Terraform-尽管变量已在同一文件中声明，但找不到变量的资源

Question

Terraform找不到在引用所在的文件中声明的资源。

看来这行正在引起麻烦：role_arn = "${aws_iam_role.newsapi_lambda_codepipeline.arn}"。它找不到newsapi_lambda_codepipeline哪个声明为resource "aws_iam_role" "newsapi_lambda_codepipeline" { ... }。

这是我的main.tf：

resource "aws_s3_bucket" "newsapi_lambda_builds" {
  bucket = "newsapi-lambda-builds"
  acl    = "private"
}

resource "aws_iam_role" "newsapi_lambda_codebuild" {
  name = "newsapi-lambda-codebuild"

  assume_role_policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": [
        "s3:GetObject",
        "s3:GetObjectVersion",
        "s3:GetBucketVersioning"
      ],
      "Resource": "arn:aws:s3:::newsapi_lambda_builds",
      "Effect": "Allow"
    },
    {
      "Action": [
        "s3:PutObject"
      ],
      "Resource": [
        "arn:aws:s3:::newsapi_lambda_builds"
      ],
      "Effect": "Allow"
    },
    {
      "Action": [
        "lambda:invokefunction",
        "lambda:listfunctions"
      ],
      "Resource": "*",
      "Effect": "Allow"
    },
    {
      "Effect": "Allow",
      "Resource": [
        "*"
      ],
      "Action": [
        "logs:CreateLogGroup",
        "logs:CreateLogStream",
        "logs:PutLogEvents"
      ]
    }
  ]
}
EOF
}
resource "aws_iam_role" "newsapi_lambda_codepipeline" {
  name = "newsapi-lambda-codepipeline"

  assume_role_policy = <<EOF
{
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": "codepipeline.amazonaws.com"
      },
      "Action": "sts:AssumeRole"
    },
    {
      "Action": [
        "s3:GetObject",
        "s3:GetObjectVersion",
        "s3:GetBucketVersioning"
      ],
      "Resource": "${aws_s3_bucket.newsapi_lambda_builds.arn}",
      "Resource": "${aws_s3_bucket.newsapi_lambda_builds.arn}/*"
      "Effect": "Allow"
    },
    {
      "Action": [
        "s3:PutObject"
      ],
      "Resource": [
        "arn:aws:s3:::newsapi_lambda_builds"
      ],
      "Effect": "Allow"
    },
    {
      "Effect": "Allow",
      "Action": [
        "codebuild:BatchGetBuilds",
        "codebuild:StartBuild"
      ],
      "Resource": "*"
    }
  ],
  "Version": "2012-10-17"
}
EOF
}


resource "aws_codepipeline" "newsapi_lambda" {
  name     = "newsapi-lambda"
  role_arn = "${aws_iam_role.newsapi_lambda_codepipeline.arn}"

  artifact_store {
    location = "${aws_s3_bucket.newsapi_lambda_builds.bucket}"
    type     = "S3"
  }

  stage {
    name = "Source"

    action {
      name             = "Source"
      category         = "Source"
      owner            = "ThirdParty"
      provider         = "GitHub"
      version          = "1"
      output_artifacts = ["newsapi_lambda"]

      configuration {
        Owner      = "Defozo"
        Repo       = "traceitfor.me_newsapi_lambda"
        Branch     = "master"
      }
    }
  }

  stage {
    name = "Build"

    action {
      name            = "Build"
      category        = "Build"
      owner           = "AWS"
      provider        = "CodeBuild"
      input_artifacts = ["newsapi_lambda"]
      version         = "1"
      role_arn = "${aws_iam_role.newsapi_lambda_codebuild.arn}"

      configuration {
        ProjectName = "newsapi-lambda"
      }
    }
  }
}

执行后，terraform apply我得到：

Error: Error running plan: 1 error(s) occurred:

* aws_codepipeline.newsapi_lambda: 1 error(s) occurred:

* aws_codepipeline.newsapi_lambda: Resource 'aws_iam_role.newsapi_lambda_codepipeline' not found for variable 'aws_iam_role.newsapi_lambda_codepipeline.arn'

我不明白为什么会这样。我已经aws_iam_role.newsapi_lambda_codepipeline声明了，不是吗？

Answer 1

我相信您的角色声明可能会略有错误。terraform无法为此生成一个arn，因此未找到。

看来您也需要创建resource "aws_iam_role_policy"。参见https://www.terraform.io/docs/providers/aws/r/codepipeline.html 尚不清楚为什么需要拆分。

如果不是这种情况，请告诉我，我将尝试自行运行代码进行测试。

Answer 2

对于那些在aws_ecs_task_definition找不到变量的情况下遇到问题的人aws_ecs_task_definition.XXX.arn，很有可能您的JSON格式错误。这是我为纠正我的问题所做的

• 替换为 task_definition = "[]"
• 跑 terraform plan

此时，您应该会得到一个错误。例如，我得到了

module.tf.aws_ecs_task_definition.sandbox：ECS任务定义container_definitions无效：解码JSON时出错：json：无法将字符串解组到Go结构字段ContainerDefinition.MemoryReservation int64类型

在这种情况下，我用引号引起memSize来template_file，但它没有隐式转换为int64，因此出现错误。

我换"memoryReservation": "${mem_size}"到"memoryReservation": ${mem_size}，去掉了task_definition占位符，一切顺利。