Terraform应用配置时lists参数元素类型错误问题咨询

1. 变量类型和取值逻辑不匹配：你定义的node_hosts是两层嵌套map（map(map(object(...)))），但你在locals中遍历var.node_hosts时，直接取出的v是第二层的整组节点集合（也就是key为default对应的全部节点map），并非单个节点对象。
2. local.all_nodes取值逻辑错误：values(var.node_hosts)[*].name是从第一层map的value（整组节点集合）中提取不存在的name属性，返回的元素类型不是字符串，触发了join函数的类型校验报错。
   你删除类型定义后Terraform会做隐式类型兼容，所以可以运行，但开启强类型校验后就会抛出错误。

方案1：保留原有两层map结构，修正locals遍历逻辑 #

先拍平两层map取出所有节点对象，再做后续处理，替换你的locals块为以下内容：

locals {
   # 拍平两层map，提取所有节点对象
   flat_nodes = flatten([
     for group in values(var.node_hosts) : [
       for node_key, node in group : node
     ]
   ])

   all_nodes_verbose_etcd = [for node in local.flat_nodes:
                               format("%s ip=%s etcd_instance=%s", node.name, node.ipv4_address, node.etcd_instance)
                               if length(node.etcd_instance) > 0]

   all_nodes_verbose      = [for node in local.flat_nodes:
                               format("%s ip=%s", node.name, node.ipv4_address)
                               if length(node.etcd_instance) == 0]

   master_nodes           = [for node in local.flat_nodes:
                               node.name
                               if node.compute_node != true]

   etcd_nodes             = [for node in local.flat_nodes:
                               node.name
                               if length(node.etcd_instance) > 0]

   all_nodes              = [for node in local.flat_nodes : node.name]

   kubernetes_conf_file = format("%s/kubespray/inventory/%s/group_vars/k8s-cluster/k8s-cluster.yml", pathexpand("~"), var.kubespray_inventory)
   kubespray_inv_file   = format("%s/kubespray/inventory/%s/inventory.ini", pathexpand("~"), var.kubespray_inventory)
   context_artifact     = format("%s/kubespray/inventory/%s/artifacts/admin.conf", pathexpand("~"), var.kubespray_inventory)
}

方案2：简化变量结构（推荐，无分组需求时使用） #

如果你没有节点分组需求，只是用default做了一层无意义的嵌套，可以直接把变量改为单层map结构：

1. 修改变量定义：

variable "node_hosts" {
  type = map(object({
      name          = string
      compute_node  = bool
      etcd_instance = string
      ipv4_address  = string
    }))
}

2. 对应修改tfvars配置，去掉外层的default嵌套：

node_hosts = {
  z-ca-arc-control1 = {
    name          = "z-ca-arc-control1"
    compute_node  = false
    etcd_instance = "etcd1"
    ipv4_address  = "10.123.456.01"
  },
  z-ca-arc-control2 =  {
    name          = "z-ca-arc-control2"
    compute_node  = false
    etcd_instance = "etcd2"
    ipv4_address  = "10.123.456.02"
  },
  z-ca-arc-compute1 = {
    name          = "z-ca-arc-compute1"
    compute_node  = true
    etcd_instance = "etcd3"
    ipv4_address  = "10.123.456.03"
  },
  z-ca-arc-compute2 = {
    name          = "z-ca-arc-compute2"
    compute_node   = true
    etcd_instance = ""
    ipv4_address  = "10.123.456.04"
  },
  z-ca-arc-compute3 = {
    name          = "z-ca-arc-compute3"
    compute_node  = true
    etcd_instance = ""
    ipv4_address  = "10.123.456.05"
  }
}

内容的提问来源于stack exchange，提问作者ChrisAdkin