211 lines
7.0 KiB
Markdown
211 lines
7.0 KiB
Markdown
---
|
|
layout: "docs"
|
|
page_title: "Module Sources"
|
|
sidebar_current: "docs-modules-sources"
|
|
description: Explains the use of the source parameter, which tells Terraform where modules can be found.
|
|
---
|
|
|
|
# Module Sources
|
|
|
|
As documented in the [Usage section](/docs/modules/usage.html), the only required parameter when using a module is `source`. The `source` parameter tells Terraform where the module can be found and what constraints to put on the module. Constraints can include a specific version or Git branch.
|
|
|
|
Terraform manages modules for you: it downloads them, organizes them on disk, checks for updates, etc. Terraform uses this `source` parameter to determine where it should retrieve and update modules from.
|
|
|
|
Terraform supports the following sources:
|
|
|
|
* Local file paths
|
|
|
|
* GitHub
|
|
|
|
* BitBucket
|
|
|
|
* Generic Git, Mercurial repositories
|
|
|
|
* HTTP URLs
|
|
|
|
* S3 buckets
|
|
|
|
Each is documented further below.
|
|
|
|
## Local File Paths
|
|
|
|
The easiest source is the local file path. For maximum portability, this should be a relative file path into a subdirectory. This allows you to organize your Terraform configuration into modules within one repository, for example:
|
|
|
|
```
|
|
module "consul" {
|
|
source = "./consul"
|
|
}
|
|
```
|
|
|
|
Updates for file paths are automatic: when "downloading" the module using the [get command](/docs/commands/get.html), Terraform will create a symbolic link to the original directory. Therefore, any changes are automatically available.
|
|
|
|
## GitHub
|
|
|
|
Terraform will automatically recognize GitHub URLs and turn them into a link to the specific Git repository. The syntax is simple:
|
|
|
|
```
|
|
module "consul" {
|
|
source = "github.com/hashicorp/example"
|
|
}
|
|
```
|
|
|
|
Subdirectories within the repository can also be referenced:
|
|
|
|
```
|
|
module "consul" {
|
|
source = "github.com/hashicorp/example//subdir"
|
|
}
|
|
```
|
|
|
|
**Note:** The double-slash, `//`, is important. It is what tells Terraform that that is the separator for a subdirectory, and not part of the repository itself.
|
|
|
|
GitHub source URLs require that Git is installed on your system and that you have access to the repository.
|
|
|
|
You can use the same parameters to GitHub repositories as you can generic Git repositories (such as tags or branches). See the documentation for generic Git repositories for more information.
|
|
|
|
### Private GitHub Repos
|
|
|
|
If you need Terraform to be able to fetch modules from private GitHub repos on a remote machine (like Atlas or a CI server), you'll need to provide Terraform with credentials that can be used to authenticate as a user with read access to the private repo.
|
|
|
|
First, create a [machine user](https://developer.github.com/guides/managing-deploy-keys/#machine-users) on GitHub with read access to the private repo in question, then embed this user's credentials into the `source` parameter:
|
|
|
|
```
|
|
module "private-infra" {
|
|
source = "git::https://MACHINE-USER:MACHINE-PASS@github.com/org/privatemodules//modules/foo"
|
|
}
|
|
```
|
|
|
|
**Note:** Terraform does not yet support interpolations in the `source` field, so the machine username and password will have to be embedded directly into the `source` string. You can track [GH-1439](https://github.com/hashicorp/terraform/issues/1439) to learn when this limitation is addressed.
|
|
|
|
## BitBucket
|
|
|
|
Terraform will automatically recognize BitBucket URLs and turn them into a link to the specific Git or Mercurial repository, for example:
|
|
|
|
```
|
|
module "consul" {
|
|
source = "bitbucket.org/hashicorp/consul"
|
|
}
|
|
```
|
|
|
|
Subdirectories within the repository can also be referenced:
|
|
|
|
```
|
|
module "consul" {
|
|
source = "bitbucket.org/hashicorp/consul//subdir"
|
|
}
|
|
```
|
|
|
|
**Note:** The double-slash, `//`, is important. It is what tells Terraform that this is the separator for a subdirectory, and not part of the repository itself.
|
|
|
|
BitBucket URLs will require that Git or Mercurial is installed on your system, depending on the type of repository.
