patch empty zone list return from command.

[rajsinghtech]

Due to the az command being ran here, an empty set of data retruns as an empty string "" instead of [].

│ Error: Error in function call
│ 
│   on .terraform/modules/aks/main.tf line 37, in module "main":
│   37:   agents_availability_zones         = sort(flatten(jsondecode(module.availability_zones_data_source.stdout)))
│     ├────────────────
│     │ while calling jsondecode(str)
│     │ module.availability_zones_data_source.stdout is ""
│ 
│ Call to function "jsondecode" failed: EOF.

[PhilipSchmid]

Have you tried manually running the az command from here? I don't see how this should return "". I get the following for example:

$ az vm list-skus --location westeurope --zone --resource-type virtualMachines --size Standard_D2s_v3 --query '[].locationInfo[0].zones' --output jsonc
[
  [
    "3",
    "2",
    "1"
  ]
]

How does your var.instance_type and var.region look like? What did you configure?

[rajsinghtech]

Hmmm, looks like im setting region useast and setting Standard_D2s_v3 for var.worker_instance_type per template repo. Not setting var.instance_type specifically.

[PhilipSchmid]

By not setting var.instance_type, it should take its default value, Standard_D2s_v3.

[PhilipSchmid]

The template repo maps var.worker_instance_type to instance_type. Hence, you're setting it.

See https://github.com/isovalent/cute-template-repo/blob/099c1bc874f912b71076acee219922b3603a059f/azure-aks-byocni/aks.tf#L11C3-L11C49

[PhilipSchmid]

It seems like there are no Standard_D2s_v3 VMs available in useast:

az vm list-skus --location useast --zone --resource-type virtualMachines --size Standard_D2s_v3 --query '[].locationInfo[0].zones' --output jsonc
[]

Still, STDOUT shows a proper [] and no "" 🤔. Maybe matti/resource/shell sees [] as an "empty string"? 🤷
Anyhow, I just also saw https://github.com/matti/terraform-shell-resource shouldn't be used anymore. Perhaps we should anyway rework this module part.

[rajsinghtech]

 az vm list-skus --location useast --zone --resource-type virtualMachines --size Standard_D2s_v3 --query '[].locationInfo[0].zones' --output jsonc   

JSON is invalid: Unterminated string starting at: line 1 column 44885501 (char 44885500)

[rajsinghtech]

My az cli must be broken locally?