如何通过Terraform AWS Lambda模块引用本地打包的源文件

你同时配置了store_on_s3 = true和create_package = false，该版本Lambda模块的local_existing_package参数默认仅在不使用S3存储的场景下生效。当store_on_s3开启时，模块会强制走S3部署逻辑，需要用到打包流程生成的local.archive_filename变量拼接S3对象键，而你设置create_package = false禁用了所有包处理流程，导致该变量为空，触发报错。

方案1：直接使用本地包部署（不存S3） #

调整配置关闭S3存储逻辑即可，修改后的配置如下：

module "my_lambda_fn" {
  source  = "terraform-aws-modules/lambda/aws"
  version = "~>2.17.0"

  function_name = "my-api-fn"
  description   = "Function for example"
  handler       = "src/index.handler"
  runtime       = "nodejs14.x"
  timeout       = 10
  memory_size   = 512
  publish       = true
  cloudwatch_logs_retention_in_days = 60
  attach_tracing_policy = true
  tracing_mode          = "Active"

  # 预打包本地包配置
  create_package         = false
  local_existing_package = "${path.module}/../source.zip"

  # 关闭S3存储，直接读取本地包部署
  store_on_s3 = false
}

方案2：需要将本地包上传到S3再部署 #

如果场景要求必须把部署包存在S3，不需要设置create_package = false，模块会自动识别本地预打包文件、跳过源码打包步骤直接上传到S3，修改后的配置如下：

module "my_lambda_fn" {
  source  = "terraform-aws-modules/lambda/aws"
  version = "~>2.17.0"

  function_name = "my-api-fn"
  description   = "Function for example"
  handler       = "src/index.handler"
  runtime       = "nodejs14.x"
  timeout       = 10
  memory_size   = 512
  publish       = true
  cloudwatch_logs_retention_in_days = 60
  attach_tracing_policy = true
  tracing_mode          = "Active"

  # 预打包本地包配置
  local_existing_package = "${path.module}/../source.zip"

  store_on_s3 = true
  s3_bucket   = module.s3_bucket.s3_bucket_id
}

内容的提问来源于stack exchange，提问作者rlcrews