I downloaded the nox from git repository. Both in
"git://noxrepo.org/nox" and "git://noxrepo.org/noxcore" there is the
same file "monitor.py" in "src/scripts/" directory.
Thank Reid for helping! And I'll try webservice, too.
Wen-Pei
Reid Price wrote:
PS: Looks like something took a few liberties with spacing when I
copied the example function. You should obviously ignore the indent
after the one-line if.
-Reid
On Jul 3, 2010, at 0:59, Reid Price <r...@nicira.com
<mailto:r...@nicira.com>> wrote:
Hi Wen-Pei,
I haven't seen this in a while, it is certainly somewhat legacy.
What version of nox are you using? This was intended to create a
quick-and-dirty monitor page for the number of flows, but you should
be able to modify to whatever purpose you want - I found webservice
calls to be easily adaptable. Looking at it now, the main
abstractions this script is missing is one or two functions:
something to get a dictionary mapping data source names to int/float
values (for harvest) and perhaps an additional one to get the names
as a list (for extrapolate_sources). It is somewhat clumsily
combined into a single reap function and two blocks of code to parse
that output.
The oldest version of that script I could find was customized for a
specific format of dpctl dump-tables, where the data looked like:
id: 2 name: linear n_flows: 12 max_flows: 100
table 0: name hash2 , max 131072, active 14, matched 0
table 1: name linear , max 100, active 0, matched 0
This has changed dramatically, as you mentioned. Using Open
vSwitch's version of this command (ovs-ofctl dump-tables) shows me
something like this:
Jul 03 00:04:06|00001|ofctl|INFO|connecting to unix:<bridge>
stats_reply (xid=0xe103ac66): flags=none type=3(table)
2 tables
0: hash : wild=0x00000, max=1048576, active=0
lookup=43921298, matched=43773778
1: classifier: wild=0x3fffff, max= 65536, active=10
lookup=0, matched=0
In practice, replacing the middle section of the harvest function
with anything that would parse that into "info = {'hash': 0,
'classifier': 10}" would be sufficient. A regex is probably the
classiest way, but something ugly is a little quicker to see if the
rest is working - for example, this would likely suffice for the above:
for line in table:
if 'active' not in line: continue
name = line.split(':')[1].strip()
active = int(line.split('=')[-1])
info[name] = active
You would also have to make a modification to the extrapolate_sources
function such that the end result was "sources = ['hash',
'classifier']" (in this case) - a simpler version of the parsing
above (appending the name to a list) would do the trick.
-Reid
On Fri, Jul 2, 2010 at 11:39 PM, Wen-Pei
<wen...@networklab.csie.ncu.edu.tw
<mailto:wen...@networklab.csie.ncu.edu.tw>> wrote:
> Hi, all:
>
> I found monitor.py in nox/src/scripts/ (not in
src/noxcoreapps/examples/
> ) . And I guessed that it can generate a rrd graph. But it can't work
> with many problems. It seems that there are many modifications in the
> output of "dpctl dump-tables nl:0" that cause this script didn't work
> correctly. Is this script just a legacy? How to fix it and generate
some
> graph? Or is there any script or tool have the same function and could
> replace this script?
>
> I tried to fix bugs but failed bucuse of unfamiliar with rrdtool...
>
> Thanks for replying.
>
> Wen-Pei
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