Terraform：等待 dynamodb 表状态为“Active”

Question

我有一些 terraform 代码，可以创建 dynamodb 表并将一项插入到该表中。当我运行

terraform apply

时，出现以下错误。看起来它将在 dynamodb 表完全创建之前插入该项目（状态 - 活动）。

module "dynamodb_table" {
  source   = "terraform-aws-modules/dynamodb-table/aws"
  name     = "${var.aws.region}-${var.config.dynamodb.table_name}"
  hash_key = var.config.dynamodb.hash_key
  attributes = [
    {
      name = var.config.dynamodb.hash_key
      type = "S"
    }
  ]
  billing_mode = "PAY_PER_REQUEST"
  table_class  = "STANDARD"
}

resource "random_string" "random" {
  length  = 16
  special = false
}

resource "aws_dynamodb_table_item" "table_item" {
  table_name = "${var.aws.region}-${var.config.dynamodb.table_name}"
  hash_key   = var.config.dynamodb.hash_key
  item = <<ITEM
  {
    "${var.config.dynamodb.hash_key}": {"S": "${random_string.random.result}"},
    "collections": {"M": {}}
  }
  ITEM
}

错误信息：

Error: creating DynamoDB Table Item: ResourceNotFoundException: Requested resource not found

Answer 1

要等待表存在，使用 Terraform

depends_on

应该就足够了：

module "dynamodb_table" {
  source   = "terraform-aws-modules/dynamodb-table/aws"
  name     = "${var.aws.region}-${var.config.dynamodb.table_name}"
  hash_key = var.config.dynamodb.hash_key
  attributes = [
    {
      name = var.config.dynamodb.hash_key
      type = "S"
    }
  ]
  billing_mode = "PAY_PER_REQUEST"
  table_class  = "STANDARD"
}

resource "random_string" "random" {
  length  = 16
  special = false
}

resource "aws_dynamodb_table_item" "table_item" {
  table_name = "${var.aws.region}-${var.config.dynamodb.table_name}"
  depends_on = "dynamodb_table"
  hash_key   = var.config.dynamodb.hash_key
  item = <<ITEM
  {
    "${var.config.dynamodb.hash_key}": {"S": "${random_string.random.result}"},
    "collections": {"M": {}}
  }
  ITEM
}

Answer 2

Terraform 可能会首先尝试在表中创建项目（由于并行性），因为表和项目之间不存在隐式依赖关系。隐式依赖关系是通过引用资源的属性或模块的输出来创建的。该模块不提供有用的输出。在这种情况下，您可以尝试使用

depends_on

元参数，以便告诉 terraform 在尝试创建项目之前创建表。例如，您将执行以下操作：

module "dynamodb_table" {
  source   = "terraform-aws-modules/dynamodb-table/aws"
  name     = "${var.aws.region}-${var.config.dynamodb.table_name}"
  hash_key = var.config.dynamodb.hash_key
  attributes = [
    {
      name = var.config.dynamodb.hash_key
      type = "S"
    }
  ]
  billing_mode = "PAY_PER_REQUEST"
  table_class  = "STANDARD"
}

resource "random_string" "random" {
  length  = 16
  special = false
}

resource "aws_dynamodb_table_item" "table_item" {
  depends_on = [module.dynamodb_table]
  table_name = "${var.aws.region}-${var.config.dynamodb.table_name}"
  hash_key   = var.config.dynamodb.hash_key
  item = <<ITEM
  {
    "${var.config.dynamodb.hash_key}": {"S": "${random_string.random.result}"},
    "collections": {"M": {}}
  }
  ITEM
}