Terraform报错：未声明security-groups模块引用问题求助

项目结构 #

├── deployment
│   ├── security-groups
│   │   ├── data.tf
│   │   ├── outputs.tf
│   │   ├── providers.tf
│   │   ├── sg-eks.tf
│   │   ├── terraform.auto.tfvars
│   │   └── variables.tf
│   └── vpc
│       ├── data.tf
│       ├── locals.tf
│       ├── main.tf
│       ├── outputs.tf
│       ├── providers.tf
│       ├── terraform.auto.tfvars
│       └── variables.tf
├── modules
│   ├── security-groups
│   │   ├── main.tf
│   │   ├── outputs.tf
│   │   └── variables.tf
│   └── vpc
│       ├── data.tf
│       ├── locals.tf
│       ├── main.tf
│       ├── outputs.tf
│       └── variables.tf

VPC模块配置（正常工作） #

modules/vpc/outputs.tf #

output "vpc_id" {
  description = "The VPC ID"
  value       = aws_vpc.vpc.id
}

output "public_subnets" {
  description = "List of IDs of public subnets"
  value       = values(aws_subnet.public)[*].id
}

output "private_subnets" {
  description = "List of IDs of private subnets"
  value       = values(aws_subnet.private)[*].id
}

deployment/vpc/outputs.tf #

output "vpc_id" {
  description = "The VPC ID"
  value       = module.vpc.vpc_id
}

output "public_subnets" {
  description = "List of IDs of public subnets"
  value       = module.vpc.public_subnets
}

output "private_subnets" {
  value       = module.vpc.private_subnets
}

VPC模块的plan和apply操作正常，输出可在Terraform Cloud远程状态中调用。

安全组模块配置（报错场景） #

modules/security-groups/outputs.tf #

output "security_group_arn" {
  description = "The ARN of the security group"
  value       = values(aws_security_group.sg)[*].arn
}

deployment/security-groups/outputs.tf #

output "security_group_arn" {
  description = "The ARN of the security group"
  value       = module.security-groups.security_group_arn
} 

执行时出现报错：

Reference to undeclared module No module call named "security-groups" is declared in the root module

已通过source "/barak-kalai/terraform-infra.git//modules/security-groups?ref=dev"引入模块，移除output配置后plan操作正常，说明模块本身调用无问题。

解决方案 #

报错核心原因：你在outputs.tf里引用的模块名称security-groups，和实际在deployment/security-groups目录下调用模块时定义的本地模块名称不一致。

修复步骤： #

1. 打开deployment/security-groups目录下的模块调用文件（比如sg-eks.tf），找到你定义的模块块，比如：

   module "sg_eks" {
     source = "/barak-kalai/terraform-infra.git//modules/security-groups?ref=dev"
     # 其他变量配置
   }
   

   这里的sg_eks就是该模块在当前根模块中的本地名称。

2. 修改deployment/security-groups/outputs.tf中的引用，将module.security-groups替换为实际的本地模块名称，比如上面例子中的module.sg_eks：

   output "security_group_arn" {
     description = "The ARN of the security group"
     value       = module.sg_eks.security_group_arn
   } 
   

3. 重新执行terraform plan验证，报错将消失，模块输出可正常被其他模块复用。

内容的提问来源于stack exchange，提问作者Barak