91752f02da
Following on from de652e22a26b, this introduces deprecation warnings for when an attribute value expression is a template with only a single interpolation sequence, and for variable type constraints given in quotes. As with the previous commit, we allowed these deprecated forms with no warning for a few releases after v0.12.0 to ensure that folks who need to write cross-compatible modules for a while during upgrading would be able to do so, but we're now marking these as explicitly deprecated to guide users towards the new idiomatic forms. The "terraform 0.12upgrade" tool would've already updated configurations to not hit these warnings for those who had pre-existing configurations written for Terraform 0.11. The main target audience for these warnings are newcomers to Terraform who are learning from existing examples already published in various spots on the wider internet that may be showing older Terraform syntax, since those folks will not be running their configurations through the upgrade tool. These warnings will hopefully guide them towards modern Terraform usage during their initial experimentation, and thus reduce the chances of inadvertently adopting the less-readable legacy usage patterns in greenfield projects. |
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README.md
Terraform
- Website: https://www.terraform.io
- Mailing list: Google Groups
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:
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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.
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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.
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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.
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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
If you're new to Terraform and want to get started creating infrastructure, please checkout our Getting Started guide, available on the Terraform website.
All documentation is available on the Terraform website:
Developing Terraform
This repository contains only Terraform core, which includes the command line interface and the main graph engine. Providers are implemented as plugins that each have their own repository in the terraform-providers organization on GitHub. Instructions for developing each provider are in the associated README file. For more information, see the provider development overview.
To learn more about compiling Terraform and contributing suggested changes, please refer to the contributing guide.