Nagios Optimization on CentOS

[mpedersen at choopa.com]

Hello.

I've installed Nagios Core 3.3.1, and can't get it to run very fast at
all.

Machine specs:
OS: CentOS 5.7
Processor: Intel(R) Xeon(R) CPU           E5420  @ 2.50GHz (8 cores)
RAM: 8G
HD: 800G, 22G used

Going by top, the load average of the machine hovers around 1.5-2.0. CPU
usage is around 12% across all cores. Memory usage shows about 7.5G being
used for buffers, so memory is actually pretty unused too.

The reason this seems incredibly underused to me is because we have 6000
hosts we're pinging. Total time for this check is around 6-7 minutes.
Considering the lack of load on this box, I'm pretty sure we can improve
the total time significantly.

We are going to aim for distributed monitoring, we're just not there yet.
I figure that's going to take another week or two for me to be comfortable
implementing.

I'm also attaching the main nagios.cfg file. If there's more information
that's needed, please let me know.


=====nagios.cfg=====
accept_passive_service_checks=1
admin_email=nagios
admin_pager=pagenagios
broker_module=/usr/local/nagios/bin/ndomod.o
config_file=/usr/local/nagios/etc/ndomod.cfg
cfg_file=/usr/local/nagios/etc/checkcommands.cfg
cfg_file=/usr/local/nagios/etc/contactgroups.cfg
cfg_file=/usr/local/nagios/etc/contacts.cfg
cfg_file=/usr/local/nagios/etc/hostgroups_auto.cfg
cfg_file=/usr/local/nagios/etc/hostgroups.cfg
cfg_file=/usr/local/nagios/etc/hostgroups_network_auto.cfg
cfg_file=/usr/local/nagios/etc/hosts_auto.cfg
cfg_file=/usr/local/nagios/etc/hosts.cfg
cfg_file=/usr/local/nagios/etc/hosts_nrpe.cfg
cfg_file=/usr/local/nagios/etc/hosts_routers_auto.cfg
cfg_file=/usr/local/nagios/etc/hosts_switches_auto.cfg
cfg_file=/usr/local/nagios/etc/misccommands.cfg
cfg_file=/usr/local/nagios/etc/nrpe_auto.cfg
cfg_file=/usr/local/nagios/etc/services_auto.cfg
cfg_file=/usr/local/nagios/etc/services.cfg
cfg_file=/usr/local/nagios/etc/services_cisco.cfg
cfg_file=/usr/local/nagios/etc/services_manual.cfg
cfg_file=/usr/local/nagios/etc/services_nrpe.cfg
cfg_file=/usr/local/nagios/etc/services_routers_auto.cfg
cfg_file=/usr/local/nagios/etc/services_switches_auto.cfg
cfg_file=/usr/local/nagios/etc/timeperiods.cfg
check_external_commands=1
check_for_orphaned_hosts=1
check_for_orphaned_services=1
check_result_reaper_frequency=2
check_service_freshness=1
command_check_interval=-1
command_file=/usr/local/nagios/var/rw/nagios.cmd
date_format=us
enable_embedded_perl=1
enable_event_handlers=1
enable_flap_detection=0
enable_notifications=1
enable_predictive_host_dependency_checks=1
enable_predictive_service_dependency_checks=1
event_handler_timeout=30
execute_host_checks=1
execute_service_checks=1
external_command_buffer_slots=4096
freshness_check_interval=60
high_host_flap_threshold=20.0
high_service_flap_threshold=20.0
host_check_timeout=30
host_inter_check_delay_method=n
host_perfdata_command=process-host-perfdata
host_perfdata_file_mode=a
host_perfdata_file_processing_command=process-host-perfdata-file
host_perfdata_file_processing_interval=15
host_perfdata_file_template=DATATYPE::HOSTPERFDATA\tTIMET::$TIMET$\tHOSTNAME::$HOSTNAME$\tHOSTPERFDATA::$HOSTPERFDATA$\tHOSTCHECKCOMMAND::$HOSTCHECKCOMMAND$\tHOSTSTATE::$HOSTSTATE$\
tHOSTSTATETYPE::$HOSTSTATETYPE$
host_perfdata_file=/usr/local/pnp4nagios/var/host-perfdata
illegal_macro_output_chars=`~$&|'"<>
illegal_object_name_chars=`~!$%^&*|'"<>?,()=
interval_length=60
lock_file=/usr/local/nagios/var/nagios.lock
log_archive_path=/usr/local/nagios/var/archives
log_event_handlers=1
log_external_commands=1
log_file=/usr/local/nagios/var/nagios.log
log_host_retries=1
log_initial_states=1
log_notifications=1
log_rotation_method=d
log_service_retries=1
low_host_flap_threshold=5.0
low_service_flap_threshold=5.0
max_check_result_reaper_time=10
max_concurrent_checks=0
max_host_check_spread=2
max_service_check_spread=2
nagios_group=nagios
nagios_user=nagios
notification_timeout=30
obsess_over_services=0
ocsp_timeout=5
perfdata_timeout=5
process_performance_data=1
retain_state_information=1
retention_update_interval=60
service_check_timeout=60
service_inter_check_delay_method=n
service_interleave_factor=10
service_perfdata_command=process-service-perfdata
service_perfdata_file_mode=a
service_perfdata_file_processing_command=process-service-perfdata-file
service_perfdata_file_processing_interval=15
service_perfdata_file_template=DATATYPE::SERVICEPERFDATA\tTIMET::$TIMET$\tHOSTNAME::$HOSTNAME$\tSERVICEDESC::$SERVICEDESC$\tSERVICEPERFDATA::$SERVICEPERFDATA$\tSERVICECHECKCOMMAND::
$SERVICECHECKCOMMAND$\tHOSTSTATE::$HOSTSTATE$\tHOSTSTATETYPE::$HOSTSTATETYPE$\tSERVICESTATE::$SERVICESTATE$\tSERVICESTATETYPE::$SERVICESTATETYPE$
service_perfdata_file=/usr/local/pnp4nagios/var/service-perfdata
sleep_time=1
state_retention_file=/usr/local/nagios/var/status.sav
status_file=/usr/local/nagios/var/status.log
status_update_interval=15
temp_file=/usr/local/nagios/var/nagios.tmp
use_agressive_host_checking=0
use_large_installation_tweaks=1
use_retained_program_state=0
use_syslog=0


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