[smokeping-users] Smokeping probe with Rasberrypi (Rasbian/Debian) problem + solution. Do you have a better one perhaps?

[ITheodoridis at bankofgreece.gr]

Hello.

I have recently started experimenting with running a smokeping probe on
a Rasberrypi box (it's a mini pc board, which can run linux booting from
an sd card, and comes with network interface and usb ports, etc. The
Rasberrypi's card is loaded with a customized version of Debian called
Rasbian. I have added the packages needed for the libraries (fping,
echoping, the perl libraries, etc) and have tried both adding the
package for smokeping (with apt-get) and compiling from source (after of
course removing the packaged version).

When I try to run a probe on it using this command line

./bin/smokeping --master-url=http://<myserver>/cgi-bin/smokeping.fcgi
--cache-dir=/var/smokeping/ --slave-name=rasberrypi
--shared-secret=/var/smokeping/secret.txt

I get the normal message that the probe has communicated with the server
and has received configuration. But no data is being graphed for this
probe so I took a look at the log.

This is what it says:
/var/log # cat syslog | grep smokeping

Feb 21 12:12:04 raspberrypi smokeping[2300]: Starting syslog logging

Feb 21 12:12:04 raspberrypi smokeping[2304]: Smokeping version 2.006008
successfully launched.

Feb 21 12:12:04 raspberrypi smokeping[2304]: Entering multiprocess mode.

Feb 21 12:12:04 raspberrypi smokeping[2304]: No targets defined for
probe TelnetIOSPing, skipping.

Feb 21 12:12:04 raspberrypi smokeping[2304]: No targets defined for
probe CiscoRTTMonEchoICMP, skipping.

Feb 21 12:12:04 raspberrypi smokeping[2304]: No targets defined for
probe EchoPingHttp, skipping.

Feb 21 12:12:04 raspberrypi smokeping[2304]: Child process 2305 started
for probe FPing.

Feb 21 12:12:04 raspberrypi smokeping[2304]: All probe processes started
successfully.

Feb 21 12:12:04 raspberrypi smokeping[2305]: FPing: probing 2 targets
with step 300 s and offset 258 s.

Feb 21 12:14:18 raspberrypi smokeping[2305]: open3: exec of
/usr/sbin/fping -C 20 -q -B1 -r1 -i10 <myfirsttarget>  <mysecondtarget>
failed at /opt/smokeping/bin/../lib/Smokeping/probes/FPing.pm line 143

Feb 21 12:14:18 raspberrypi smokeping[2304]: Child process 2305 (probe
FPing) exited unexpectedly with status 256.

This is the same exactly as when I run it with the packaged version.

After that I took a look at line 143:
my $pid = open3($inh,$outh,$errh, @cmd); 

I tried the debug option which showed the same thing as the log and
after that I tried issuing that command myself: /usr/sbin/fping -C 20 -q
-B1 -r1 -i10 <myfirsttarget>. 

That gave me the message that there was no fping command at /usr/sbin. I
found out it was at /usr/bin directory. So I created a symbolic link to
overcome this problem.

I believe the slave takes the path for the probe from the master. Is
there any way I can change that on the probe? Without using that
symbolic link?

 

Using the Rasberrypi as a probe could prove to be very advantageous as
it has very low power consumption and can be easily shipped and
installed at remote locations (where you would need a probe).

Greetings to all,

 

-----------------------------------------------------

Ioannis Theodoridis

Network & Systems Engineer

-----------------------------------------------------

 

 

 

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