1bff623fd9
In most cases Terraform will be able to automatically fully resolve all of the pending move statements before creating a plan, but there are some edge cases where we can end up wanting to move one object to a location where another object is already declared. One relatively-obvious example is if someone uses "terraform state mv" in order to create a set of resource instance bindings that could never have arising in normal Terraform use. A less obvious example arises from the interactions between moves at different levels of granularity. If we are both moving a module to a new address and moving a resource into an instance of the new module at the same time, the old module might well have already had a resource of the same name and so the resource move will be unresolvable. In these situations Terraform will move the objects as far as possible, but because it's never valid for a move "from" address to still be declared in the configuration Terraform will inevitably always plan to destroy the objects that didn't find a final home. To give some additional explanation for that result, here we'll add a warning which describes what happened. This is not a particularly actionable warning because we don't really have enough information to guess what the user intended, but we do at least prompt that they might be able to use the "terraform state" family of subcommands to repair the ambiguous situation before planning, if they want a different result than what Terraform proposed. |
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README.md
Terraform
- Website: https://www.terraform.io
- Forums: HashiCorp Discuss
- Documentation: https://www.terraform.io/docs/
- Tutorials: HashiCorp's Learn Platform
- Certification Exam: HashiCorp Certified: Terraform Associate
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
Documentation is available on the Terraform website:
If you're new to Terraform and want to get started creating infrastructure, please check out our Getting Started guides on HashiCorp's learning platform. There are also additional guides to continue your learning.
Show off your Terraform knowledge by passing a certification exam. Visit the certification page for information about exams and find study materials on HashiCorp's learning platform.
Developing Terraform
This repository contains only Terraform core, which includes the command line interface and the main graph engine. Providers are implemented as plugins, and Terraform can automatically download providers that are published on the Terraform Registry. HashiCorp develops some providers, and others are developed by other organizations. For more information, see Extending Terraform.
To learn more about compiling Terraform and contributing suggested changes, please refer to the contributing guide.
To learn more about how we handle bug reports, please read the bug triage guide.