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