Ping Issue with Website Monitor

[jamie87]

Hi,

I have just started trialing Nagios XI and add a "Website Monitor" via the 'Website (Monitor a website)' config wizard.

I am having an issue with the Ping service though, this is looping through being Up and Critical.
It is also reported as flapping.

If i ssh onto the server, i can ping the website address continuously without issue.

I haven't changed any of the configuration settings but if it helps, the command under the host is

Code: Select all

check_xi_service_http! -f ok -u "/" -S --sni -p 443

I also noticed the command box in the ping service is empty (not sure if this is to be expected)?

My primary aim is just to check if the website is up.
I am using running nagios on the provided 64 bit Hyper-V Image (Centos Stream 9)

Apologies if i'm missing something simple but not been about to find a solution searching this forum.
(or if i did, then didn't realise i was looking at the solution).

Any help is greatly appreciated.

Regards,
Jamie

[ajcoil]

Hello @jamie87,

Thank you for reaching out!

Have you attempted to run the check manually on your machines terminal? If so, what was returned?

[jamie87]

Hi,

I was able to ping continuously without issue from the server terminal.

Or do you you mean running a nagios specific command in the terminal?

Cheers,
Jamie

[kg2857]

I'd make a host check with check_ping or check_icmp, a service check on the httpd service and a check that verifies the web site returns a certain string.

[jamie87]

I'd make a host check with check_ping or check_icmp, a service check on the httpd service and a check that verifies the web site returns a certain string.

Thank you for your reply and apologies for my lack of knowledge on this but does this mean adding a new host (using the wizard or other method) or changing the current host command from:

Code: Select all

check_xi_service_http! -f ok -u "/" -S --sni -p 443

to something else?

Cheers,
Jamie



EDIT/UPDATE

I think i understand this a little better now, when using the Core Config Manager i can see the drop down options for check_ping and check_icmp so i decided to delete my website monitor and start again.

This time i added the host via CCM and havent added any services yet.

I have it set to use check_icmp "$USER1$/check_ping -H $HOSTADDRESS$ -w $ARG1$ -c $ARG2$"
arg1 = 100.0,20%
arg2 = 200.0,20%


So all i have is a single Host Check (check_icmp) and this keeps flipping between

Up - PING OK - Packet loss = 0%, RTA = 14.47 ms
and
Down - PING CRITICAL - Packet loss = 100%

EDIT 2

i have now noticed that i can replicate this issue directly in the linux terminal, basically when i start a ping to a website, it either works immediately and i will get 0% packet loss or sometimes it hangs for ages (only when starting the ping command) and then starts pinging so it seems that from my linux box, when starting a ping it sometimes hangs for a while but on other occasions works fine.

If it doesnt hang when i start the ping, it just works and never drops out, seems to be only when initiating the ping request


Here is an example of 2 different linux boxes hosted on the same hyper-v machine running pings started at the same time
The right side is the nagios vm (as you can see it didn't respond to the first 20 requests), left is a Kali vm that works continuously

ping.png

[jsimon]

Hi @jamie87,

It looks like your Nagios XI machine has over a 60 percent packet loss. Since you're able to confirm this happens at the CLI level as well as within XI, and you have other machines that do not have this issue, I believe the issue would be related to either network configuration on the XI machine you are using, or possibly a modem or switch issue.

[jamie87]

Hi,

Given the later test confirmed the ping working fine from another linux box which is also a VM on the same hyper-v machine, i am going to install Nagios XI from scratch on a fresh Ubuntu install rather than using the Nagios XI Hyper-V image and see how that gets on.

Thank you.

Cheers,
Jamie

[Owenpauly]

Hi,

I have just started trialing Nagios XI and add a "Website Monitor" via the 'Website (Monitor a website)' config wizard.

I am having an issue with the Ping service though, this is looping through being Up and Critical.
It is also reported as flapping.

If i ssh onto the server, i can ping the website address continuously without issue.

I haven't changed any of the configuration settings but if it helps, the command under the host is

Code: Select all

check_xi_service_http! -f ok -u "/" -S --sni -p 443

I also noticed the command box in the ping service is empty (not sure if this is to be expected)?

My primary aim is just to check if the website is up.
I am using running nagios on the provided 64 bit Hyper-V Image (Centos Stream 9)

Apologies if i'm missing something simple but not been about to find a solution searching this forum.
(or if i did, then didn't realise i was looking at the solution) strands hint

Any help is greatly appreciated.

Regards,
Jamie

Hi Jamie,

When I have problems with Nagios XI configuration for web monitoring, I usually troubleshoot by checking the network, service, and command settings.