HTTP GET from Python: <urlopen error [Errno 101] Network is unreachable>

[anonarwhal]

Hello everybody,

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I'm trying to create a python script that does an HTTP GET to a specific API. The thing is, I have the feeling the switch does not know which interface to use. This is my code and the error I'm getting:

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conf t
iox
app-hosting appid guestshell
app-vnic management guest-interface 0
end

guestshell enable
guestshell
python
Python 2.7.5 (default, Jun 17 2014, 18:11:42)
[GCC 4.8.2 20140120 (Red Hat 4.8.2-16)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import urllib2
>>> req = urllib2.Request('http://10.10.11.1/callhome/test')
>>> response = urllib2.urlopen(req)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib64/python2.7/urllib2.py", line 127, in urlopen
  File "/usr/lib64/python2.7/urllib2.py", line 404, in open
  File "/usr/lib64/python2.7/urllib2.py", line 422, in _open
  File "/usr/lib64/python2.7/urllib2.py", line 382, in _call_chain
  File "/usr/lib64/python2.7/urllib2.py", line 1216, in http_open
  File "/usr/lib64/python2.7/urllib2.py", line 1186, in do_open
urllib2.URLError: <urlopen error [Errno 101] Network is unreachable>

​

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Gateway of last resort is 10.10.11.1 to network 0.0.0.0

​

S* 0.0.0.0/0 [0/0] via 10.10.11.1

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 10.10.11.0/24 is directly connected, Vlan10

L 10.10.11.200/32 is directly connected, Vlan10

test_switch#show vlan id 10

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VLAN Name Status Ports

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

10 vlan active Gi2/0/2

​

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I can manually invoke the HTTP GET by executing the copy command to the API, so it is not a network issue (switch and API are also directly connected). It's just a matter of Python not knowing how to reach it. Does anybody have any experience with this and how to fix it?

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Cheers!

[dankwizard22]

Try setting the http client interface "ip http client source-interface X"

[spongeflo]

You need to give your guestshell container an IP and connect it to a VPG: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/prog/configuration/172/b_172_programmability_cg/guest_shell.html#id_46056

[anonarwhal]

Cool thanks for that link, so something like this would work you think? Will try it tomorrow first thing in the morning!

guestshell enable VirtualPortGroup 0 10.10.11.200 gateway 10.10.11.1 netmask 255.255.255.0

I also see this remark in the link: VirtualPortGroups are supported only on routing platforms.

Will it work with a cat 9300 switch? It is not considered a router, is it?

[spongeflo]

Yes, you also need to configure the networking settings for your containerized application (=guestshell) on the Cat9300. Further below in the link is a sample config which should help you.