Nagios xi Server Configuration Details Required

RIDS_I2MP · Post by **RIDS_I2MP** » Thu May 13, 2021 11:13 am

Hi Team,

We have below server level configuration for Nagios xi Servers with latest version installed on it.

Nagios Server Name IP Address CPU Memory
Nagios RIDS2 Production 10.144.223.155 8 16 GB
Nagios RIDS Production 10.144.223.156 8 16 GB
Nagios RIDS2 Non Production 10.147.108.45 8 16 GB
Nagios RIDS Non Production 10.147.108.46 8 16 GB

Could you please help me with number of Services/Servers threshold that can be Monitored & will not impact the Nagios application functionality/Performance.

Thanks
Nitin Parate

benjaminsmith · Post by **benjaminsmith** » Fri May 14, 2021 9:49 am

Hi,

This is a difficult question to answer since there are so many variables that can impact monitoring performance. In my experience the key variables that will impact server performance are:

1. Overall Check Load (# of hosts + service checks)
2. Check interval (how often is the server scheduling checks)
3. System Resources (Memory, CPU, Disk Speed)
4. Passive vs Active Checks
5. Performance Modifications
6. Plugins (some checks like SNMP require more resources than others)

A few questions:
1. Are you having performance trouble right now? If so, can you describe the problem?
2. Have you made any performance modifications (e.g. offloaded db, distributed setup...etc).
3. What is the anticipated growth of your network or how many more additional checks do you plan to add?

I'd like to get a system profile from each production server to take a closer look at the stats and any errors in the logs and then I can provide some recommendations.

Thanks,
Benjamin

### Download System Profile
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Login to the Nagios xi GUI using a web browser.
Click the "Admin" > "System Profile" Menu
Click the "Download Profile" button

RIDS_I2MP · Post by **RIDS_I2MP** » Fri May 14, 2021 10:47 am

Hi
Thanks for your updates.

We are not facing any issues at the moment. We are planning to add around 700-800 servers with 1000+ services in addition to existing 900 servers & 8400 services which are getting monitored via Nagios xi environment.

We have standard interval setup for all CPU, Memory, etc services, servers monitoring, SNMP devices etc.
I have attached System profile just for your reference.
So Just wanted to crosscheck if we reload the Environment with another 700-800 servers with 1000+ services will it cause impact.

There must be any standard thresholds defined by Nagios, So if you could help me with that details also that would be great.

Thanks
Nitin Parate

RIDS_I2MP · Post by **RIDS_I2MP** » Fri May 14, 2021 10:49 am

Attaching Profile

Moderator's Note: The profile has been shared with the support team but has been removed from the public forum.

benjaminsmith · Post by **benjaminsmith** » Mon May 17, 2021 10:52 am

Hi RIDS_I2MP,

Thanks for sending over the profile. The logs good but the top command is showing a higher than normal CPU load than what is normal for a system of this size with 8 CPU's.

top - 16:48:05 up 101 days, 8:35, 0 users, load average: 22.14, 24.25, 24.55

The main reason for this is almost all the MRTG service checks (which require more CPU than other plugins) have a check interval of 1 minute.

Code: Select all

check_command	check_xi_service_mrtgtraf!<redacted_436404224.rrd!20.00,20.00!32.00,32.00!G
check_interval	1.000000

Please use the Bulk Mods Tool, Configure > Tools > Bulk Mods Tool, to adjust the check interval for these services back to the default of 5 minutes. Then let the system run for a while and run the top command once more.

Best Regards,
Benjamin

RIDS_I2MP · Post by **RIDS_I2MP** » Tue May 18, 2021 3:18 am

Hi Team,

Could you please give more details about the MRTG service checks. Which services are being referred here.?

Also, I would like to know about the original concerns about how much load we should ideally allow (No.of Services/Hosts to be monitored) so that Nagios xi will work smoothly.

Thanks,
Nitin Parate

benjaminsmith · Post by **benjaminsmith** » Tue May 18, 2021 4:28 pm

Hi Nintin,

Since it's kind of hard to look this up in the CCM, here's a quick script that will print out all the services with a check interval of 1. Please update his to your API key and IP address of your Nagios xi system.

Code: Select all

import requests
import json
import re

# Update IP Address / API key with your server information

api = {'baseurl':'http://192.168.23.113/nagiosxi',
       'key':'?apikey=sCWXTQ3rHtm483AgRUUtLi04v5ECCVmktCCGoU8mINpPPflWafJbRKeGO8fGjUh6',
       'config_hosts': '/api/v1/config/host',
       'config_services': '/api/v1/config/service'  
       }


def get_api_data(url,endpoint,key):
    data = requests.get(url + endpoint + key, verify=False )
    return data

r = get_api_data(api['baseurl'],api['config_services'],api['key'])
services = r.json()

# Print out list of services with check interval set to 1 minute
 
print("Services with Check Interval Set to 1 Minute")
for service in services:
    if service['check_interval'] == '1':
            print('Host', service['host_name'], 'Service:', service['service_description'])

Alternatively, you can 'grep' the following file to find this data.

Code: Select all

/usr/local/nagios/var/objects.cache

Going back to the original question, given the higher load, I would not recommend adding many more services without making configuration/settings adjustments or adding more CPU's.

The following guides are very helpful for tuning Nagiso xi to handle more host and service checks.
https://assets.nagios.com/downloads/nag ... ios-xi.pdf
https://assets.nagios.com/downloads/nag ... zation.pdf

Regards,
Benjamin

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