Terraform-provider-google: Inappropriate value for attribute "ip_allocation_policy"

[ademariag]

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Terraform Version

Terraform v0.12.8
+ provider.google v2.14.0
+ provider.google-beta v2.14.0
+ provider.random v2.2.0
+ provider.template v2.1.2

Affected Resource(s)

• google_container_cluster

Terraform Configuration Files

{
  "resource": {
    "google_container_cluster": {
      "sw01": {
        "addons_config": {
          "istio_config": {
            "auth": "AUTH_MUTUAL_TLS",
            "disabled": false
          }   
        },  
        "depends_on": [
          "google_project_service.enable_container_service"
        ],  
        "initial_node_count": 1,
        "ip_allocation_policy": [
          {   
            "use_ip_aliases": true,
            "create_subnetwork": true
          }]  
        ,   
        "location": "europe-west1",
        "master_auth": {
          "client_certificate_config": {
            "issue_client_certificate": false
          },  
          "password": "", 
          "username": ""
        },  
        "min_master_version": "1.13.7-gke.24",
        "name": "sw01",
        "network": "${google_compute_network.sw01.self_link}",
        "provider": "google",
        "remove_default_node_pool": true
      }   
    },
  }
} 

Debug Output

Panic Output

Expected Behavior

Create cluster it alias_ip

Actual Behavior

Error: Incorrect attribute value type

  on kubernetes.tf.json line 15, in resource.google_container_cluster.sw01:
  15:         "ip_allocation_policy": [

Inappropriate value for attribute "ip_allocation_policy": element 0:
attributes "cluster_ipv4_cidr_block", "cluster_secondary_range_name",
"node_ipv4_cidr_block", "services_ipv4_cidr_block",
"services_secondary_range_name", and "subnetwork_name" are required.

Steps to Reproduce

1. terraform apply

Important Factoids

I am using json instead of hcl

[ademariag]

Please note I have tried with several different combinations of ip_allocation_policy, all leading to similar errors

[danawillow]

Hi @ademariag! ip_allocation_policy is an unusual field in the provider, because it has a special property that we had to set to enable certain features to work with 0.12. This has the side effect that, when using JSON, you have to set all the fields for this block, even optional ones.

https://www.terraform.io/docs/configuration/attr-as-blocks.html has some more details, but the relevant quotes are:

The interpretation of these values in JSON syntax is, therefore, equivalent to that described under Arbitrary Expressions with Argument Syntax above, but expressed in JSON syntax instead.

and

Because of the rule that argument declarations like this fully override any default value, when creating a list-of-objects expression directly the usual handling of optional arguments does not apply, so all of the arguments must be assigned a value, even if it's an explicit null

tl;dr: I'd recommend modifying your config to look like this:

        "ip_allocation_policy": [
          {
            "cluster_ipv4_cidr_block": null,
            "cluster_secondary_range_name": null,
            "node_ipv4_cidr_block": null,
            "services_ipv4_cidr_block":  null,
            "services_secondary_range_name": null,
            "subnetwork_name": null,
            "use_ip_aliases": true,
            "create_subnetwork": true
          }]  
        , 

I'm going to go ahead and close this issue out, but if it doesn't work or anything else comes up, we can reopen it.

[ademariag]

FYI @danawillow that worked, thank you.

[hashibot[bot]]

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