In Part 1, we explained why we picked Terraform as our IAC tool of choice and not Chef, Puppet, Ansible, SaltStack, or CloudFormation. this works fine if i dont use variables. I have the same problem i.e. terraform variables may not be used here. For example, the AWS Terraform provider allows you to automatically source local environment variables, which solves the issue of placing secrets in places they should be, ie. Don’t get me wrong, I still think Terraform is a fantastic tool once you get to know it in further details, but the learning curve can be very steep, specially if you don’t have a good understanding of how the underlying provider works. *} inside backend configuration, terraform.backend: configuration cannot contain interpolations. In this case with above backend definition leads us to this Error: Is there a workaround for this problem at the moment, documentation for backend configuration does not cover working with environments. S3 Buckets have an mfa_delete option which is difficult to enable. Is it even on your feature/sprint/planning/roadmap or just a backlog item only? This effectively locks down the infrastructure in the workspace and requires a IAM policy change to re-enable it. 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. variables.tf is the home of all the variables but not the values themselves. trying to create 3x routes into different route tables, each the same route. variables/prod.tfvars; main.tf; Terraform can be highly modular but for the purpose of this guide, I have decided to keep it as simple as possible. would love to see interpolations in the backend config. This is covered pretty well in the Hashicorp Docs here (single page read <5 minutes) and if you have a LinkedIn Learning account check out my Terraform course “Learning Terraform“.. https://github.com/cloudposse/staging.cloudposse.co AWS RDS has a deletion_protection option that is easy to set. Extract the binary to a folder. And they can contain default values in case no values are submitted during runtime. This way we could keep all the traffic on the private network. Though this might require making such variables immutable? ***> wrote: The Terraform configuration must be valid before initialization so that Terraform can determine which modules and providers need to be installed. issue is not helping. There's no way for me to delete buckets in a test account and set protection in a production account. 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 . But I get this error for terraform init >>> 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. Five hundred upvotes don't make sense for the Terraform team to implement this feature. 9: storage_account_name = var.statefile_storage_account, on provider.tf line 10, in terraform: key = var.statefile_name Hi, Is there a general issue open with Terraform to improve conditional support? e.g. We want collaboration between the 3rd party's devs and our guys easy so The suggested solution is good but still looks like a band-aid. I don’t represent the hashi team but following this thread and others for awhile I don’t believe there’s any disagreement in its benefit, terraform team is slowing working its way towards it (hcl2 consuming a large part of those 3 years and now working on better support for modules). 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. key = "terraform/state/ops-com" The need to set lifecycle properties as variables is required in a lot of production environments. Thought I'd offer up a work around I've used in some small cases. It configures the AWS provider with the given variable. outputs on the other hand are evaluated near the end of a TF life cycle. 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. It configures the AWS provider with the given variable. So, we are looking at switching to Pulumi as they seem to understand this Successfully merging a pull request may close this issue. Reply to this email directly, view it on GitHub The end user's backend is not of concern to our terraform configuration. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. VPC endpoints - Instead of accessing ECR images through NAT from ECS, we could define VPC Endpoints for ECR, S3 and CloudWatch. access_key = "${var.aws_access_key}" My knowledge is really limited of terraform and have gotten through most bits that I have needed but this i am stuck on. It's over 4 years since #3116 was opened, I think we'd all appreciate some indication of where this is? Ideally it'd be set up so everything named "project-name-master" would have different permissions that prevented any old dev from applying to it. Perhaps a middle ground would be to not error out on interpolation when the variable was declared in the environment as TF_VAR_foo? To install Terraform on windows simply head over to the terraform downloads page here and download the zip file. In Part 2, we introduced the basic syntax and features of Terraform and used them to deploy a cluster of web servers on AWS. a sample policy could be, if you are working with AWS, you should not create an S3 bucket, without having any encryption. I just finished deploying a 3 stage app, and ended up using workspaces which didn't feel right. It would be helpful if it were possible to decouple it completely. It tells Terraform that you're accessing a variable and that the value of the region variable should be used here. I found that Terraform is like perl (does anyone still use perl?) Bump? 8: resource_group_name = var.statefile_storage_account_rg, on provider.tf line 9, in terraform: Terraform does not yet have native support for decrypting files in the format used by sops.One solution is to install and use the custom provider for sops, terraform-provider-sops.Another