No candidate nodes found error

[Nishanth Shyamkumar]

Hi,

I am trying to run my port-mirroring experiment, and on some sites I get the following error:

Slice Exception: Slice Name: Traffic Listening Demo GATECH, Slice ID: 84b0bc73-8fe7-4e32-962f-2c8fccc47b76: Slice Exception: Slice Name: Traffic Listening Demo GATECH, Slice ID: 84b0bc73-8fe7-4e32-962f-2c8fccc47b76: Node: GATECH_node0, Site: GATECH, State: Closed, Insufficient resources: No candidates nodes found to serve res: #3d425fc6-0f44-4e98-a0cc-d9ee9358cb8f slice: [Traffic Listening Demo GATECH(84b0bc73-8fe7-4e32-962f-2c8fccc47b76) Owner:<email_address>] state:[Nascent,Ticketing] #

Could someone explain what exactly is the error here? Which resource is failing to be allocated?

[Ilya Baldin]

“No candidates nodes found to serve” – there aren’t enough resources in the site to serve your request. It could be there are not enough cores or RAM in the workers because the site is too busy.

[Komal Thareja]

Hi Nishant,

VM requested on GATECH identified by ID: 3d425fc6-0f44-4e98-a0cc-d9ee9358cb8f cannot be allocated. Looks like you are requesting CX6 there which are only available on GATECH-w3 which is currently under maintenance. Hence, CF is unable to find any nodes to serve this reservation.

Hope this helps!

Thanks,

Komal

[Nishanth Shyamkumar]

Thanks for the info. Is there some way to get the maintenance status of a site through some API , or must the user just keep track of it through forum updates?

[Komal Thareja]

Hi Nishanth,

We just added support for users to query host level information as well. Examples for this would be available in a couple of days. I am sharing a snippet below on how this can be done:


fablib.list_hosts()
resources = fablib.get_resources()
site = resources.get_site("MAX")
all_hosts = site.get_hosts()
host = site.get_host(name="max-w1.fabric-testbed.net")
print(host)

Please checkout our documentation here to find more details. Please let us know if you have more questions/concerns.

https://fabric-fablib.readthedocs.io/en/latest/resources.html

https://fabric-fablib.readthedocs.io/en/latest/site.html

Thanks,

Komal

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