Using chunklist in TF11

main.tf

variable "ips" {
  default = [
    "1.1.1.1/32",
    "2.2.2.2/32",
    "3.3.3.3/32",
    "4.4.4.4/32",
    "5.5.5.5/32",
    "6.6.6.6/32",
    "7.7.7.7/32",
    "8.8.8.8/29",
    "9.9.9.9/32"
  ]
}

locals {
  chunks  = "${chunklist(var.ips, 5)}"
  rules = [
    { action = "allow", priority = "0", match = { versioned_expr = "SRC_IPS_V1", config = { src_ip_ranges = ["${local.chunks[0]}"] }}},
    { action = "deny(403)", priority = "2147483647", match = { versioned_expr = "SRC_IPS_V1", config = { src_ip_ranges = ["*"] }}, description = "Default rule: deny all"}
  ]
}

output "rules" {
  value = "${local.rules}"
}

output

$ terraform apply

Apply complete! Resources: 0 added, 0 changed, 0 destroyed.

Outputs:

foo = [
  {
    "action" = "allow"
    "match" = {
      "config" = {
        "src_ip_ranges" = [
          [
            "1.1.1.1/32",
            "2.2.2.2/32",
            "3.3.3.3/32",
            "4.4.4.4/32",
            "5.5.5.5/32",
          ],
        ]
      }
      "versioned_expr" = "SRC_IPS_V1"
    }
    "priority" = "0"
  },
  {
    "action" = "deny(403)"
    "description" = "Default rule: deny all"
    "match" = {
      "config" = {
        "src_ip_ranges" = [
          "*",
        ]
      }
      "versioned_expr" = "SRC_IPS_V1"
    }
    "priority" = "2147483647"
  },
]