run curl on a remote server and collect response

[kellyangell]

Hello

I am trying to run a command "curl (web address)" on a remote machine to see if it can connect to the BE machine. can you please send me some instructions or maybe a link to a plugin so i can do this. the check_curl plugin is running it from the nagios machine , but i don't want that , i want nagios to connect to the remote machine and run the curl command from there. using NRPE .

I hope you can help
Thanks

This is the command definition i am running and i am getting back , check_curl not defined but it is defined !
define service {
use generic-service
host_name iceLIVEfe02
service_description FE to BE via NGINX
check_command check_nrpe!check_curl!http://localhost:1080/iceserver/rest/apiv1/booking/info

# 'check_curl' command definition
define command{
command_name check_curl
command_line $USERS1$/check_nrpe -H $HOSTADDRESS$ check_curl -U $ARG1$
}

[rkennedy]

Code: Select all

# 'check_curl' command definition
define command{
command_name check_curl
command_line $USERS1$/check_nrpe -H $HOSTADDRESS$ check_curl -U $ARG1$
}

You actually want to turn this into a NRPE command definition on the CLIENT machine since we're calling, in your case -

Code: Select all

command[check_curl]=/path/to/your/plugin/check_curl $ARG1$

(usually this file is in /usr/local/nagios/etc/nrpe.cfg)

Then restart xinetd or nrpe depending on how you installed it on the client machine, and try once again.

[kellyangell]

great thanks , that works . next question , when i run this command on the server directly , this is the response we get to know that its working
"Booking with Spring 4.2.4.RELEASE"

how can i get nagios to monitor its OK if we get this "Booking with Spring 4.2.4.RELEASE" and if we don't the service is CRITICAL ??

[rkennedy]

Could you post check_curl for us to look at? If it doesn't have the feature built in then you're a bit limited, but you could probably create your own wrapper around it.

Something like this -

Code: Select all

#!/bin/bash
myvar=$(/usr/local/nagios/libexec/check_curl yourvars | grep 'Booking with Spring' | wc -l)
...
...

This would set it to 1 if it detected the word, and 0 if not. Just define the logic.

check_http has this built in using the -r,-R, or -s flags.

Code: Select all

 -s, --string=STRING
    String to expect in the content
 -r, --regex, --ereg=STRING
    Search page for regex STRING
 -R, --eregi=STRING
    Search page for case-insensitive regex STRING

[kellyangell]

hello

i downloaded this from your nagios website , thanks for your great response , have a look and see what you think

thanks kelly

[kellyangell]

EDIT: Please wrap in code blocks

hi

the check_curl does have the search string included , but i have tried some variations , not too sure how to define it

Code: Select all

--------- check_curl_http.php v1.0, 06.06.2012 ---------
\n
 Syntax:
    -U URL
    -A Agent (default: Mozilla/5.0 ... )
    -a authentication [user]:[password]
    -G Grep page on STRING (can be set multiple times for searching different strings)
    -L Show page 
    -F Follow redirects 
    -I Ignore SSL certificate errors 
    -X Exclude performance data (default: include)
    -Tc Ccritical page return time (seconds)
    -Tw Warning page return time (seconds)
    -Sbc Critical page size below SIZE (bytes)
    -Soc Critical page size over SIZE (bytes)
    -Sbw Warning page size below SIZE (bytes)
    -Sow Warning page size over SIZE (bytes)
    -S Find string between ARG1 and ARG2, return first match (s s) (example: value=\" \" )
    -T Timeout (seconds)(default: 10sec)
    -O Output Driven Check - Page Should respond with \"Status: OK\" or otherwise
    -P HTTP proxy to tunnel request through [proxyname]:[port]
    -Pu Authentication credentials for proxy [username]:[password]
    -Pa Authentication method used for proxy connection. Either CURLAUTH_BASIC or CURLAUTH_NTLM
    -Pt Either CURLPROXY_HTTP (default) or CURLPROXY_SOCKS5
    -C Specify OK http status code. By default, this is 200
\n\n Examples:
  check_curl_http.php -U http://test.example.net
  check_curl_http.php -U https://test.example.net -P myproxy.company.com:8080 -Pu proxyuser:password -F -G somesearchstring\n\n";

[avandemore]

Did you read the BestPractice.txt included with the plugin?

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

[kellyangell]

i have solved the issue by writing my own plugin, wasn't sure it would work at first , but sometimes the simple way around is the best one. its working , thanks for your help ,with this issue. you can close this as solved .
kelly

[rkennedy]

Sounds good, feel free to post it on our Exchange for others to see!

https://exchange.nagios.org