unrecognized arguments: --cluster-autoscaler-profile scan-interval=30s

Describe the bug

Command Name

az aks create

Errors:

az: error: unrecognized arguments: --cluster-autoscaler-profile scan-interval=30s

To Reproduce:

az aks create \
  --resource-group xyz \
  --name xyz \
  --node-vm-size Standard_F2s_v2 \
  --nodepool-name xyz \
  --node-count 1 \
  --enable-cluster-autoscaler \
  --min-count 1\
  --max-count 3 \
  --cluster-autoscaler-profile scan-interval=30s \
  --location westeurope \
  --enable-addons monitoring \
  --generate-ssh-keys \
  --service-principal xyz \
  --client-secret xyz

Will result in above mentioned error.

If I simply omit --cluster-autoscaler-profile scan-interval=30s cluster will be successfully created.

This option is suggested in documentation page: Set the cluster autoscaler profile when creating an AKS

az aks create \
  --resource-group myResourceGroup \
  --name myAKSCluster \
  --node-count 1 \
  --enable-cluster-autoscaler \
  --min-count 1 \
  --max-count 3 \
  --cluster-autoscaler-profile scan-interval=30s

Furthermore, if I try to add scan-itnerval option once the cluster was created as suggested in documentation: Set the cluster autoscaler profile on an existing AKS cluster

az aks update \
  --resource-group xyz \
  --name xyz \
  --cluster-autoscaler-profile scan-interval=30s

I’ll get the same error:

az: error: unrecognized arguments: --cluster-autoscaler-profile scan-interval=30s

Expected Behavior

I would expect scan-interval option which defines how often cluster is reevaluated for scale up or down to be enabled as suggested in official documentation.

Environment Summary

Linux-5.4.0-21-generic-x86_64-with-debian-bullseye-sid (Ubuntu 20.04)
Python 3.6.5
Installer: DEB

azure-cli 2.3.1

Additional Context

[AdnanHodzic]

@marwanad problem is that libffi6 is not available in 20.04 focal repos, last Ubuntu release it was in is 19.04 eoan.

However, out of sheer curiosity I downloaded libffi6 for 19.04 release, installed it and it worked.

$ sudo dpkg -i libffi6_3.2.1-9_amd64.deb 
Selecting previously unselected package libffi6:amd64.
(Reading database ... 290781 files and directories currently installed.)
Preparing to unpack libffi6_3.2.1-9_amd64.deb ...
Unpacking libffi6:amd64 (3.2.1-9) ...
Setting up libffi6:amd64 (3.2.1-9) ...
Processing triggers for libc-bin (2.31-0ubuntu7) ...
$ az extension add --name aks-preview
The installed extension 'aks-preview' is in preview.

After which I was able to add --cluster-autoscaler-profile scan-interval=30s option to my cluster.

I created a feature request in regards to packaging issue: https://github.com/Azure/azure-cli/issues/13081

Thank you for your assistance and please feel free to close this issue.

[palma21]

Closing, and using the linked issue to track.