Use "Mininet-dashboard" to detect my established network

[Lin Ciou]

I will use Mininet-dashboard to detect my mininet topology.

Reference about this web

http://blog.sflow.com/2016/05/mininet-dashboard.html

And I open my topology is use "sudo python topology.py".

topology.py is use "MiniEdit" create. 

About topology links

h1-eth0<->s1-eth1 (OK OK)

s1-eth2<->s2-eth1 (OK OK)

s1-eth3<->s3-eth1 (OK OK)

s1-eth4<->s4-eth1 (OK OK)

s2-eth2<->s5-eth1 (OK OK)

s3-eth2<->s5-eth2 (OK OK)

s4-eth2<->s5-eth3 (OK OK)

s5-eth4<->h2-eth0 (OK OK)

And I use this command to connect sflow.

ovs-vsctl -- --id=@sflow create sflow agent=lo target=127.0.0.1 sampling=10 polling=10 -- -- set bridge s1 sflow=@sflow -- set bridge s2 sflow=@sflow -- set bridge s3 sflow=@sflow -- set bridge s4 sflow=@sflow -- set bridge s5 sflow=@sflow

But,I watch sflow-rt web,it have no topology information.

Please help me how to use Mininet-dashboard to detect my established network.

Thanks you.

[Peter Phaal]

You need to use the --custom extras/sflow.py argument when you start Mininet. The sflow.py script automatically configures sFlow on all the bridges and posts the topology to sFlow-RT (you need to start sFlow-RT before you start Mininet).

http://blog.sflow.com/2016/05/mininet-flow-analytics.html  

[Lin Ciou]

I know that.

But I want to ask have any method can using the sflow.py with I create topolopy??

Peter Phaal於 2018年3月29日星期四 UTC+8下午10時01分46秒寫道：

[Peter Phaal]

On Thursday, March 29, 2018 at 8:46:24 PM UTC-7, Lin Ciou wrote:

But I want to ask have any method can using the sflow.py with I create topolopy??

You have two choices:

1. Copy methods from sflow.py into your Python program that creates the custom topology and starts Mininet. You mentioned using MiniEdit. You can export the program using File>Export Level 2 Script to create the Python program. 

2. A cleaner way is to build your custom topology as a custom topology module, http://mininet.org/walkthrough/#custom-topologies. You can then combine the custom topology with sflow.py on the Mininet command line, e.g.

sudo mn --custom ~/mininet/custom/topo-2sw-2host.py,sflow-rt/extras/sflow.py --topo mytopo

[Lin Ciou]

Thanks for your answer first!

I will try it to my experiment.

If any question I will post in this!!!

When time comes, please help answer again!!!

Thanks you~~~

Peter Phaal於 2018年3月30日星期五 UTC+8下午12時46分18秒寫道：

[Lin Ciou]

Hello Peter

This day I try to use sflow with I create topology.

Then mininet show massage. (Like attachment)

How should I do?

I also saw the mininet-weathermap website.

But I can't to success, Can you help me?

Thanks you~

Peter Phaal於 2018年3月30日星期五 UTC+8下午12時46分18秒寫道：

On Thursday, March 29, 2018 at 8:46:24 PM UTC-7, Lin Ciou wrote:

But I want to ask have any method can using the sflow.py with I create topolopy??

You have two choices:

1. Copy methods from sflow.py into your Python program that creates the custom topology and starts Mininet. You mentioned using MiniEdit. You can export the program using File>E0xport Level 2 Script to create the Python program. 

[Peter Phaal]

On Tuesday, April 3, 2018 at 1:31:32 AM UTC-7, Lin Ciou wrote:

Hello Peter

This day I try to use sflow with I create topology.

Then mininet show massage. (Like attachment)

How should I do?

I also saw the mininet-weathermap website.

But I can't to success, Can you help me?

What version of Mininet are you using? 

sudo mn --version

The ability to have multiple, comma separated, entries in the --custom field is fairly new. From the error messages you are getting, it looks like the --custom field is not being treated as a list of files, but as a single file, indicating an older Mininet version.