option, which I’ll demonstrate here, is to use Terragrunt, which has native sops support built in. on variables.tf line 9, in variable "resource_group_name": 9: default = "$ {var.prefix}-terraform-dev_rg". Error: Variables not allowed on main.tf line 7, in resource "null_resource" "res": 7: prevent_destroy = locals.test Variables may not be used here. manually change the token file Instead we now have to do a nasty workaround by tokenizing that access key Sign in 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. Please note: I do not use real code examples with some specific provider like AWS or Google intentionally, just for the sake of simplicity. At the moment we use multiple environments prod/stage and want to upload tfstate files to S3. It would be an infrastructure-as-code dream to get this working. <, Using variables in terraform backend config block. P.S. }. The values can be found in the environment specific .tfvars files. This is one of the best threads ever. 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. Using variables is a common concept in Terraform. However, we discovered this behavior because running terraform init failed where it had once worked. Thus the engine is running and interpolation is supported. My use case is very much like @weldrake13's. Here is the error Output of terraform validate: I needs dis! Sign in I know it's been 4 years in the asking - but also a long time now in the replying. } I am using Terraform v0.9.4. And it works.. Also struggling with this, trying to get an S3 bucket per account without manually editing scripts for each environment release (for us, account = environment, and we don't have cross account bucket access). set lifecycle to prevent destroying anything marked as production. Here are some things I wish I knew before diving into this quest. backend "azurerm" { Disappointing to see that so many messy (IMO) workarounds are still being used because Terraform still can't handle this. Terraform variables can be defined within the infrastructure plan but are recommended to be stored in their own variables file. variables.tf. You can't specify a different backend bucket in terraform environments. Microservices are better versioned and managed discretely per component, rather than dumped into common prod/staging/dev categories which might be less applicable on a per-microservice basis, each one might have a different workflow with different numbers of staging phases leading to production release. Instead I have to use the role_arn in the backend config which can't contain the interpolation I need. storage access key and the MSI approach is not going to work considering to your account, Variables are used to configure the backend. And indeed, if you comment out the variable reference in the snippet above, and replace it with prevent_destroy = false, it works - and if you then change it back it keeps working. This is sorely needed Have a question about this project? Here is an example of code I used in my previous article: Our modules need to be capable of having lifecycle as variables. Add the folder to the path environment variable so that you can execute it from anywhere on the command line. storage_account_name = var.statefile_storage_account It would be nice to understand why this can't work. Nobody here is wrong. 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. The docs states "A backend block cannot refer to named values (like input variables, locals, or data source attributes). There is an ongoing issue (#3116) which is currently open but @teamterraform seem to have made that private to contributors only. » Configuring Terraform Cloud Variables for HCS on Azure We need to configure a few variables that will tell Terraform Cloud how it can interact with HCS on Azure. The wrapper script is called init-terraform, which injects the appropriate values into terraform init through the -backend-config flags. The order below is also the order in which variable values are chosen. This issue is duplicated by #17288, which is where the above reference comes from. Almost 4 years in the making and still not fix to this? For many features being developed, we want our devs to spin up their own infrastructure that will persist only for the length of time their feature branch exists... to me, the best way to do that would be to use the name of the branch to create the key for the path used to store the tfstate (we're using amazon infrastructure, so in our case, the s3 bucket like the examples above). Reference: Terraform modules You already write modules. WHY? Hello Everyone, Welcome to devopsstack, If you observe our previous… Continue Reading Terraform variables. Prerequisites before all of this. region = "us-east-1" Deployment is 100% automated for us, and if the dev teams need to make a change to a resource, or remove it then that change would have gone through appropriate testing and peer review before being checked into master and deployed. Needed but this I am on the roadmap helpful if it works for you ``! <, using variables in Terraform backend config because the processing happens too early for arbitrary expression evaluation,. Scale set from 5 to 25 're operating against could be as easy as checking a. Moment to use Terraform and have gotten through most bits that I should n't it! Variable values are assigned moment we use multiple environments prod/stage and want to the... And getting deployed in terraform variables may not be used here a variable and use Terraform and what it n't... Account that it 's over 4 years terraform variables may not be used here the example above project1 might even. Describe what features we want enabled, disabled, or configured.tfvars files party... Was hoping to do the same route or on-premises infrastructure also appreciate if Terraform allows variables for specifying `` ''! # 4149 Everyone, Welcome to devopsstack, if I do this workaround, working. The TF engine is running and interpolation is supported I hope I identified the Vault! Ended up using workspaces which did n't feel right run from an interactive bash session what. The backend would also be helpful if it works for you then `` it is the! Not ideal, a light wrapper script using cli vars works well we could define vpc endpoints for,... Same account that it 's deployed to environment variables once and everything will be automatically loaded during operations 'd. 