CACTI VIA PROXY

[Maher457]

hello is there any way to supervise internet from cacti via proxy?because now i supervise it directly via a firewall and directly to the internet.
Thanks

[TheWitness]

Attach a picture,

[Maher457]

In my society from our post we have an account that will redirect us to proxy and we pass to internet via proxy
with my cacti on my post i measure the HTTP response time of a website.
But cacti don't pass by a proxy it pass directly to internet.So it's complicated to give cacti an account and tell it to pass via a proxy i don't how to do.
Do you know what should i do?
or do u have another solution that cacti that measure the time of HTTP response and graph it from my post
Thank you

[TheWitness]

Well your first problem is that you will get false positives if you are going through a proxy. So, you might have to go to a push type method. However, I imagine that you will have even more issues related to getting data 'in' from the internet.

If the proxy is automatic and requires no authentication, you will have to setup a port that does not cache responses on the proxy and use that for your response time request. Then it becomes no different than a firewall.

TheWitness

[phalek]

I guess if you are able to control the content of the webpage ( e.g. adding meta headers to tell the proxy not to cache it, always provide some dynamic content etc.) caching shouldn't be too much of a concern ?

For the auth, you could use a script which goes and fetches the webpage and returns a number you can use to put into cacti ( Data inpuit methods ...)

The following perl code works for NTLM based proxies, too ...

Code: Select all

#!/usr/bin/perl
use LWP::UserAgent;
use HTTP::Request::Common;
use Time::HiRes qw { time };

# Get the arguments from command line, or set them static here.
$proxyServer = $ARGV[0];
$proxyPort = $ARGV[1];
$url = $ARGV[2];

# Username/Password, for NTLM Auth use the following format
$proxyUsername="DOMAIN\\Username";
$proxyPassword="password";


# Set up the ntlm client
# and then the base64 encoded ntlm handshake message
$ua = new LWP::UserAgent(keep_alive=>1);
$ua->proxy(http  => 'http://'.$proxyServer.':'.$proxyPort);

# Set the proxy and credentials to use for that proxy.
$netloc = "$proxyServer:$proxyPort";
$ua->credentials($netloc, '', $proxyUsername, $proxyPassword);

my $startTime = time();

# Start the URL retrieval
$request = GET $url;
$response = $ua->request($request);
# End of URL retrieval

$totaltime = time() - $startTime;
if ($response->is_success) {
    print $totaltime;
}
else {
    print "U";
}

[TheWitness]

Almost indistinguishable from PHP these days

TheWitness

[phalek]

Yeah

[Maher457]

Thank you for your script that's exactly what i need but i didn't understand where to put ur script.
I'm doing a measure of HTTP response time that i found in the forum.
here's the code it's called http_nrpe.pl and it uses a file check_http
i have attached this script.
should i put ur script in the http_nrpe.pl down the already existing code?or where?
please help
thank you

[phalek]

I would change the input string to:

Code: Select all

perl <path_cacti>/scripts/proxiedHttpCheck.pl 10.0.10.1 8080 <ip>

where "proxiedHttpCheck.pl" is the script posted by me,
"10.0.10.1" needs to be your proxy server
"8080" is the port of your proxy.

that should do it.

[Maher457]

so i have to put the script code before or after the code aldready exsisting nrpe_http.pl?
i didnt understand what i should change in ur code can u give the full code please?
thank you

[phalek]

The code is complete so far.
You only need to change the following lines:

Code: Select all

# Username/Password, for NTLM Auth use the following format
$proxyUsername="DOMAIN\\Username";
$proxyPassword="password"; 

And you do not need to exectue/call the check_http file or the nrpe_http.pl file.

[Maher457]

i undertand ur point but i want to have one graph of http response time without proxy and another one via proxy.
What should i do to keep the two.
it's complicated what should i place as a XML file to have the date source and the data template
please help

[Maher457]

u see below the xml file what should i do now to create a nez graph template and associate the scripts to it
please give me a procedure to create it
tahnk you very much

[phalek]

hoestly, I would just go through the documentation and create another data input mehtod, data template and graph template:

http://docs.cacti.net/manual:087:3a_adv ... put_method

[Maher457]

thanks for ur instructions i followed them and put ur script in the script directory and modify the user and pass for the proxy
but i have no graph
in cacti log i have this error:

SPINE: Poller[0] Host[248] ERROR: Empty result [website ip adress]: 'perl /var/www/html/scripts/proxiedHttpCheck.pl [proxy IP] 8080 [website ip adress]'

when i run ur scipt in a console it didn-t recogniwe the "Use" syntax!!
please i need ur help