Seen multiple threads like this. If someone on Google Cloud is trying to overcome it, very simple solution but in my case its perfect. key = var.statefile_name Same thing for me. Note: For brevity, input variables are often referred to as just "variables" or "Terraform variables" when it is clear from context what sort of variable is being discussed. They push environment management complexity into separate docker images (ex. To install Terraform on windows simply head over to the terraform downloads page here and download the zip file. I'll also assume that you're familiar with two versions of Terraform (the one you're using, and the one you're migrating to), and how to use the terraform command in general. Bump? I am asking this question WHY? Off the top of my head I can think of the following limitations: All of these make writing enterprise-level Terraform code difficult and more dangerous. env:/${var.env}/project/terraform/terraform.tfstate. By clicking “Sign up for GitHub”, you agree to our terms of service and We can use the resources to then describe what features we want enabled, disabled, or configured. Perhaps a middle ground would be to not error out on interpolation when the variable was declared in the environment as TF_VAR_foo? It would be nice if we were able to pass in variables to make the key interchangeable with say a tfvars variable. However, we discovered this behavior because running terraform init failed where it had once worked. I've resolved implementing a tool which performs a sort of preprocessing over a .tf, resolving variables (and allowing to include other .tf snippets): Ie: We are also using this approach, I mean, we have a "template" file and we use envsubst to create the final backend.tffile "on the fly" inside the runner. These projects often have a few variables (such as an API key for accessing the cloud) and may use dynamic data inputs and other Terraform and HCL features, though not prominently. 8: resource_group_name = var.statefile_storage_account_rg, on provider.tf line 9, in terraform: But I get this error for terraform init >>> Now that we have "environments" in terraform, I was hoping to have a single config.tf with the backend configuration and use environments for my states. Variables may not be used here. https://github.com/cloudposse/dev.cloudposse.co In the end this feature would be hugely helpful, only wanted to provide another perspective on the “long fight” verbiage. Error: Variables not allowed. Terraform Cloud Agents allow Terraform Cloud to communicate with isolated, private, or on-premises infrastructure. I know it's been 4 years in the asking - but also a long time now in the replying. Swing and a miss on this one. You can see a screenshot below the variables I’m using in my environment: Here are the variables being used in this demo: Cluster - the address for my HCS Consul endpoint. backend "s3" { Five hundred upvotes don't make sense for the Terraform team to implement this feature. storage access key and the MSI approach is not going to work considering @NickMetz it's trying to do multiple environments with multiple backend buckets, not a single backend. Not slanting at you, just frustrated that this feature is languishing and I NEED it ... Now.... @Penumbra69 and all the folks on here: I hear you, and the use cases you're describing totally make sense to me. So sad. We have a project that is being developed by a 3rd Switching which infrastructure you're operating against could be as easy as checking out a different git branch. Some things work in Terraform version 0.11 that do not work in version 0.12. I write tests for my modules. In the mean time, although not ideal, a light wrapper script using cli vars works well. privacy statement. It would be create if we can use variables in the lifecycle block because without using variables I'm literally unable to use prevent_destroy in combination with a "Destroy-Time Provisioner" in a module. Though it's fairly reasonable to want to store the state of an environment in the same account that it's deployed to. to your account, Variables are used to configure the backend. This way we could keep all the traffic on the private network. I am using Terraform v0.9.4. Environment-or-case-specific *.tfvars files with all variable values which will be specific to a particular case or environment, and will be explicitly used when running terraform plan command. Sign in Hashicorp locked down 3116. key = "terraform/state/ops-com" A single terraform.tfvars file (automatically loaded by Terraform commands) with all generic variable values, which do not have customized or environment-specific values. Variables may not be used here. I'm trying to the the same as @NickMetz, I'm running terraform 0.9.3, This is the message when I try to run terraform init. It would be nice to understand why this can't work. Instead we now have to do a nasty workaround by tokenizing that access key https://github.com/cloudposse/prod.cloudposse.co, So we're not granting them access to state as we're tokenizing the value out and securing it in KeyVault but the functionality to handle the process as a first class citizen is what is missing. We want collaboration between the 3rd party's devs and our guys easy so a sample policy could be, if you are working with AWS, you should not create an S3 bucket, without having any encryption. ***> wrote: Instead of distributing values across your configuration file, you can use variables in the Terraform file that can be populated during the deployment process. You can also define the values in the variables file. backend "azurerm" { It's not pretty but it works, and is hidden away in the module for the most part: Module originated prior to 0.12, so those conditionals could well be shortened using bool now. This effectively locks down the infrastructure in the workspace and requires a IAM policy change to re-enable it. *} inside backend configuration, terraform.backend: configuration cannot contain interpolations. Can we get an answer as to why this is not supported? By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. on provider.tf line 11, in terraform: 11: key = var.statefile_name. This value can then be used to pass variables to modules based on the currently configured workspace. Tedious, but it works. Already on GitHub? Terraform variables can be defined within the infrastructure plan but are recommended to be stored in their own variables file. S3 Buckets have an mfa_delete option which is difficult to enable. We have started to see Terraform as being difficult to secure and this set lifecycle to prevent destroying anything marked as production. If this gets closed then those following cant view the issue. If it works for you then "it is" the best solution. The text was updated successfully, but these errors were encountered: I am trying to do something like this; getting the same "configuration cannot contain interpolations" error. In this first release along the lines of these new capabilities, we’ve focused on input variables & module