I built version 2.2.2 from sources using the following instructions:

http://mininet.org/download/#option-2-native-installation-from-source

[Lin Ciou]

Oh, No...

My version is

ubuntu@sdnhubvm:~$ mn --version

2.1.0+

so,this version can't use this method???

Peter Phaal於 2018年4月3日星期二 UTC+8下午9時54分05秒寫道：

[Lin Ciou]

Sorry,i mean if I must use 2.1.0 version.

Have any method can do this thing?

Peter Phaal於 2018年4月3日星期二 UTC+8下午9時54分05秒寫道：

[Peter Phaal]

On Thursday, April 5, 2018 at 5:30:35 AM UTC-7, Lin Ciou wrote:

Sorry,i mean if I must use 2.1.0 version.

Have any method can do this thing?

You can load the sflow.py as a library in your custom Mininet Python script:

import sys

sys.path.insert(0,'sflow-rt/extras')

import sflow

Now when your script starts the network, 

net.start()

the switches will be configured to export sFlow and the topology will be exported.

[Lin Ciou]

Thank you very much

I can use examples to test success

Thank you very much for your help

I will use the example to change my topology

Let me make the next study

Thank you

Peter Phaal於 2018年4月5日星期四 UTC+8下午10時35分09秒寫道：

[Sakshini Hangloo]

did the same as mentioned in the link u provided, but got an exception>> import error
also i downloaded the mininet dashboard from  https://blog.sflow.com/2016/05/mininet-dashboard.html , but the dashboard is also not opening

plz help

[Sakshini Hangloo]

did the same as mentioned in the link provided by you, but still getting the exception...
i also downloaded mininet dashboard, but the interface if also not opening. i did the same as mentioned in https://blog.sflow.com/2016/05/mininet-dashboard.html

plz help

On Thursday, March 29, 2018 at 7:31:46 PM UTC+5:30, Peter Phaal wrote:

[Peter Phaal]

You need to install the Python requests module:

pip install requests

[Lin Ciou]

Hello Peter,

I have a new question~

About mininet custom topology,

I want set link "bw" and "delay" and "loss".

How should I key in topology python file?

Like this sample.

http://mininet.org/walkthrough/#custom-topologies

Peter Phaal於 2018年4月27日星期五 UTC+8下午9時08分03秒寫道：

[Peter Phaal]

I usually set the link parameters using the Mininet command line:

sudo mn --custom ~/mininet/custom/topo-2sw-2host.py --topo mytopo --link tc,bw=10,delay=2ms,loss=1

You can use the parameters defined in the mininet.link.TCIntf Class:

http://mininet.org/api/classmininet_1_1link_1_1TCIntf.html

Using command line parameters keeps topology code simple and makes it easier to re-use. 

If you need to specify different values for links within the topology then you need to modify your python script, e.g:

linkopts = dict(bw=10, delay='2ms', loss=1)

topo.addLink(leftSwitch, rightSwitch, **linkopts)

[Jakob Wångö]

Hi Peter again :) 

After updating the sFlow.py file to detect the newer inteface names, it works perfectly for me. 
But i have a small followup question. 
sFlow agents are active for me and i can see metrics and statistics. Buit when trying to test the mininet-dashboard app, the graphs that are in there are absolutely empty. Not even the graphs are shown, like something that is require to make it work is missing.
See screenshot: http://puu.sh/An7Ec/5a1d5c81c0.png

Would you happen to know why this could be the case ? 
The VM is completly installed from scratch, where sflow, mininet, controller software, java, node and so on is all manually installed.

[Peter Phaal]

There was an issue with Java 9+. Download the latest version of sFlow-RT - it should fix the problem.

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[Lin Ciou]

Hello Peter,

Very thanks you for help so much.

This question according to the practice is be solved!!!

I was so busy, so just have time to test these days.

Sorry for reply later~~~

And very thank you so much~

Peter Phaal於 2018年5月15日星期二 UTC+8下午10時36分35秒寫道：

[hamid asadi]

hello man
i have a question like you!
i created a fat-tree topology in miniedit and export it as a python code. now i want to monitor my topo but can't merge my script and sflow.py.
how should i solve this?

thanks for your cooperation.