e6a76d8ba0
Because "moved" blocks produce changes that span across more than one resource instance address at the same time, we need to take extra care with them during planning. The -target option allows for restricting Terraform's attention only to a subset of resources when planning, as an escape hatch to recover from bugs and mistakes. However, we need to avoid any situation where only one "side" of a move would be considered in a particular plan, because that'd create a new situation that would be otherwise unreachable and would be difficult to recover from. As a compromise then, we'll reject an attempt to create a targeted plan if the plan involves resolving a pending move and if the source address of that move is not included in the targets. Our error message offers the user two possible resolutions: to create an untargeted plan, thus allowing everything to resolve, or to add additional -target options to include just the existing resource instances that have pending moves to resolve. This compromise recognizes that it is possible -- though hopefully rare -- that a user could potentially both be recovering from a bug or mistake at the same time as processing a move, if e.g. the bug was fixed by upgrading a module and the new version includes a new "moved" block. In that edge case, it might be necessary to just add the one additional address to the targets rather than removing the targets altogether, if creating a normal untargeted plan is impossible due to whatever bug they're trying to recover from. |
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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.