Terraform 创建 Lambda 函数时出错 : ResourceConflictException with the resource just created by Terraform apply

Question

我正在我们账户的每个 AWS 区域中部署一个 Lambda 函数，但遇到了一些奇怪的问题，即应用失败并为某些 AWS 区域显示以下错误消息
应用 Terraform 时出错

Error: Error creating Lambda function: ResourceConflictException: Function already exist: log-forwarder
{
  RespMetadata: {
    StatusCode: 409,
    RequestID: "8cfd7260-7c4a-42d2-98c6-6619c7b2804f"
  },
  Message_: "Function already exist: log-forwarder",
  Type: "User"
}

上述 Lambda 函数刚刚由失败的同一个 Terraform Apply 创建。
terraform 计划和 init 不会抛出任何有关 TF 配置问题的错误。
plan 和 init 都成功运行。
下面是我的目录结构

.
├── log_forwarder.tf
├── log_forwarder_lambdas
│   └── main.tf
└── providers.tf

下面是我的 providers.tf文件

provider "aws" {
  region  = "us-east-1"
  version = "3.9.0"
}
provider "aws" {
  alias   = "us-east-2"
  region  = "us-east-2"
  version = "3.9.0"
}
provider "aws" {
  alias   = "us-west-2"
  region  = "us-west-2"
  version = "3.9.0"
}  
provider "aws" {
  alias   = "us-west-1"
  region  = "us-west-1"
  version = "3.9.0"
}
provider "aws" {
  alias   = "ca-central-1"
  region  = "ca-central-1"
  version = "3.9.0"
}


... with all the AWS Regions.

以下是 log_forwarder.tf 的 tf 配置

terraform {
  required_version = "0.12.25"

  backend "s3" {
    All the backend Config
  }
}


resource "aws_iam_role" "log_forwarder" {
  name = "LogForwarder"

  assume_role_policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "",
      "Effect": "Allow",
      "Principal": {
        "Service": ["lambda.amazonaws.com"]
      },
      "Action": "sts:AssumeRole"
    }
  ]
}
EOF
}

resource "aws_iam_role_policy" "log_forwarder" {
  name = "LogForwarder"
  role = aws_iam_role.log_forwarder.id

  policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "lambda:ListTags",
        "logs:CreateLogGroup",
        "logs:CreateLogStream",
        "logs:PutLogEvents"
      ],
      "Resource": [
        "arn:aws:logs:*",
        "arn:aws:lambda:*"
      ]
    },
    {
      "Effect": "Allow",
      "Action": [
        "lambda:InvokeFunction"
      ],
      "Resource": "*"
    },
        {
    "Sid": "AWSDatadogPermissionsForCloudtrail",
    "Effect": "Allow",
    "Action": ["s3:ListBucket", "s3:GetBucketLocation", "s3:GetObject", "s3:ListObjects"],
    "Resource": [
        "arn:aws:s3:::BucketName",
        "arn:aws:s3:::BucketName/*"
    ]
}

  ]
}
EOF
}


module "DDLogForwarderUSEast1" {
  source                = "./log_forwarder_lambdas"
  dd_log_forwarder_role = aws_iam_role.log_forwarder.arn
  region                = "us-east-1"

}

module "DDLogForwarderUSEast2" {
  source                = "./log_forwarder_lambdas"
  dd_log_forwarder_role = aws_iam_role.log_forwarder.arn
  providers             = { aws = aws.us-east-2 }
  region                = "us-east-2"
}

module "DDLogForwarderUSWest1" {
  source                = "./log_forwarder_lambdas"
  dd_log_forwarder_role = aws_iam_role.log_forwarder.arn
  providers             = { aws = aws.us-west-1 }
  region                = "us-west-1"
}

module "DDLogForwarderUSWest2" {
  source                = "./log_forwarder_lambdas"
  dd_log_forwarder_role = aws_iam_role.log_forwarder.arn
  region                = "us-west-2"
  providers             = { aws = aws.us-west-2 }
}

module "DDLogForwarderAPEast1" {
  source                = "./log_forwarder_lambdas"
  dd_log_forwarder_role = aws_iam_role.log_forwarder.arn
  providers             = { aws = aws.ap-east-1 }
  region                = "ap-east-1"
}

module "DDLogForwarderAPSouth1" {
  source                = "./log_forwarder_lambdas"
  dd_log_forwarder_role = aws_iam_role.log_forwarder.arn
  region                = "ap-south-1"
  providers             = { aws = aws.ap-south-1 }
}

