lambda - Terraform cloudwatch 保留逻辑

Question

我正在尝试向我的 Terraform 脚本添加逻辑，以便在创建 lambda 时添加 CW 保留逻辑，以便我们的日志在 30 天后清除。我看到的是，当运行 terraform 以更新现有的 lambda(在添加我的新保留逻辑之前部署)时，我的工作失败并出现以下错误。

• aws_cloudwatch_log_group.lambda-deploy: 1 error(s) occurred:

• aws_cloudwatch_log_group.lambda-deploy: Creating CloudWatch Log Group failed: ResourceAlreadyExistsException: The specified log group already exists status code: 400, request id: e500eb50-4a81-11e9-9c08-7152b4a0ad31: The CloudWatch Log Group '/aws/lambda/{lambda-name}' already exists.

下面是我如何设置 Terraform 代码:​​

resource "aws_lambda_function" "lambda-deploy" {
  filename      = "${var.filename}"
  function_name = "${var.functionname}"
  role          = "${var.role}"
  handler       = "${var.handler}"
  runtime       = "${var.runtime}"
  publish       = "${var.publish}"
  memory_size   = "${var.memory_size}"
  timeout       = "${var.timeout}"
  description   = "${var.description}"

  layers = "${var.layers}"

  environment {
    variables = "${var.envVars}"
  }

  tags {
    PLATFORM        = "${var.tag_PLATFORM}"
    BUSINESS_UNIT   = "${var.tag_BUSINESS_UNIT}"
    CLIENT          = "${var.tag_CLIENT}"
    BUSINESS_REGION = "${var.tag_BUSINESS_REGION}"
  }

  vpc_config {
    subnet_ids         = "${var.subnet_ids}"
    security_group_ids = "${var.security_group_ids}"
  }
}

#Below logic will add cloud watch retention logic so logs rotate after 30 days.
resource "aws_cloudwatch_log_group" "lambda-deploy" {
  name              = "/aws/lambda/${aws_lambda_function.lambda-deploy.function_name}"
  retention_in_days = "30"
}

我的问题是，aws_cloudwatch_log_group 资源是否可以检查是否已创建 cloudwatch 组并仅更新保留策略而不是尝试创建日志组？

Answer 1

1. 注释掉名称参数

以上面的例子为例:

resource "aws_cloudwatch_log_group" "lambda-deploy" {
  name = "/aws/lambda/${aws_lambda_function.lambda-deploy.function_name}"
  retention_in_days = "30"
}  

变成:

resource "aws_cloudwatch_log_group" "lambda-deploy" {
  #name = "/aws/lambda/${aws_lambda_function.lambda-deploy.function_name}"
  retention_in_days = "30"
}

1. 导入资源

   terraform import aws_cloudwatch_log_group.lambda-deploy/aws/lambda/${aws_lambda_function.lambda-deploy.function_name}

其中 ${aws_lambda_function.lambda-deploy.function_name} 是您在 AWS 中拥有的内容。

1. 取消注释您的“名称”参数并运行 terraform plan，您的日志组现在由 terraform 管理......呸!