Nagios – Monitor VMware vSphere Hypervisor 5.5

Proviamo a monitare tramite nagios un server su cui è installato un VMWare vSphere Hypervisor (ESXi) 5.5; installiamo prima di tutto i prerequisiti:

# yum -y install openssl-devel perl-Archive-Zip perl-Class-MethodMaker \
   uuid-perl perl-SOAP-Lite perl-XML-SAX perl-XML-NamespaceSupport \
   perl-XML-LibXML perl-MIME-Lite perl-MIME-Types perl-MailTools perl-TimeDate \
   uuid libuuid perl-Data-Dump perl-UUID cpan perl-Crypt-SSLeay \
   perl-Params-Validate perl-YAML perl-Config-Tiny
# cpan Test::More
# cpan Nagios::Plugin

È necessario installare il vSphere SDK for Perl 5.5 versione 64 bit; una volta scaricato dal sito della VMWare e messo il package nella directory /usr/src, provvediamo ad installarlo:

# cd /usr/src
# tar xvfz VMware-vSphere-Perl-SDK-5.5.0-1384587.x86_64.tar.gz
# cd vmware-vsphere-cli-distrib/
# ./vmware-install.pl

Copiamo il seguente script nella directory dei plugins (/usr/local/nagios/libexec); questo è il comando principale che viene usato per effettuare i check del nostro sistema; cambiamogli i diritti con 755:

# chmod 755 /usr/local/nagios/libexec/check_vmware_api.pl

Definiamo il nostro host; editiamo il nuovo file /usr/local/nagios/etc/objects/esxi.cfg

###############################################################################
# HOST DEFINITION
###############################################################################
define host{
        use                     linux-server
        host_name               esxi-01
        address                 192.168.44.44
        }

###############################################################################
# HOST GROUP DEFINITION
###############################################################################
define hostgroup{
        hostgroup_name          vmware-servers
        alias                   VMWare  Servers
        members                 esxi-01
        }

###############################################################################
# SERVICESGROUP DEFINITIONS
###############################################################################
define servicegroup{
        servicegroup_name       esxiservice
        alias                   ESX/ESXi Services
        }

###############################################################################
# SERVICE DEFINITIONS
###############################################################################
define service{
        use                     local-service
        host_name               esxi-01
        service_description     PING
        check_command           check_ping!100.0,20%!500.0,60%
        }


#============== VMWare Service check
# check cpu
define service{
        use                     generic-service
        host_name               esxi-01
        service_description     ESXi CPU Load
        check_command           check_esx_cpu!80!90
        servicegroups           esxiservice
        }

# check memory usage
define service{
        use                     generic-service
        host_name               esxi-01
        service_description     ESXi Memory usage
        check_command           check_esx_mem!80!90
        servicegroups           esxiservice
        }

# check net
define service{
        use                     generic-service
        host_name               esxi-01
        service_description     ESXi Network usage
        check_command           check_esx_net!102400!204800
        servicegroups           esxiservice
        }

# check runtime status
define service{
        use                     generic-service
        host_name               esxi-01
        service_description     ESXi Runtime status
        check_command           check_esx_runtime
        servicegroups           esxiservice
        }

# check io read
define service{
        use                     generic-service
        host_name               esxi-01
        service_description     ESXi IO read
        check_command           check_esx_ioread!40!90
        servicegroups           esxiservice
        }

# check io write
define service{
        use                     generic-service
        host_name               esxi-01
        service_description     ESXi IO write
        check_command           check_esx_iowrite!40!90
        servicegroups           esxiservice
        }

Facciamo in modo che nagios carichi la nuova configurazione, inserendo nel file /usr/local/nagios/etc/nagios.cfg la seguente riga:

cfg_file=/usr/local/nagios/etc/objects/esxi.cfg

Modifichiamo il file /usr/local/nagios/etc/resource.cfg per inserire all’interno le credenziali di accesso al server esxi, affinchè possano essere usate al momento del check (USER11 è la username e USER12 è la password):

$USER11$=root
$USER12$=123456

Aggiungiamo al file dei comandi (/usr/local/nagios/etc/objects/commands.cfg) le seguenti sezioni:

# ESXi 5.5 TEST COMMAND
# check cpu
define command{
        command_name check_esx_cpu
        command_line $USER1$/check_vmware_api.pl -H $HOSTADDRESS$ -u $USER11$ -p $USER12$ -l cpu -s usage -w $ARG1$ -c $ARG2$
        }

# check memory usage
define command{
        command_name check_esx_mem
        command_line $USER1$/check_vmware_api.pl -H $HOSTADDRESS$ -u $USER11$ -p $USER12$ -l mem -s usage -w $ARG1$ -c $ARG2$
        }

# check net usage
define command{
        command_name check_esx_net
        command_line $USER1$/check_vmware_api.pl -H $HOSTADDRESS$ -u $USER11$ -p $USER12$ -l net -s usage -w $ARG1$ -c $ARG2$
        }

# check runtime status
define command{
        command_name check_esx_runtime
        command_line $USER1$/check_vmware_api.pl -H $HOSTADDRESS$ -u $USER11$ -p $USER12$ -l runtime -s status
        }

# check io read
define command{
        command_name check_esx_ioread
        command_line $USER1$/check_vmware_api.pl -H $HOSTADDRESS$ -u $USER11$ -p $USER12$ -l io -s read -w $ARG1$ -c $ARG2$
        }

# check io write
define command{
        command_name check_esx_iowrite
        command_line $USER1$/check_vmware_api.pl -H $HOSTADDRESS$ -u $USER11$ -p $USER12$ -l io -s write -w $ARG1$ -c $ARG2$
        }

Testiamo se la configurazione appena creata abbia dei problemi, ed in caso negativo, ricarichiamo la configurazione del nagios:

# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
# service nagios reload

La soluzione finale sarà la seguente:

← Nagios plugins