Nagios SNMP Plugins
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glensc/nagios-snmp-plugins
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Nagios SNMP Plugins =================== What is it? ----------- These are two plugins to be used with Nagios. They should still work with NetSaint, but as this is now really ancient, I don't support Netsaint any longer. You also need the Net SNMP Daemon in a reasonable new version. Nagios: http://www.nagios.org/ Net-SNMPD: http://www.net-snmp.org/ Travis-CI Build Status: https://travis-ci.org/glensc/nagios-snmp-plugins Who wrote it? ------------- These programs are (C) 2002-2008 by Henning P. Schmiedehausen (C) 2010-2013 Elan Ruusamäe <glen@delfi.ee> Distributed under GNU GENERAL PUBLIC LICENSE v2 (See file COPYING in the distribution). Where to get it? ---------------- Homepage: https://github.com/glensc/nagios-snmp-plugins Release downloads: https://github.com/glensc/nagios-snmp-plugins/releases Acknowlegdements & Thanks ------------------------- Elan Ruusamäe <glen at pld-linux.org> - enhanced reporting for the check_snmp_proc plugin. Also the only patch I ever got from a distribution vendor. :-) Jose Pedro Oliveira <jpo at di.uminho.pt> - for maintaining the Fedora Extras RPM; I rolled a number of things from that spec file back into the "official" one. Oliver Faenger <oliver.faenger at cityweb.de> - representing many many people who reported and sent me patches for the gcc4 compilation issue. Mark Janssen <maniac at maniac.nl> - patch that displays the checked devices and processes Henning P. Schmiedehausen - original code author All the Linux distributions who included that little hack into their package lists. BTW: I'd appreciate if you drop me a quick line when you include nagios-snmp-plugins into a distribution. So far I know of: - Fedora 7 - Fedora Extras - PLD Linux What can these plugins do? -------------------------- NET-SNMP gives you an unique feature: It makes checks for running processes and/or disk size configurable in the SNMP daemon and queryable via SNMP. So you can do proc syslogd proc klogd disk / 5% disk /usr 10% in your snmpd.local.conf and have the snmp daemon check that you always have free space on your root and usr file system and that you have syslogd and klogd processes running. Querying this from a monitoring tool however, is very cumbersome. You need to check what disks are there, then query error status. These two plugins does all the work for you. Where do the plugins run? ------------------------- Well, on Linux. :-) That's where I wrote them. They should compile on any other *x like Operating system, too. If you get them to compile, please let me know. I compiled and tested these plugins on RedHat Linux 9 Fedora Core 1 Fedora Core 3 Fedora Core 4 Fedora Core 5 Fedora Core 6 RedHat Enterprise Linux 3 RedHat Enterprise Linux 4 RedHat Enterprise Linux 5 CentOS 5 using various nagios versions between 1.2 and 2.9. Users reported success on various SuSE Linux and SLES versions. Compilation on *BSD seems to be possible if you have a GNU getline library. How do I build and install? --------------------------- - Unpack the distribution. - Run aclocal autoheader automake --add-missing autoconf ./configure make or simply ./build.sh - you should now have two binaries: check_snmp_disk and check_snmp_proc - copy them into your Nagios plugins directory. How do I configure the plugins? ------------------------------- Using Nagios there are two ways to configure the plugins: The old way: - add the following two lines to your /etc/nagios/command.cfg: command[check_snmp_disk]=/usr/lib/nagios/plugins/check_snmp_disk -H $HOSTADDRESS$ -C $ARG1$ command[check_snmp_proc]=/usr/lib/nagios/plugins/check_snmp_proc -H $HOSTADDRESS$ -C $ARG1$ Replace /usr/lib/nagios/plugins/ with the directory where you copied the binaries! The new way: - add the following lines to your /etc/nagios/checkcommands.cfg # 'check_snmp_disk' command definition define command { command_name check_snmp_disk command_line $USER1$/check_snmp_disk -H $ARG1$ -C $USER3$ } # 'check_snmp_proc' command definition define command { command_name check_snmp_proc command_line $USER1$/check_snmp_proc -H $ARG1$ -C $USER3$ } - The Community password should be defined in your resources.cfg If you don't use $USER3$, adjust the definition above. How do I use the plugins? ------------------------- First, select something to check. You find a detailed description in man snmpd.conf(5). I, e.g. use (in /etc/snmpd/snmpd.local.conf under RedHat/Fedora): # # SNMP checked disks # disk / 5% disk /usr 5% disk /var 10% disk /boot 1% disk /mnt/disk0 10% # # SNMP checked Processes # proc crond proc ntpd proc sshd proc syslogd proc klogd Which assures that all my disks do not fill up and that I have the most important processes running on my boxes. You need a configured snmpd with at least a read community configured. Now try your configuration: Run the disk plugin manually: check_snmp_disk -H <host to check> -C <community> It should report either "Checked <xxx> disks." and a return code of 0 if everything is fine (<xxx> should be the number of disks configured in the snmp.local.conf file), or "<diskname>: less than <xxx>% free (= <yyy>%) (<devicename>)" and a return code of 2 if there is a problem (diskname and devicename depend on the disk, <xxx> is the threshold configured and <yyy> is the actual free space). The same testing can be done with the check_snmp_proc plugin. Now configure your monitor program to monitor a host (in hosts.cfg): The old way: service[myhost]=DISK;0;24x7;3;5;1;admins;120;24x7;1;1;0;;check_snmp_disk!<community> service[myhost]=PROC;0;24x7;3;5;1;admins;120;24x7;1;1;0;;check_snmp_proc!<community> where <community is your read-community from above) and you're set. The ";0;24x7;3;5;1;admins;120;24x7;1;1;0;;" parameters should be of course your very own configuration. :-) The new way: # Service definition define service { use generic-service host_name myhost service_description Disk Space check_command check_snmp_disk!myhost } # Service definition define service { use generic-service host_name myhost service_description Running processes check_command check_snmp_proc!myhost } Of course you should replace "myhost" with your host. What is left to do? ------------------- - Hard/Soft Thresholds - If multiple failures occur, only the first is reported (Nagios restriction) and every further error only when the first is fixed. Release History --------------- see NEWS FILE