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| layout | page_title | sidebar_current | description |
|---|---|---|---|
| docs | Configuring Terraform | docs-conf-old-terraform | The `terraform` configuration section is used to configure Terraform itself, such as requiring a minimum Terraform version to execute a configuration. |
Terraform Configuration
The terraform configuration section is used to configure Terraform itself,
such as requiring a minimum Terraform version to execute a configuration.
This page assumes you're familiar with the configuration syntax already.
Example
Terraform configuration looks like the following:
terraform {
required_version = "> 0.7.0"
}
Description
The terraform block configures the behavior of Terraform itself.
The currently only allowed configurations within this block are
required_version and backend.
required_version specifies a set of version constraints
that must be met to perform operations on this configuration. If the
running Terraform version doesn't meet these constraints, an error
is shown. See the section below dedicated to this option.
See backends for more detail on the backend
configuration.
No value within the terraform block can use interpolations. The
terraform block is loaded very early in the execution of Terraform
and interpolations are not yet available.
Specifying a Required Terraform Version
The required_version setting can be used to require a specific version
of Terraform. If the running version of Terraform doesn't match the
constraints specified, Terraform will show an error and exit.
When modules are used, all Terraform
version requirements specified by the complete module tree must be
satisified. This means that the required_version setting can be used
by a module to require that all consumers of a module also use a specific
version.
The value of this configuration is a comma-separated list of constraints.
A constraint is an operator followed by a version, such as > 0.7.0.
Constraints support the following operations:
-
=(or no operator): exact version equality -
!=: version not equal -
>,>=,<,<=: version comparison, where "greater than" is a larger version number -
~>: pessimistic constraint operator. Example: for~> 0.9, this means>= 0.9, < 1.0. Example: for~> 0.8.4, this means>= 0.8.4, < 0.9
For modules, a minimum version is recommended, such as > 0.8.0. This
minimum version ensures that a module operates as expected, but gives
the consumer flexibility to use newer versions.
Syntax
The full syntax is:
terraform {
required_version = VALUE
}