# Using a Module for Common Configurations

> Markdown source of <https://docs.calebsargeant.com/computing/terraform/getting-started/using-a-module-for-common-configurations/>.

## Terraform Modules

- Code reuse
- Remote or local source
  - Terraform Registry
- Root module
- Versioning
- Provider inheritance
- Multiple instances (no count)

### Module Components

- Input variables
- Resources
- Output values

### Terraform Module Example

``` text
variable "name" {}
resource "aws_s3_bucket" "bucket" {
  name = var.name
  [...]
}

output "bucket_id" {
  value = aws_s3_bucket.bucket.id
}

#Create module bucket
module "bucket" {
  name = "taco-bucket"
  source ./modules/s3
}

#Use taco-bucket
resouce "aws_s3_bucket_object" {
  bucket = module.bucket.bucket_id
  [...]
}
```

### VPC Module

[resources.tf#L84](https://github.com/CalebSargeant/Getting-Started-Terraform/blob/master/m8/resources.tf#L84)

### S3 Module

[s3](https://github.com/CalebSargeant/Getting-Started-Terraform/tree/master/m8/Modules/s3)