just install check_drbd (http://www.monitoringexchange.org/p_w_upload/download/Check-Plugins/Operating-Systems/Linux/check_drbd/check_drbd) somewhere in the path.
By default, this script will return CRITICAL if a device is unconfigured, and UNKNOWN if a device does not exists. These situations can happen with ganeti when :
- a vm is down
- a vm is down and a node has been rebooted (then the drbd device disappears).
You may want to patch check_drbd like this to avoid "false" alerts :
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--- check_drbd 2010-01-2609:10:16.000000000+0100+++/usr/local/bin/check_drbd 2010-01-2609:06:23.000000000+0100@@-38,7+38,7@@'WFConnection'=>{'value'=>'CRITICAL','type'=>'cs'},'WFReportParams'=>{'value'=>'CRITICAL','type'=>'cs'},'Connected'=>{'value'=>'OK','type'=>'cs'},-'Unconfigured'=>{'value'=>'CRITICAL','type'=>'cs'},+'Unconfigured'=>{'value'=>'OK','type'=>'cs'},# DRBD 0.6'SyncingAll'=>{'value'=>'WARNING','type'=>'cs'},'SyncingQuick'=>{'value'=>'WARNING','type'=>'cs'},@@-261,7+261,7@@}foreachmy $device (@devices){if(!(defined($cs{$device}))){-&myexit('UNKNOWN',"Could not find device $device");+&myexit('OK',"Could not find device $device");} $check{$device}=1;}put this script somewhere in the path (/usr/local/bin/drbd_gen_nagios.sh for ex):
#!/bin/bash # # Copyright (C) 2009 Maxence Dunnewind <maxence@dunnewind.net> # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. gnt-instance list --no-header --separator=:-o name|while read vm;do TMP_FILE=$(mktemp) gnt-instance info -s $vm > $TMP_FILE NODE_A=$(grep "nodeA" $TMP_FILE|grep -o "[^ ]\+,"|head -1|sed 's/,//') NODE_B=$(grep "nodeB" $TMP_FILE|grep -o "[^ ]\+,"|head -1|sed 's/,//') DEV_A=$(grep "nodeA" $TMP_FILE|cut -d "="-f 2) DEV_B=$(grep "nodeB" $TMP_FILE|cut -d "="-f 2) rm -rf $TMP_FILE for disk in $DEV_A;do echo "define service {" echo " host_name $NODE_A" echo " service_description DRBD instance $vm / device n° $disk" echo " check_command check_drbd!$disk" echo " use generic-service" echo "}" echo ""donefor disk in $DEV_B;do echo "define service {" echo " host_name $NODE_B" echo " service_description DRBD instance $vm / device n° $disk" echo " check_command check_drbd!$disk" echo " use generic-service" echo "}" echo ""donedoneImportant : This script only define drbd checks, so you already need to have the hosts configured in your nagios.
Define check_drbd, which will use check_by_ssh to call check_drbd script on the nodes.
define command{ command_name check_drbd command_line /usr/lib/nagios/plugins/check_by_ssh -H $HOSTADDRESS$ -l root -C "/usr/local/bin/check_drbd -d $ARG1$"}for example in /etc/nagiosX/conf.d/command.cfg .
Also, be sure nagios user can connect using ssh without password. If you don't have defined that, you need to :
# su - nagios# ssh-keygenGeneratingpublic/private rsa key pair.Enter file in which to save the key (/var/run/nagios3/.ssh/id_rsa):/etc/nagios3/id_rsaEnter passphrase (empty forno passphrase):Enter same passphrase again:Don't forget to replace the file. If you keep /var/run, your key will be deleted after next reboot :) Also, keep the passphrase empty. Then, copy the id_rsa.pub under /root/.ssh/authorized_keys on all your hosts. You can also add a "from" field and a "command" one to limit access :
from="1.1.1.1",command="/usr/local/bin/check_drbd" ssh-rsa AAAAB3NzaC1yc2EAAAABIwA...To generate the config, after a new instance has been added / removed, or after a replace-disks, run :
drbd_gen_nagios.sh > drbd.cfg
on ganeti master, then just copy the generated file into your nagios conf.d directory, and check the config / restart your nagios.
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