|
|
|
|
## Generic Git Repository
|
|
|
|
Generic Git repositories are also supported. The value of `source` in this case should be a complete Git-compatible URL. Using generic Git repositories requires that Git is installed on your system.
|
|
|
|
```
|
|
module "consul" {
|
|
source = "git://hashicorp.com/consul.git"
|
|
}
|
|
```
|
|
|
|
You can also use protocols such as HTTP or SSH to reference a module, but you'll have specify to Terraform that it is a Git module, by prefixing the URL with `git::` like so:
|
|
|
|
```
|
|
module "consul" {
|
|
source = "git::https://hashicorp.com/consul.git"
|
|
}
|
|
|
|
module "ami" {
|
|
source = "git::ssh://git@github.com/owner/repo.git"
|
|
}
|
|
```
|
|
|
|
If you do not specify the type of `source` then Terraform will attempt to use the closest match, for example assuming `https://hashicorp.com/consul.git` is a HTTP URL.
|
|
|
|
The URLs for Git repositories support the following query parameters:
|
|
|
|
* `ref` - The ref to checkout. This can be a branch, tag, commit, etc.
|
|
|
|
```
|
|
module "consul" {
|
|
source = "git::https://hashicorp.com/consul.git?ref=master"
|
|
}
|
|
```
|
|
|
|
## Generic Mercurial Repository
|
|
|
|
Generic Mercurial repositories are supported. The value of `source` in this case should be a complete Mercurial-compatible URL. Using generic Mercurial repositories requires that Mercurial is installed on your system. You must tell Terraform that your `source` is a Mercurial repository by prefixing it with `hg::`.
|
|
|
|
```
|
|
module "consul" {
|
|
source = "hg::http://hashicorp.com/consul.hg"
|
|
}
|
|
```
|
|
|
|
URLs for Mercurial repositories support the following query parameters:
|
|
|
|
* `rev` - The rev to checkout. This can be a branch, tag, commit, etc.
|
|
|
|
```
|
|
module "consul" {
|
|
source = "hg::http://hashicorp.com/consul.hg?ref=master"
|
|
}
|
|
```
|
|
|
|
## HTTP URLs
|
|
|
|
An HTTP or HTTPS URL can be used to redirect Terraform to get the module source from one of the other sources. For HTTP URLs, Terraform will make a `GET` request to the given URL. An additional `GET` parameter, `terraform-get=1`, will be appended, allowing
|
|
you to optionally render the page differently when Terraform is requesting it.
|
|
|
|
Terraform then looks for the resulting module URL in the following order:
|
|
|
|
1. Terraform will look to see if the header `X-Terraform-Get` is present. The header should contain the source URL of the actual module.
|
|
|
|
2. Terraform will look for a `<meta>` tag with the name of `terraform-get`, for example:
|
|
|
|
```
|
|
<meta name=“terraform-get” content="github.com/hashicorp/example" />
|
|
```
|
|
|
|
### S3 Bucket
|
|
|
|
Terraform can also store modules in an S3 bucket. To access the bucket
|
|
you must have appropriate AWS credentials in your configuration or
|
|
available via shared credentials or environment variables.
|
|
|
|
There are a variety of S3 bucket addressing schemes, most are
|
|
[documented in the S3
|
|
configuration](http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingBucket.html#access-bucket-intro).
|
|
Here are a couple of examples.
|
|
|
|
Using the `s3` protocol.
|
|
|
|
```
|
|
module "consul" {
|
|
source = "s3::https://s3-eu-west-1.amazonaws.com/consulbucket/consul.zip"
|
|
}
|
|
```
|
|
|
|
Or directly using the bucket's URL.
|
|
|
|
```
|
|
module "consul" {
|
|
source = "consulbucket.s3-eu-west-1.amazonaws.com/consul.zip"
|
|
}
|
|
```
|
|
|
|
|
|
## Unarchiving
|
|
|
|
Terraform will automatically unarchive files based on the extension of
|
|
the file being requested (over any protocol). It supports the following
|
|
archive formats:
|
|
|
|
* tar.gz and tgz
|
|
* tar.bz2 and tbz2
|
|
* zip
|
|
* gz
|
|
* bz2
|
|
|