[smokeping-users] Automatically download fresh .png snapshot.

[Daniel Crandall]

Hi,

I need to automatically download .png of 7 day snapshots of certain smokeping 
graphs to send to a group of concerned parties.  I’ve tried two techniques 
without success:

1)  Download the png using wget

I learned about setting the displaymode=a and adjusting the start and end URL 
chunks to get a URL like this:
https://smokeping.oursite.com/smokeping/smokeping.cgi?displaymode=a;start=now-7day;end=now;target=OurServers.HTTPSLatency.prd

This URL gives me a single graph with the snapshot interval I need.  But I 
can’t figure out how to download the actual graph png.  It’s weird because if I 
put the URL in a browser, right click on the graph and save it manually, it 
saves a file called smokeping.png that is the correct graph.  But when I try to 
do the same using wget like this:
 `wget -nd -r -l 5 -A png 
https://smokeping.oursite.com/smokeping/smokeping.cgi?displaymode=a;start=now-7day;end=now;target=OurServers.HTTPSLatency.prd`

It downloads smokeping.png – but instead of it being a graph, this version is 
simply the smokeping logo.  It also downloads the RRD logo, but no other png 
files.

2) Using rrdtool on the rrd files themselves to generate a png of the snapshot 
I’m looking for on my smokeping server, and then copying it to the web server 
dir where I can then download it using wget.
Unfortunately I haven’t been able to figure out the correct rrd parameters and 
DEF, CDEF, AREA..etc. settings to actually generate a smokeping graph.

If anyone can point me in the right direction with either of the above methods 
– or share another technique to achieve the same goal, I would be very grateful.

Thanks!

— Daniel Crandall
Savant - DevOps



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