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Maximilien_Rieh's avatar
Maximilien_Rieh
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Oct 22, 2014

iControl Rest API: Node description reliability problems

Hi,

We're orchestrating f5 loadbalancers through the iControl rest API and we seem to be running into strange behaviour.

A GET against 

/mgmt/tm/ltm/node/NODENAME
returns information about that node. The JSON usually looks like this (shortened):

{
 'kind': 'tm:ltm:node:nodestate',
 'name': '/partition_we_use/hostname',
 'state': 'down',
 'session': 'user-disabled',
 [...]
}

But sometimes the 

session
key is just missing. I couldn't find an API contract but it seems wrong to me to just randomly leave a field out of the response.

Any ideas what might be wrong? Colleagues have seen it show up occasionally, and I was not able to reproduce it yet (and it's only affecting some nodes).

APM
iControlREST
security

2 Replies

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  • Mattias_Anderss's avatar
    Mattias_Anderss
    Icon for Nimbostratus rankNimbostratus
    Apr 28, 2015

    Hi,

     

    I've tried to reproduce this but haven't seen the session key missing. What version are you on? You might try to add "_return_fields" to the GET request to fields you wish to retrive? That might do the trick?

     

    • Mattias_Anderss's avatar
      Mattias_Anderss
      Icon for Nimbostratus rankNimbostratus
      Apr 28, 2015
      Sorry, not "_return_fields" but "$select". For example: /mgmt/tm/ltm/node?ver=11.5.0&$select=session,name { "kind": "tm:ltm:node:nodecollectionstate", "selfLink": "https://localhost/mgmt/tm/ltm/node?$select=session%2Cname&expandSubcollections=true&ver=11.5.0", "items": [ { "name": "node1", "session": "monitor-enabled" }]}