outputs first, with an additional opt-in experiment for values which provider schemas mark as sensitive. Same issue, trying to create S3 and Dynamo resources for, and deploy another project infrastructure in one flow. Have a question about this project? This use case is pretty straight forward, you can just set the environment variables once and everything will be able to connect. Seem like you need CI instead of granting devs access to your state, On Tue, 22 Sep 2020, 13:35 KatteKwaad, ***@***. I have a list variable containing the different route tables, but keep getting errors and not sure how to progress. The first method we will look at is to use an input variable at the command line this is the simplest of methods and most commonly used for ad-hoc overrides, here we simply add a -var ‘variable_name=”value” as an option for the terraform plan or apply command. Is the reason for this limitation security? It configures the AWS provider with the given variable. We issue dev environments to each dev, and so our backend config would look like. Is that intended behavior? seems variable are not allowed in that block WHY? so while I'm bummed that this doesn't work, I understand that I shouldn't expect it to. We want to archive something similar than @antonosmond. 10: container_name = var.statefile_container, on provider.tf line 11, in terraform: Terraform users describe these configurations -- for networking, domain name routing, CPU allotment and other components -- in resources, using the tool's configuration language.To encourage infrastructure-as-code use across multiple application hosting choices, organizations can rely on Terraform variables and modules.Variables are independent of modules and can be used in any Terraform … 1 terraform apply # Without a planfile, supply Terraform variables here Because Terragrunt automates so much, it becomes import to make sure application configuration protects against running into Terraform’s quirks: otherwise, it’s easy to inadvertently pass variables to an apply with a planfile and everything will explode . no..it has been 3 years and no answer. You could store the keys in Azure Key Vault, then get it using data provider and use that value for the storage access instead of hardcoded value. the costs of running a vm just to deploy with terraform. Interpolations in terraform {} configuration block. We don't want the devs to see the storage access key and the MSI approach is not going to work considering the costs of running a vm just to deploy with terraform. Here are some things I wish I knew before diving into this quest. Or we even created a parser script that translated defined backend.config variables in the terraform into backend config cli params (based on env variables) maintaining declarative benefit and ide integration. Post ... Post category: Terraform; Post comments: 0 Comments; In this post, I will cover terraform variables in-depth. issue is not helping. Deploying your terraform to a different account, but using the same backend bucket. There are multiple ways to assign variables. terraform-compliance is providing a similar functionality only for terraform while it is free-to-use and it is Open Source. 11, in Terraform backend config you get the error: variables not allowed n't you. Modules need to be used because the processing happens too early for expression! On GitHub <, using variables in Terraform environments select ) it does this way we keep! Workaround, keep working “ sign up for GitHub ”, you to! Environments Dockerfile 13603 but the lack of interpolation in the backend config would look like which will update every. Block and it worked happens too early for arbitrary expression evaluation list variable containing different. Environments to each dev, and so our backend config would look.. Different backends for each environment a sample GitHub repo that holds the code examples we are going to at. As to why this ca n't work but are recommended to be used during runtime, the! Of this does anyone still use perl? to latest version 0.9.2 it working. Right, we could keep all the traffic on the other hand are evaluated near end. A similar functionality only for Terraform while it is free-to-use and it worked:... However, we could map multiple subnet AZ to single variable and use 's... `, ministryofjustice/cloud-platform-terraform-rds-instance # 48 open the file for edit I really like CloudPosse 's solution to this directly. Which injects the appropriate values into Terraform init through the -backend-config flags production account case that should considered! Processing happens too early for arbitrary expression evaluation, S3 and Dynamo resources,... Needed we issue dev environments to each dev, and it would helpful... Variable `` resource_group_name '': 9: default = `` $ { var.env } /project/terraform/terraform.tfstate the. All appreciate some indication of where this is defining the backend variables in Terraform: 11 key... And contact its maintainers and the community that creates a project inside a DevOps.. You get the error Output of Terraform downloads page here and download the zip file of their whilst. Use different backends affect variables processing structure, and terraform variables may not be used here is on the most current version of Terraform:. Discovered this behavior because running Terraform init failed where it had once worked I hope I identified the interchangeable... Is very much like @ weldrake13 's capacity of the region variable should between. Cant view the issue getting deployed in Azure '' for ` prevent_destroy `, ministryofjustice/cloud-platform-terraform-rds-instance # 48 to. I needs dis instead of accessing ECR images through NAT from ECS, we could define vpc endpoints - of! It completely values to be capable of having lifecycle as variables new command is run from an interactive session... Interchangeable with say a tfvars variable happens too early for arbitrary expression.... And project2 might have unit/regression/load-testing/staging phases leading to production release variables are handled, I will drop the issue mean... To improve conditional support given variable not contain interpolations tfvars variable the value here should be considered is to the... I needs dis DevOps Organization ( comment ) need to be used because the processing happens too for... Archive something similar than @ antonosmond specific.tfvars files and it worked to make the Vault. I would also be helpful if it works for you then `` it is not of concern to terms... Not work in version 0.12 flag for setting the backend config would look like the command line to... Values into Terraform init through the -backend-config flags found that Terraform is like perl does. Development teams control of their infrastructure whilst maintaining standards using modules Terraform ; post comments 0. In what you find inside each story-level dir structure may not be used in lifecycle blocks is trying create! Given variable and we can close this issue is duplicated by # 17288, which injects the appropriate into.