Error: Invalid type specification on .terraform/modules/aks/variables.tf line 67, in variable "agents_pool_linux_os_configs":

[sfozz]

Is there an existing issue for this?

• I have searched the existing issues

Greenfield/Brownfield provisioning

greenfield

Terraform Version

1.2.9

Module Version

6.7.0

AzureRM Provider Version

3.49.0

Affected Resource(s)/Data Source(s)

na

Terraform Configuration Files

Using the example from examples/startup/main.tf

tfvars variables values

defaults

Debug Output/Panic Output

~/bin/terraform_1.2.9 init
Initializing modules...
There are some problems with the configuration, described below.

The Terraform configuration must be valid before initialization so that
Terraform can determine which modules and providers need to be installed.
╷
│ Error: Invalid type specification
│
│   on .terraform/modules/aks/variables.tf line 67, in variable "agents_pool_linux_os_configs":
│   67:     sysctl_configs = optional(list(object({
│   68:       fs_aio_max_nr                      = optional(number)
│   69:       fs_file_max                        = optional(number)
│   70:       fs_inotify_max_user_watches        = optional(number)
│   71:       fs_nr_open                         = optional(number)
│   72:       kernel_threads_max                 = optional(number)
│   73:       net_core_netdev_max_backlog        = optional(number)
│   74:       net_core_optmem_max                = optional(number)
│   75:       net_core_rmem_default              = optional(number)
│   76:       net_core_rmem_max                  = optional(number)
│   77:       net_core_somaxconn                 = optional(number)
│   78:       net_core_wmem_default              = optional(number)
│   79:       net_core_wmem_max                  = optional(number)
│   80:       net_ipv4_ip_local_port_range_min   = optional(number)
│   81:       net_ipv4_ip_local_port_range_max   = optional(number)
│   82:       net_ipv4_neigh_default_gc_thresh1  = optional(number)
│   83:       net_ipv4_neigh_default_gc_thresh2  = optional(number)
│   84:       net_ipv4_neigh_default_gc_thresh3  = optional(number)
│   85:       net_ipv4_tcp_fin_timeout           = optional(number)
│   86:       net_ipv4_tcp_keepalive_intvl       = optional(number)
│   87:       net_ipv4_tcp_keepalive_probes      = optional(number)
│   88:       net_ipv4_tcp_keepalive_time        = optional(number)
│   89:       net_ipv4_tcp_max_syn_backlog       = optional(number)
│   90:       net_ipv4_tcp_max_tw_buckets        = optional(number)
│   91:       net_ipv4_tcp_tw_reuse              = optional(bool)
│   92:       net_netfilter_nf_conntrack_buckets = optional(number)
│   93:       net_netfilter_nf_conntrack_max     = optional(number)
│   94:       vm_max_map_count                   = optional(number)
│   95:       vm_swappiness                      = optional(number)
│   96:       vm_vfs_cache_pressure              = optional(number)
│   97:     })), [])
│
│ Optional attribute modifier expects only one argument: the attribute type.
╵

Expected Behaviour

terraform should initialise

Actual Behaviour

error

Steps to Reproduce

1. terraform init

Important Factoids

No response

References

No response

[lonegunmanb]

Hi @sfozz thanks for reporting this issue, a short answer is, optional object field was introduced by Terraform 1.3. The current required version of Terraform is obsolete. I'll open a pr to fix this issue, meanwhile you can upgrade your Terraform version to >= 1.3 as a workaround.