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Unclear error when specifying "az aks nodepool add" with --node-count 0

See original GitHub issue

Describe the bug Azure CLI does not provide a clear error when setting “–node-count 0” To Reproduce

Create a normal AKS cluster

az group create -n tmf-clus-auto -l southcentralus
az aks create -g tmf-clus-auto -n tmf-clus-auto --node-count 2

Add a Nodepool with 0 nodes:

az aks nodepool add -g tmf-clus-auto --cluster-name tmf-clus-auto --name gpunodepool --node-count 0 --node-vm-size Standard_NC6
usage: az aks nodepool add [-h] [--verbose] [--debug] [--output {json,jsonc,table,tsv,yaml,none}] [--query JMESPATH] [--subscription _SUBSCRIPTION]
                           --resource-group RESOURCE_GROUP_NAME --cluster-name CLUSTER_NAME --name NODEPOOL_NAME [--kubernetes-version KUBERNETES_VERSION]
                           [--zones {1,2,3} [{1,2,3} ...]] [--node-vm-size NODE_VM_SIZE] [--node-osdisk-size NODE_OSDISK_SIZE] [--node-count NODE_COUNT]
                           [--vnet-subnet-id VNET_SUBNET_ID] [--max-pods MAX_PODS] [--os-type OS_TYPE] [--min-count MIN_COUNT] [--max-count MAX_COUNT]
                           [--enable-cluster-autoscaler] [--node-taints NODE_TAINTS] [--no-wait]
az aks nodepool add: error: division by zero

Expected behavior It should either provide a useful error message (e.g. “Node Count must be a positive integer”), or proceed to create the AKS node pool with 0 nodes in it. There is nothing in the documentation which says it cannot be of node-count 0

Environment summary Running on OSX. Reproduced issue on Azure Shell

 …/tmp/spark  az --version
azure-cli                         2.0.80 *

command-modules-nspkg              2.0.3
core                              2.0.80 *
nspkg                              3.0.4
telemetry                          1.0.4

Extensions:
k8sconfiguration                   0.1.4
connectedk8s                       0.1.1
azure-cli-iot-ext                  0.7.1
aro                                0.1.0 (dev) /Users/thfalgou/git/Azure/ARO-RP/python/az/aro

Python location '/usr/local/Cellar/azure-cli/2.0.80/libexec/bin/python'
Extensions directory '/Users/thfalgou/.azure/cliextensions'
Development extension sources:
    /Users/thfalgou/git/Azure/ARO-RP/python

Python (Darwin) 3.8.1 (default, Dec 27 2019, 18:06:00)
[Clang 11.0.0 (clang-1100.0.33.16)]

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Additional context

Issue Analytics

State:
Created 3 years ago
Comments:5 (2 by maintainers)

Top GitHub Comments

2reactions

jlukcommented, Jun 1, 2020

Acknowledging this is an improvement on our backlog to fix to support size 0 user pools in CLI. This should be picked up soon. cc @marwanad @xizhamsft

0reactions

bpdohallcommented, May 30, 2020

@lastcoolnameleft - You are correct that there are no constraints applied to the node-count value being passed in via CLI.

@yungezz - specifying a node-count of 0 leads to an error when validating the value of max-pods. Looks like a validation with error message should be added to prevent node-count=0 here: https://github.com/Azure/azure-cli/blob/dev/src/azure-cli/azure/cli/command_modules/acs/_params.py#L157

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