website: providers and variables

website/source/docs/configuration/providers.html.md

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+---
+layout: "docs"
+page_title: "Configuring Providers"
+sidebar_current: "docs-config-providers"
+---
+
+# Provider Configuration
+
+Providers are responsible in Terraform for managing the lifecycle
+of a [resource](/docs/configuration/resource.html): create,
+read, update, delete.
+
+Every resource in Terraform is mapped to a provider based
+on longest-prefix matching. For example the `aws_instance`
+resource type would map to the `aws` provider (if that exists).
+
+Most providers require some sort of configuration to provide
+authentication information, endpoint URLs, etc. Provider configuration
+blocks are a way to set this information globally for all
+matching resources.
+
+This page assumes you're familiar with the
+[configuration syntax](/docs/configuration/syntax.html)
+already.
+
+## Example
+
+A provider configuration looks like the following:
+
+```
+provider "aws" {
+	access_key = "foo"
+	secret_key = "bar"
+	region = "us-east-1"
+}
+```
+
+## Decription
+
+The `provider` block configures the provider of the given `NAME`.
+Multiple provider blocks can be used to configure multiple providers.
+
+Terraform matches providers to resources by matching two criteria.
+Both criteria must be matched for a provider to manage a resource:
+
+  * They must share a common prefix. Longest matching prefixes are
+    tried first. For example, `aws_instance` would choose the
+    `aws` provider.
+
+  * The provider must report that it supports the given resource
+    type. Providers internally tell Terraform the list of resources
+    they support.
+
+Within the block (the `{ }`) is configuration for the resource.
+The configuration is dependent on the type, and is documented
+[for each provider](/docs/providers/index.html).
+
+## Syntax
+
+The full syntax is:
+
+```
+provider NAME {
+	CONFIG ...
+}
+```
+
+where `CONFIG` is:
+
+```
+KEY = VALUE
+
+KEY {
+	CONFIG
+}
+```

website/source/docs/configuration/variables.html.md

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+---
+layout: "docs"
+page_title: "Configuring Variables"
+sidebar_current: "docs-config-variables"
+---
+
+# Variable Configuration
+
+Variables define the parameterization of Terraform configurations.
+Variables can be overridden via the CLI. Variable usage is
+covered in more detail in the
+[getting started guide](/intro/getting-started/variables.html).
+This page covers configuration syntax for variables.
+
+This page assumes you're familiar with the
+[configuration syntax](/docs/configuration/syntax.html)
+already.
+
+## Example
+
+A variable configuration looks like the following:
+
+```
+variable "key" {}
+
+variable "images" {
+	default = {
+		"us-east-1": "image-1234",
+		"us-west-2": "image-4567",
+	}
+}
+```
+
+## Decription
+
+The `variable`  block configures a single input variable for
+a Terraform configuration. Multiple variables blocks can be used to
+add multiple variables.
+
+The `NAME` given to the variable block is the name used to
+set the variable via the CLI as well as reference the variable
+throughout the Terraform configuration.
+
+Within the block (the `{ }`) is configuration for the variable.
+These are the parameters that can be set:
+
+  * `default` (optional) - If set, this sets a default value
+    for the variable. If this isn't set, the variable is required
+    and Terraform will error if not set. The default value can be
+    a string or a mapping. This is covered in more detail below.
+
+  * `description` (optional) - A human-friendly description for
+    the variable. This is primarily for documentation for users
+    using your Terraform configuration. A future version of Terraform
+    will expose these descriptions as part of some Terraform CLI
+    command.
+
+------
+
+**Default values** can be either strings or maps. If a default
+value is omitted and the variable is required, the value assigned
+via the CLI must be a string.
+
+String values are simple and represent a basic key to value
+mapping where the key is the variable name. An example is:
+
+```
+variable "key" {
+	default = "value"
+}
+```
+
+A map allows a key to contain a lookup table. This is useful
+for some values that change depending on some external pivot.
+A common use case for this is mapping cloud images to regions.
+An example:
+
+```
+variable "images" {
+	default = {
+		"us-east-1": "image-1234",
+		"us-west-2": "image-4567",
+	}
+}
+```
+
+The usage of maps, strings, etc. is documented fully in the
+[interpolation syntax](/docs/configuration/interpolation.html)
+page.
+
+## Syntax
+
+The full syntax is:
+
+```
+variable NAME {
+	[default = DEFAULT]
+	[description = DESCRIPTION]
+}
+```
+
+where `DEFAULT` is:
+
+```
+VALUE
+
+{
+	KEY: VALUE,
+	...
+}
+```