... All AWS Regions with different providers 

log_forwarder_lambdas/main.tf 的 TF 配置

variable "region" {}

variable "account_id" {
  default = "AWS Account Id"
}

variable "dd_log_forwarder_role" {}

variable "exclude_at_match" {
  default = "([A-Z]* RequestId: .*)"
}

data "aws_s3_bucket" "cloudtrail_bucket" {
  count  = var.region == "us-west-2" ? 1 : 0
  bucket = "BucketName"
}


resource "aws_lambda_function" "log_forwarder" {
  filename      = "${path.cwd}/log_forwarder_lambdas/aws-dd-forwarder-3.16.3.zip"
  function_name = "log-forwarder"
  role          = var.dd_log_forwarder_role
  description   = "Gathers logs from targetted Cloudwatch Log Groups and sends them to DataDog"
  handler       = "lambda_function.lambda_handler"
  runtime       = "python3.7"
  timeout       = 600
  memory_size   = 1024
  layers        = ["arn:aws:lambda:${var.region}:464622532012:layer:Datadog-Python37:11"]


  environment {
    variables = {
      DD_ENHANCED_METRICS = false
      EXCLUDE_AT_MATCH    = var.exclude_at_match
    }
  }
}

resource "aws_cloudwatch_log_group" "log_forwarder" {
  name              = "/aws/lambda/${aws_lambda_function.log_forwarder.function_name}"
  retention_in_days = 90
}

resource "aws_lambda_permission" "cloudtrail_bucket" {
  count         = var.region == "us-west-2" ? 1 : 0
  statement_id  = "AllowExecutionFromS3Bucket"
  action        = "lambda:InvokeFunction"
  function_name = aws_lambda_function.log_forwarder.arn
  principal     = "s3.amazonaws.com"
  source_arn    = element(data.aws_s3_bucket.cloudtrail_bucket.*.arn, count.index)
}

resource "aws_s3_bucket_notification" "cloudtrail_bucket_notification" {
  count  = var.region == "us-west-2" ? 1 : 0
  bucket = element(data.aws_s3_bucket.cloudtrail_bucket.*.id, count.index)


  lambda_function {
    lambda_function_arn = aws_lambda_function.log_forwarder.arn
    events              = ["s3:ObjectCreated:*"]
  }

  depends_on = [aws_lambda_permission.cloudtrail_bucket, aws_cloudwatch_log_group.log_forwarder]
}

在这种情况下，我使用的是 TF 0.12.25。
到目前为止我尝试过的事情。

每次运行 Terraform init/plan/apply 循环时，从根模块中删除 .terraform 文件夹

我已经尝试尽可能多地重构代码。

我在没有任何 CI 的情况下在本地运行 TF 计划/应用周期。

Answer 1

乍一看，Lambda 函数似乎不在您的 Terraform 状态中(无论出于何种原因)。您是否更改了后端/从后端删除了数据？
运行 terraform show和/或 terraform state show并查看冲突的 Lambda 函数是否处于您的状态。
如果不是，但它已经存在于 AWS 中，您可以导入它。
看这里:https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lambda_function#import

更新:
根据您的评论，由于资源存在于 AWS 中但不在状态中，因此这是预期错误。 (Terraform 不知道资源存在，因此尝试创建它；AWS 知道它已经存在，因此返回错误。)
你有两个选择:

删除AWS中的资源，再次运行Terraform；或

将现有资源导入 Terraform(推荐)。

尝试类似:

terraform import module.DDLogForwarderUSEast1.aws_lambda_function.log-forwarder log-forwarder

(如果在其他地区尝试此操作，请确保您设置了正确的提供商/地区!)