Is a Url content check with more than one redirect possible?

[techgeek]

Hi - Relatively new to NagiosXI and strugling with one url check. Details are:

NagiosXI 5.6.13
(nagios-plugins 2.2.1)

Using the Website URL check to monitor a url and match content this works fine on all the urls that only have one redirect. Redirect is set to follow and content match to look for text found on a terms and conditions page. If I run the check, it fails and the page appears to look for the text in is is actually the 1st redirect of 2 to the actual site (No idea why it was set this way it's somebody elses creation).

So without posting the url in here for privacy reasons is there any way to force the check_xiservice_http to hang in there until it gets to the page it needs to read the content from?

the check in $ARG1$ looks like the below if that helps

-s "This website does" -f follow -I x.x.x.x -u "/hxxxx/xxx-xxx-game" -S --sni -p 443

the error I get looks like the below (makes no difference if I use port 80 on the end or 443)

HTTP CRITICAL: HTTP/1.1 200 OK - string 'This website does' not found on 'http://www.xxxxx.com:80/hxxxx/404Redire ... x.com/xxxx' - 11847 bytes in 0.360 second res

[ssax]

I'm able to replicate that behavior, I don't see a solution with check_http, it's likely a bug as the code looks like it's supposed to support up to 15 redirects by default.

I've filed a bug report here:

Code: Select all

https://github.com/nagios-plugins/nagios-plugins/issues/540

Feel free to add any additional info.

You would likely need to find another plugin to check it, something like this should work:

https://exchange.nagios.org/directory/P ... tp/details

[techgeek]

We tried a few of the curl plugins but we did not have much luck so what we did was to create a custom check ourselves and stored it in the path /usr/local/nagios/libexec

I presume it is ok to post the details of the script here as it may help others in the future?

[scottwilkerson]

We tried a few of the curl plugins but we did not have much luck so what we did was to create a custom check ourselves and stored it in the path /usr/local/nagios/libexec

I presume it is ok to post the details of the script here as it may help others in the future?

Sure please do, this may help others in the future until the bug is resolved

Thanks!

[techgeek]

To make your own command to use curl (you may need to have curl installed on your server ) to follow redirects and then look for specific text at the destination site to confirm it is up:

Step 1
Create a command in Core Config Manager?Commands using the following

Command Name
check_mycustom_curl

Command Line
$USER1$/check_mycustom_curl $ARG1$

command type
Check command

Active
Check the box

Save

Step 2
Login to Nagios XI server via ssh (change to root) and create the following script using the command

vi /usr/local/nagios/libexec/check_mycustom_curl

Code: Select all

#!/bin/bash

URL=$1
SEARCH=$2


RESULT=$(curl -L $URL | grep -i "$SEARCH" | wc -l)
RESULT1=$(curl -L $URL | grep -i '$SEARCH')


if [ "$RESULT" -ge 1 ]; then
   echo Site is UP $URL
    exit 0

else

if [ "$RESULT" -lt 1 ] ; then
   echo Site is Down $URL
   echo $RESULT1
    exit 2

fi
fi

Save the file and exit

Add the same permissions as all the other checks in same path

chmod 775 /usr/local/nagios/libexec/check_mycustom_curl

chown apache:nagios /usr/local/nagios/libexec/check_mycustom_curl

Step 3
Then use the Configuration wizard to create a website monior - fill in the boxes you want as normal and save at the end.

Step 4
Go back to Core Config Manager and then click services and find the url check you just created and edit it.
Change the "Check Command" to select the new "check_mycustom_curl" command you made earlier.

In the $ARG1$ box paste in the website you want to monitor plus a space and then the text you expect to find when the site is up in ""
e.g.

http://www.mysite.com "text to match"

Save and test as needed.

[scottwilkerson]

Thanks for sharing!

Locking thread as resolved