Устанавливаем snmp на сервер:

apt-get install snmpd

Редактируем /etc/default/snmpd:

1. Удаляем "-u snmp"
2. Заменяем IP 127.0.0.1 адресом сервера. Например 172.16.0.5

Создаем нового пользователя my_username и mib. Пароль должен быть не менее 8 символов. Имя пользователя ТОЛЬКО буквы.

/etc/init.d/snmpd stop
echo rouser my_username priv >> /etc/snmp/snmpd.conf
echo "extend .1.3.6.1.4.1.2021.51 beancounters /bin/cat /proc/user_beancounters" >> /etc/snmp/snmpd.conf
echo "extend .1.3.6.1.4.1.2021.52 vzquota /bin/cat /proc/vz/vzquota" >> /etc/snmp/snmpd.conf
echo createUser my_username MD5 my_password DES >> /var/lib/snmp/snmpd.conf
/etc/init.d/snmpd start

Тестируем SNMP

snmpwalk -v 3 -u my_username -l authPriv -a MD5 -A my_password -x DES -X my_password $(hostname -i)

Добавляем конфигурацию в Nagios2:

define command {
  command_name check_snmp_openvz_on_port
  command_line /usr/local/bin/check_snmp_openvz.sh $HOSTADDRESS$ $ARG1$ $ARG2$ $ARG3$
  }

define host {
  host_name openvz-server
  alias Server Openvz
  address 172.16.0.5
  use generic-host
  contact_groups admins
  }

define service{
  use generic-service
  host_name openvz-server
  service_description Virtual Machines Limits
  check_command check_snmp_openvz_on_port!161!my_username!my_password
  max_check_attempts 1
  }

Дальше создаем скрипт /usr/local/bin/check_snmp_openvz.sh

#!/bin/bash
HOST=$1
PORT=$2
USER=$3
PASS=$4
export FILE=/tmp/$HOST.beancounters
RET=0   DATA_TMP=`snmpwalk   -v 3  -u $USER -l authPriv   -a MD5 -A $PASS -x DES -X $PASS $HOST:$PORT .1.3.6.1.4.1.2021.51.4`
if [ "$?" != "0" ]; then
        echo "Unknown snmp error"
        exit 1
fi   DATA=`echo "$DATA_TMP"| perl -ne '/"(.*)"/ ; print "$1\n" ;'`   if [ -f $FILE ]; then
echo "$DATA" | perl  -n -e'
use Data::Dumper;
my $file=$ENV{"FILE"};
my $ret=0 ;
my $vid ;
my $resource ;
my $held ;
my $maxheld ;
my $barrier ;
my $limit ;
my $failcnt ;
my %beancounters ;
my %beancounters_old ;
while(<STDIN>){
        my %vmachine;
        if ( /\D*(\d+):.*/ ){ $vid=$1; $beancounters{$vid}=\%vmachine ; }
        if ( /^[\W\d]+([a-z]+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+).*/ ) {
                $resource=$1 ;
                $held=$2 ;
                $maxheld=$3 ;
                $barrier=$4 ;
                $limit=$5 ;
                $failcnt=$6 ;
                ${beancounters{$vid}}{$resource}=[$held , $maxheld , $barrier , $limit ,$failcnt ];
                if ( ($held  > $barrier) && ($barrier != 0) ) {
                        print "WARNING: Limits on $vid: $resource  held->$held , barrier->$barrier ( limit->$limit ) " ;
                        $ret=1;
                }
        }
}   # read and parse old data
open(MYINPUTFILE, "<$file");
while(<MYINPUTFILE>){
        my %vmachine;
        if ( /\D*(\d+):.*/ ){ $vid=$1; $beancounters_old{$vid}=\%vmachine ; }
        if ( /^[\W\d]+([a-z]+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+).*/ ) {
                $resource=$1 ;
                $held=$2 ;
                $maxheld=$3 ;
                $barrier=$4 ;
                $limit=$5 ;
                $failcnt=$6 ;
                ${beancounters_old{$vid}}{$resource}=[$held , $maxheld , $barrier , $limit ,$failcnt ];
        }
}   foreach my $vmachine_id (keys %beancounters) {
        foreach my $resource (keys %{$beancounters{$vmachine_id}} ) {
                if ( defined($beancounters{$vmachine_id}{$resource}[4]) && defined($beancounters_old{$vmachine_id}{$resource}[4]) ){
                        my $failcnt=$beancounters{$vmachine_id}{$resource}[4];
                        my $failcnt_old=$beancounters_old{$vmachine_id}{$resource}[4];
                        my $held=$beancounters{$vmachine_id}{$resource}[0];
                        my $maxheld=$beancounters{$vmachine_id}{$resource}[1];
                        my $barrier=$beancounters{$vmachine_id}{$resource}[2];
                        my $limit=$beancounters{$vmachine_id}{$resource}[3];
                        if ( $failcnt_old < $failcnt ){
                                print "CRITICAL: Incrased failcnt  $vmachine_id: $resource from $failcnt_old to $failcnt (held->$held , maxheld->$maxheld , barrier->$barrier , limit->$limit ) " ;
                                $ret=2;
                        }
                }
        }   }   # if ($ret == 0 ) { print "Ok. \n" ; }
# print Dumper(%beancounters_old) ;
# print "\n";
exit($ret);
'   RET1=$?
fi   echo "$DATA" > $FILE
#####################################################################################
######### quota check
#####################################################################################   DATA=`snmpwalk   -v 3  -u $USER -l authPriv   -a MD5 -A $PASS -x DES -X $PASS $HOST:$PORT .1.3.6.1.4.1.2021.52.4 \
|  perl -ne '/"(.*)"/ ; print "$1\n" ;'`   if [ "$?" != "0" ]; then
        echo "Unknown snmp error"
        exit 1
fi     echo "$DATA" | perl  -n -e'
my $vid ;
my $ret=0 ;
while(<STDIN>){
        my %vid;
        if ( /\D*(\d+):.*/ ){ $vid=$1; }
        if ( /\s*(\S+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+).*/ ){
                $resource=$1 ;
                $usage=$2 ;
                $softlimit=$3 ;
                $hardlimit=$4 ;
                $time=$5 ;
                $expire=$6 ;
                if ( $usage >= $softlimit ){
                        print "WARNING: VZquota limit exceeded on $vid: $resource  usage->$usage, softlimit->$softlimit, hardlimit->$hardlimit, time->$time, expire->$expire  " ;
                        $ret=1;
                }
        }
}
exit($ret);
'
RET2=$?   #####################################################################################
########### return
#####################################################################################   if [  $RET1  -gt $RET2  ]; then
        RET=$RET1
        else
        RET=$RET2
fi   if [  $RET  = 0  ]; then
        echo Ok.
fi
exit $RET

После этого в Nagios2 появится мониторинг использования ресурсов виртуальных серверов.

Оценить эту запись: