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 on your machine (version 1.6+ is required). Alternatively, you can use the Vagrantfile in the root of this repo to stand up a virtual machine with the appropriate dev tooling already set up for you.
For local dev first make sure Go is properly installed, including setting up a GOPATH. You will also need to add
$GOPATH/bin to your
$PATH. Next, install the following software packages, which are needed for some dependencies:
Next, using Git, clone this repository into
$GOPATH/src/github.com/hashicorp/terraform. All the necessary dependencies are either vendored or automatically installed, so you just need to type
make. This will compile the code and then run the tests. If this exits with exit status 0, then everything is working!
To compile a development version of Terraform and the built-in plugins, run
make dev. This will build everything using gox and 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 ...
If you're working on a specific provider and only wish to rebuild that provider, you can use the
plugin-dev target. For example, to build only the Azure provider:
$ make plugin-dev PLUGIN=provider-azure
If you're working on the core of Terraform, and only wish to rebuild that without rebuilding providers, you can use the
core-dev target. It is important to note that some types of changes may require both core and providers to be rebuilt - for example work on the RPC interface. To build just the core of Terraform:
$ make core-dev
godep operations follow this pattern:
- Get current state of dependencies into your
- Make changes to the packages in
godepto capture those changes in the Terraform repo.
If you're developing Terraform, there are a few tasks you might need to perform.
Adding a dependency
If you're adding a dependency, you'll need to vendor it in the same Pull Request as the code that depends on it. You should do this in a separate commit from your code, as makes PR review easier and Git history simpler to read in the future.
Because godep captures new dependencies from the local
$GOPATH, you first need to
godep restore from the master branch to ensure that the only diff is your new dependency.
Assuming your work is on a branch called
my-feature-branch, the steps look like this:
# Get latest master branch's dependencies staged in local $GOPATH git checkout master git pull godep restore -v # Capture the new dependency referenced from my-feature-branch git checkout my-feature-branch git rebase master godep save ./... # There should now be a diff in `vendor/` with added files for your dependency, # and a diff in Godeps/Godeps.json with metadata for your dependency. # Make a commit with your new dependencies added git add -A git commit -m "vendor: Capture new dependency upstream-pkg" # Push to your branch (may need -f if you rebased) git push origin my-feature-branch
Updating a dependency
If you're updating an existing dependency, godep provides a specific command to snag the newer version from your
# Get latest master branch's dependencies staged in local $GOPATH git checkout master git pull godep restore -v # Make your way to the dependency in question and checkout the target ref pushd $GOPATH/src/github.com/some/dependency git checkout v-1.next # Head back to Terraform on a feature branch and update the dependncy to the # version currently in your $GOPATH popd git checkout my-feature-branch godep update github.com/some/dependency/... # There should now be a diff in `vendor/` with changed files for your dependency, # and a diff in Godeps/Godeps.json with metadata for the updated dependency. # Make a commit with the updated dependency git add -A git commit -m "vendor: Update dependency upstream-pkg to 1.4.6" # Push to your branch git push origin my-feature-branch
Terraform has a comprehensive acceptance test suite covering the built-in providers. Our Contributing Guide includes details about how and when to write and run acceptance tests in order to help contributions get accepted quickly.
Cross Compilation and Building for Distribution
If you wish to cross-compile Terraform for another architecture, you can set the
XC_ARCH environment variables to values representing the target operating system and architecture before calling
make. The output is placed in the
pkg subdirectory tree both expanded in a directory representing the OS/architecture combination and as a ZIP archive.
For example, to compile 64-bit Linux binaries on Mac OS X Linux, you can run:
$ XC_OS=linux XC_ARCH=amd64 make bin ... $ file pkg/linux_amd64/terraform terraform: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, not stripped
XC_ARCH can be space separated lists representing different combinations of operating system and architecture. For example, to compile for both Linux and Mac OS X, targeting both 32- and 64-bit architectures, you can run:
$ XC_OS="linux darwin" XC_ARCH="386 amd64" make bin ... $ tree ./pkg/ -P "terraform|*.zip" ./pkg/ ├── darwin_386 │ └── terraform ├── darwin_386.zip ├── darwin_amd64 │ └── terraform ├── darwin_amd64.zip ├── linux_386 │ └── terraform ├── linux_386.zip ├── linux_amd64 │ └── terraform └── linux_amd64.zip 4 directories, 8 files
Note: Cross-compilation uses gox, which requires toolchains to be built with versions of Go prior to 1.5. In order to successfully cross-compile with older versions of Go, you will need to run
gox -build-toolchain before running the commands detailed above.