extend<\/strong> feature.<\/p>\n

Let’s consider how it works. Assume you already have SNMP daemon installed.<\/p>\n

    \n
  1. \n
      \n
    1. Firstly you need to add configuration line in you SNMP daemon config and restart daemon:<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n

      extend raid-md0 \/usr\/local\/bin\/check_md_raid.pl<\/p><\/blockquote>\n

      To use Nagios with extend<\/strong> feature you can use Michal Ludvig’s plugin, which could be found on his page<\/a>.<\/p>\n

        \n
      1. \n
          \n
        1. Next you need to create Nagios command:
          \ncheck_snmp_extend:USER1$\/check_snmp_extend_em.pl -H $HOSTADDRESS$ -c $ARG1$<\/code><\/li>\n
        2. And finally create Nagios service:<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n
          define service {\nuse check_snmp_extend_service\nservice_description RAID md0 \tstatus\ncheck_command \tcheck_snmp_extend!raid-md0\nhost_name server41\ncontact_groups \tSupportex\n}<\/pre>\n
          To meet our requirements we wrote our own script for Nagios with pure Perl, so it doesn’t fork external command \u00a0snmpget<\/strong> now and should work faster. Besides it could be used with \u00a0embedded Nagios Perl<\/a>.
          \nTo use it you should install Net::SNMP library for Perl. So use<\/p>\n
          [root@playground ~]#yum install perl-Net-SNMP<\/code><\/p>\n
          for Centos or Fedora and<\/p>\n
          [root@playground ~]#aptitude install libsnmp-perl<\/code><\/p>\n
          for Ubuntu or Debian.<\/p>\n
          Download<\/a> script for getting SNMP extend output.<\/p>\n
          Here it is:<\/p>\n
          #!\/usr\/bin\/perl\n# nagios: +epn\n#\n# Pure Perl script for getting SNMP extend output.\n# Alex Tykhonov, Supportex.net, 2010.\n# http:\/\/supportex.net\/\n# mail:\nuse POSIX;\nuse strict;\nuse Getopt::Long;\nuse lib &amp;amp;quot;\/usr\/lib64\/nagios\/plugins&amp;amp;quot; ;\nuse utils qw(%ERRORS &amp;amp;amp;print_revision &amp;amp;amp;support &amp;amp;amp;usage );\nuse Net::SNMP v5.1.0 qw(snmp_type_ntop DEBUG_ALL);\nsub print_usage {print '';};\n\n# SNMP stuff:\nmy $USER = &amp;amp;quot;yoursnmpuser&amp;amp;quot;;\nmy $PASS = &amp;amp;quot;strongspassword&amp;amp;quot;;\nmy $AUTHPROT = &amp;amp;quot;yourAuthProt&amp;amp;quot;;\nmy $PRIVPROT = &amp;amp;quot;yourProvProt&amp;amp;quot;;\n\n# Host related\nmy $host_address;\nmy $snmp_port;\nmy $command;\n\nGetOptions(&amp;amp;quot;port=s&amp;amp;quot;, $snmp_port, &amp;amp;quot;c=s&amp;amp;quot;, $command, &amp;amp;quot;H=s&amp;amp;quot;, $host_address);\nunless ( defined($host_address) &amp;amp;amp;&amp;amp;amp; defined($command) )\n{\nprint_usage();\n}\n\nif ( !defined($snmp_port) ) {$snmp_port = &amp;amp;quot;161&amp;amp;quot;; }\n\n$ENV{'PATH'}='';\n$ENV{'BASH_ENV'}='';\n$ENV{'ENV'}='';\n\nmy ($s, $error) = Net::SNMP-&amp;amp;gt;session(\n-hostname =&amp;amp;gt; $host_address,\n-version =&amp;amp;gt; &amp;amp;quot;3&amp;amp;quot;,\n-username =&amp;amp;gt; $USER,\n-authprotocol =&amp;amp;gt; $AUTHPROT,\n-authpassword =&amp;amp;gt; $PASS,\n-privpassword =&amp;amp;gt; $PASS,\n-privprotocol =&amp;amp;gt; $PRIVPROT,\n-port =&amp;amp;gt; $snmp_port );\nif (!defined($s)) {\nprintf(&amp;amp;quot;ERROR: %s.n&amp;amp;quot;, $error);\nexit 1;\n}\n\nmy $oid = &amp;amp;quot;.1.3.6.1.4.1.8072.1.3.2.3.1.2.&amp;amp;quot;;\n$oid = $oid . length($command);\n\nmy @array = split(\/\/, $command);\nmy $item;\nmy $ret = 3;\nforeach $item (@array) { $oid = $oid . &amp;amp;quot;.&amp;amp;quot; . ord($item); }\n\nmy $response = $s-&amp;amp;gt;get_request(\n-varbindlist =&amp;amp;gt; [$oid]\n);\n$s-&amp;amp;gt;close;\n\nmy $output = $response-&amp;amp;gt;{$oid};\nif ( $output =~ \/OK\/ ) { $ret = 0; }\nif ( $output =~ \/WARNING\/ ) { $ret = 1; }\nif ( $output =~ \/CRITICAL\/ ) { $ret = 2; }\n\nprint $output, &amp;amp;quot;n&amp;amp;quot;;\n\nexit($ret);\n<\/pre>\n
          Didn’t find the answer to your question? Ask it<\/a> our administrators to reply we will publish on website.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"
          In Supportex we monitor a lot of web services and devices. One of the most convenient ways to monitor various parameters is SNMP extend feature. Let’s consider how it works. Assume you already have SNMP daemon installed. Firstly you need to add configuration line in you SNMP daemon config and restart daemon: extend raid-md0 \/usr\/local\/bin\/check_md_raid.pl… <\/p>\n
          Read <\/a><\/div>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[152],"tags":[275,161,201,202],"class_list":["post-935","post","type-post","status-publish","format-standard","hentry","category-linux","tag-linux","tag-monitoring","tag-nagios-en","tag-snmp-en"],"yoast_head":"\nUsing SNMP extend feature in Nagios – Supportex.NET blog<\/title>\n<meta name=\"description\" content=\"How to use SNMP extend feature in Nagios\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/supportex.net\/blog\/2010\/12\/snmp-extend-feature-nagios\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Using SNMP extend feature in Nagios – Supportex.NET blog\" 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