135 lines
6.2 KiB
Markdown
135 lines
6.2 KiB
Markdown
---
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layout: "docs"
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page_title: "Command: plan"
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sidebar_current: "docs-commands-plan"
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description: |-
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The `terraform plan` command is used to create an execution plan. Terraform performs a refresh, unless explicitly disabled, and then determines what actions are necessary to achieve the desired state specified in the configuration files. The plan can be saved using `-out`, and then provided to `terraform apply` to ensure only the pre-planned actions are executed.
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---
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# Command: plan
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> For a hands-on tutorial, try the [Get Started](https://learn.hashicorp.com/terraform/getting-started/intro?utm_source=WEBSITE&utm_medium=WEB_IO&utm_offer=ARTICLE_PAGE&utm_content=DOCS) track on HashiCorp Learn.
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The `terraform plan` command is used to create an execution plan. Terraform
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performs a refresh, unless explicitly disabled, and then determines what
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actions are necessary to achieve the desired state specified in the
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configuration files.
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This command is a convenient way to check whether the execution plan for a
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set of changes matches your expectations without making any changes to
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real resources or to the state. For example, `terraform plan` might be run
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before committing a change to version control, to create confidence that it
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will behave as expected.
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The optional `-out` argument can be used to save the generated plan to a file
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for later execution with `terraform apply`, which can be useful when
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[running Terraform in automation](https://learn.hashicorp.com/terraform/development/running-terraform-in-automation).
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If Terraform detects no changes to resource or to root module output values,
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`terraform plan` will indicate that no changes are required.
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## Usage
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Usage: `terraform plan [options] [dir]`
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By default, `plan` requires no flags and looks in the current directory
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for the configuration and state file to refresh.
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The command-line flags are all optional. The list of available flags are:
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* `-compact-warnings` - If Terraform produces any warnings that are not
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accompanied by errors, show them in a more compact form that includes only
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the summary messages.
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* `-destroy` - If set, generates a plan to destroy all the known resources.
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* `-detailed-exitcode` - Return a detailed exit code when the command exits.
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When provided, this argument changes the exit codes and their meanings to
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provide more granular information about what the resulting plan contains:
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* 0 = Succeeded with empty diff (no changes)
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* 1 = Error
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* 2 = Succeeded with non-empty diff (changes present)
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* `-input=true` - Ask for input for variables if not directly set.
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* `-lock=true` - Lock the state file when locking is supported.
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* `-lock-timeout=0s` - Duration to retry a state lock.
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* `-no-color` - Disables output with coloring.
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* `-out=path` - The path to save the generated execution plan. This plan
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can then be used with `terraform apply` to be certain that only the
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changes shown in this plan are applied. Read the warning on saved
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plans below.
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* `-parallelism=n` - Limit the number of concurrent operation as Terraform
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[walks the graph](/docs/internals/graph.html#walking-the-graph). Defaults
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to 10.
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* `-refresh=true` - Update the state prior to checking for differences.
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* `-state=path` - Path to the state file. Defaults to "terraform.tfstate".
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Ignored when [remote state](/docs/state/remote.html) is used.
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* `-target=resource` - A [Resource
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Address](/docs/internals/resource-addressing.html) to target. This flag can
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be used multiple times. See below for more information.
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* `-var 'foo=bar'` - Set a variable in the Terraform configuration. This flag
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can be set multiple times. Variable values are interpreted as
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[HCL](/docs/configuration/syntax.html#HCL), so list and map values can be
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specified via this flag.
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* `-var-file=foo` - Set variables in the Terraform configuration from
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a [variable file](/docs/configuration/variables.html#variable-files). If
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a `terraform.tfvars` or any `.auto.tfvars` files are present in the current
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directory, they will be automatically loaded. `terraform.tfvars` is loaded
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first and the `.auto.tfvars` files after in alphabetical order. Any files
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specified by `-var-file` override any values set automatically from files in
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the working directory. This flag can be used multiple times.
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## Resource Targeting
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The `-target` option can be used to focus Terraform's attention on only a
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subset of resources.
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[Resource Address](/docs/internals/resource-addressing.html) syntax is used
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to specify the constraint. The resource address is interpreted as follows:
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* If the given address has a _resource spec_, only the specified resource
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is targeted. If the named resource uses `count` and no explicit index
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is specified in the address (i.e. aws_instance.example[3]), all of the instances sharing the given
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resource name are targeted.
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* If the given address _does not_ have a resource spec, and instead just
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specifies a module path, the target applies to all resources in the
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specified module _and_ all of the descendent modules of the specified
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module.
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This targeting capability is provided for exceptional circumstances, such
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as recovering from mistakes or working around Terraform limitations. It
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is *not recommended* to use `-target` for routine operations, since this can
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lead to undetected configuration drift and confusion about how the true state
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of resources relates to configuration.
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Instead of using `-target` as a means to operate on isolated portions of very
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large configurations, prefer instead to break large configurations into
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several smaller configurations that can each be independently applied.
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[Data sources](/docs/configuration/data-sources.html) can be used to access
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information about resources created in other configurations, allowing
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a complex system architecture to be broken down into more manageable parts
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that can be updated independently.
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## Security Warning
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Saved plan files (with the `-out` flag) encode the configuration,
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state, diff, and _variables_. Variables are often used to store secrets.
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Therefore, the plan file can potentially store secrets.
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Terraform itself does not encrypt the plan file. It is highly
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recommended to encrypt the plan file if you intend to transfer it
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or keep it at rest for an extended period of time.
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Future versions of Terraform will make plan files more
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secure.
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