Monitor localhost URL

[apteancloud]

Hi,

Is there a way to monitor localhost URLs. I want to monitor http://localhost:51011/api/status. How do I set it up?
Its a Windows host machine and we are using nsclient++

Regards

[ssax]

You should be able to add a plugin to the windows nsclient host, define the command in the nsclient.ini, and then call the plugin and pass in the URL and it should do it.

What specifically are you trying to monitor at that web address, just that it's up? Or some specific content? What specifically?

I found this that may work for you:

https://www.claudiokuenzler.com/blog/685/simple-http-check-monitoring-plugin-windows-check_http-alternative

[apteancloud]

Basically, the host machine where that URL is set in such a way, it can only be accessed at localhost, not as a public endpoint. In which case, I would have used check_http.
So, from the host machine, if I hit http://myhost.local:51011/api/status or http://localhost:51011/api/status, it gives me output as:

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{"status":"Started","startTime":"2021-03-26T08:34:50.873063Z","appserverURL":"AppServer://myhost.local:5162/TEST_WC","scalingInterval":1000,"cleanupInterval":10000,"stateServerPortRangeStart":58100,"stateServerMaxInstances":40,"stateServerMinInstances":30,"stateServerPrestartedInstances":30,"stateServerPrestartRampUp":1,"stateServerEnablePrestart":false,"stateServerTenant":"Test-Host","stateServerStartupTimeout":1800000}


What I am trying to achieve with this check is a regex search for keyword "Started". If found, all OK.

[vtrac]

Hi,
Hope you are having a good day!!

What happens if you run "check_http" from your XI command prompt:
(NOTE: x.x.x.x is your remote windows IP address)

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/usr/local/nagios/libexec/check_http -H x.x.x.x -p 51011 -u '/api/status' -U -v


If the above does not work, then I would suggest that you write a powershell script and call its from your XI machine.


Best Regards,
Vinh

[apteancloud]

When I run the command you mentioned, this is what I get:

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[nagios@NagiosXIAzDev ~]$ /usr/local/nagios/libexec/check_http -H 10.179.3.25 -p 51011 -u '/api/status' -U -v
connect to address 10.179.3.25 and port 51011: Connection refused
HTTP CRITICAL - Unable to open TCP socket

The output from the remote server is:

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{"status":"Started","startTime":"2021-04-30T08:28:54.4085873Z","appserverURL":"AppServer://APPSRVURL","scalingInterval":500,"cleanupInterval":10000,"stateServerEnablePrestart":false,"stateServerTenant":"Live","stateServerStartupTimeout":1800000}

And from there I want to do a regex for "Started" and "scalingInterval". If found, Nagios will say OK, else CRITICAL.

On the Powershell side, I can write something like this and it gives me the JSON output:

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PS C:\Program Files\NSClient++\scripts> (Invoke-WebRequest http://APPSRVURL:51010/api/status).Content
{"status":"Started","startTime":"2021-04-30T08:28:54.4085873Z","appserverURL":"AppServer://APPSRVURL","scalingInterval":500,"cleanupInterval":10000,"stateServerEnablePrestart":false,"stateServerTenant":"Live","stateServerStartupTimeout":1800000}

But how do I make Nagios talk and capture that PowerShell output and give me an OK/CRITICAL state?

[vtrac]

Hi,
First, let see if you can "ping" the remote host from your XI machine.
Please open a command prompt from your XI machine (please update outputs or screenshots):

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ping 10.179.3.25


If you are able to "ping 10.179.3.25", then run the below command and see if port "51011" open from your XI to your remote machine:
(please post outputs or screenshots)

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nmap -Pn -p 51011 10.179.3.25


Also, please upload the "profile.zip":
Admin > System Config > System Profile > "Download profile"

Best Regards,
Vinh

[apteancloud]

Outputs:

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CHS_Admin@NagiosXIAzPrd:~$ ping 10.179.3.25
PING 10.179.3.25 (10.179.3.25) 56(84) bytes of data.
64 bytes from 10.179.3.25: icmp_seq=1 ttl=128 time=0.916 ms
64 bytes from 10.179.3.25: icmp_seq=2 ttl=128 time=0.958 ms
64 bytes from 10.179.3.25: icmp_seq=3 ttl=128 time=0.902 ms
64 bytes from 10.179.3.25: icmp_seq=4 ttl=128 time=1.29 ms
64 bytes from 10.179.3.25: icmp_seq=5 ttl=128 time=0.894 ms
64 bytes from 10.179.3.25: icmp_seq=6 ttl=128 time=1.14 ms
64 bytes from 10.179.3.25: icmp_seq=7 ttl=128 time=13.4 ms
64 bytes from 10.179.3.25: icmp_seq=8 ttl=128 time=0.905 ms
64 bytes from 10.179.3.25: icmp_seq=9 ttl=128 time=0.952 ms
64 bytes from 10.179.3.25: icmp_seq=10 ttl=128 time=0.843 ms
^C64 bytes from 10.179.3.25: icmp_seq=11 ttl=128 time=0.952 ms
64 bytes from 10.179.3.25: icmp_seq=12 ttl=128 time=0.934 ms
^C
--- 10.179.3.25 ping statistics ---
12 packets transmitted, 12 received, 0% packet loss, time 11095ms
rtt min/avg/max/mdev = 0.843/2.013/13.464/3.454 ms


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CHS_Admin@NagiosXIAzPrd:~$ nmap -Pn -p 51011 10.179.3.25

Starting Nmap 7.60 ( https://nmap.org ) at 2021-05-12 14:07 UTC
Nmap scan report for 10.179.3.25
Host is up (0.00091s latency).

PORT      STATE  SERVICE
51011/tcp closed unknown

Nmap done: 1 IP address (1 host up) scanned in 0.15 seconds


I can hit the site on the remote server though.

Capture1.JPG

[vtrac]

Hi,
See if you can talk to your network admin to open port "51011".

Can you try this on your XI command prompt? .... (NOTE: x.x.x.x is the remote windows IP address)

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curl -k -L -vvv "http://x.x.x.x:51011/api/status"


Using "check_http" is the easiest if you can get port "51011" open.


Regards,
Vinh

[apteancloud]

Hi,

Opening Port was denied

Any other suggestions?

[vtrac]

Hi,
Can you run the below command on your XI command prompt?

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curl -k -L -vvv "http://x.x.x.x:51011/api/status"


Regards,
Vinh