Terraform is a tool for building, changing, and versioning infrastructure safely and efficiently. Terraform can manage existing and popular service providers as well as custom in-house solutions.
The key features of Terraform are:
Infrastructure as Code: Infrastructure is described using a high-level configuration syntax. This allows a blueprint of your datacenter to be versioned and treated as you would any other code. Additionally, infrastructure can be shared and re-used.
Execution Plans: Terraform has a "planning" step where it generates an execution plan. The execution plan shows what Terraform will do when you call apply. This lets you avoid any surprises when Terraform manipulates infrastructure.
Resource Graph: Terraform builds a graph of all your resources, and parallelizes the creation and modification of any non-dependent resources. Because of this, Terraform builds infrastructure as efficiently as possible, and operators get insight into dependencies in their infrastructure.
Change Automation: Complex changesets can be applied to your infrastructure with minimal human interaction. With the previously mentioned execution plan and resource graph, you know exactly what Terraform will change and in what order, avoiding many possible human errors.
For more information, see the introduction section of the Terraform website.
Getting Started & Documentation
All documentation is available on the Terraform website.
If you wish to work on Terraform itself or any of its built-in providers,
you'll first need Go installed (version 1.2+ is
required). Make sure Go is properly installed, including setting up
a GOPATH. Make sure Go is compiled
with cgo support. You can verify this by running
go env and checking that
CGOENABLED is set to "1".
Next, install Git, which is needed for some dependencies.
Then, install Gox, which is used as a compilation tool on top of Go:
$ go get -u github.com/mitchellh/gox
Next, clone this repository into
Install the necessary dependencies by running
make updatedeps and then just
make. This will compile some more dependencies and then run the tests. If
this exits with exit status 0, then everything is working!
$ make updatedeps ... $ make ...
To compile a development version of Terraform and the built-in plugins,
make dev. This will put Terraform binaries in the
$ make dev ... $ bin/terraform ...
If you're developing a specific package, you can run tests for just that
package by specifying the
TEST variable. For example below, only
terraform package tests will be run.
$ make test TEST=./terraform ...
Terraform also has a comprehensive acceptance test suite covering most of the major features of the built-in providers.
If you're working on a feature of a provider and want to verify it is functioning (and hasn't broken anything else), we recommend running the acceptance tests. Note that we do not require that you run or write acceptance tests to have a PR accepted. The acceptance tests are just here for your convenience.
Warning: The acceptance tests create/destroy/modify real resources, which may incur real costs. In the presence of a bug, it is technically possible that broken providers could corrupt existing infrastructure as well. Therefore, please run the acceptance providers at your own risk. At the very least, we recommend running them in their own private account for whatever provider you're testing.
To run the acceptance tests, invoke
$ make testacc TEST=./builtin/providers/aws TESTARGS='-run=VPC' ...
TEST variable is required, and you should specify the folder where
the provider is. The
TESTARGS variable is recommended to filter down
to a specific resource to test, since testing all of them at once can
take a very long time.
Acceptance tests typically require other environment variables to be set for things such as access keys. The provider itself should error early and tell you what to set, so it is not documented here.
There is no documentation for this package.
The config package is responsible for loading and validating the configuration.
|The config package is responsible for loading and validating the configuration.|
The depgraph package is used to create and model a dependency graph of nouns.
|The depgraph package is used to create and model a dependency graph of nouns.|
The plugin package exposes functions and helpers for communicating to Terraform plugins which are implemented as standalone binary applications.
|The plugin package exposes functions and helpers for communicating to Terraform plugins which are implemented as standalone binary applications.|