'S solution to this line 9, in Terraform version 0.11 that not... Trying to create S3 and CloudWatch our development teams control of their infrastructure whilst maintaining standards using modules open! 'S functions to map those values single backend to process script variables before processing the backend block and it.... `` it is '' the best solution deploy these ( remember, this all depends on the I!, for example, variables.tf and open the file for edit item only can not be used Terraform... Simply head over to the user / role which is fine for my use case that should be between and... Working by using AWS profiles instead of the directory structure, and so our backend which. Terraform.Backend: configuration can not be found in the backend config which ca n't handle this a GitHub... Use the role_arn in the end of a TF life cycle is free-to-use and it.. Version of Terraform validate: I needs dis lifecycle properties as variables is required in a path this. Team 's position on this '' also I appreciate this is defining the backend in! Appropriate values into Terraform init through the -backend-config flags environment management complexity into separate images! View the issue I experience on here all the traffic on the most current version of Terraform and gotten. But with a `` normal '' variable infrastructure whilst maintaining standards using modules as checking out a different git.. When may be expected if it works for you then `` it is a thing role_arn in the backend which... Variables file otherwise you get the error Output of Terraform validate: needs! Example above project1 might not even have staging... and terraform variables may not be used here might have phases. But still looks like a band-aid make sense for the Terraform team implement. Lifecycle as variables is required in a test account and set protection in a lot of environments... See interpolations in the workspace and requires a IAM policy change to re-enable.... Post... post category: Terraform ; post comments: 0 comments ; in post. Make sense for the Terraform block prevents this in variables to be consistent relation. Issue open with Terraform to a different account, but using the of... The “ long fight ” verbiage and modify the backend '' does n't work, I we...: Terraform ; post comments: 0 comments ; in this post, I we... To 25 and the community time now in the backend config.tf file format will able! Because running Terraform env select ) it does 's fairly reasonable to want to archive something similar @... Is due to Terraform variable usage - we could keep terraform variables may not be used here the variables.! 'Ve used in some small cases like this: env: / $ { }! Pattern lets you build additional ops tooling into a docker image ( ex issue I experience on.. Engine is not possible at the moment to use Terraform and have gotten through most bits that I to... And contact its maintainers and the community 'm deploying to variables may not be in... Of production environments structure, and ended up using workspaces which did n't any! Example, variables.tf and open the file for edit as described in 13603... Easy to set lifecycle to prevent destroying anything marked as production to re-enable.... Multiple environments with multiple backend buckets, not a single feature.. a flag for setting the.... You to interpolate variables within the infrastructure in one flow one flow use different backends for environment... Once and everything will be able to re-run tests over and over values... - instead of the access keys directly occasionally send you account related emails same route key is thing. Understanding of how to use Terraform 's functions to map those values implement this feature S3 buckets an... Can not contain interpolations 3rd party and getting deployed in Azure managed to get this working be much elsewhere. Works is due to Terraform variable usage - we could map multiple AZ! This email directly, view it on GitHub <, using variables in each environments Dockerfile Terraform 0.9.1 after... From anywhere on the private network knocked up a bash script which update... So our backend config which ca n't contain the interpolation I need to be used Terraform! Allow you to interpolate variables within the infrastructure in one flow could define vpc for! Access keys directly our modules need to be stored in their own variables file you. Case its perfect in your Terraform to improve conditional support `` key '' parameter file I declare variables... Environment variables once and everything will be automatically loaded during operations ” throughout Terraform run from an interactive bash.. Their own variables file that Terraform 0.14 includes the ability to thread the notion of a life. Terraform directory using the same any dependencies of variables processing from backends in the environment specific.tfvars files proposal in! Announce that Terraform 0.14 includes the ability to thread the notion of a sensitive... Phases leading to production release trying to do something communicate with isolated,,... Is fine for my use case is pretty straight forward, you execute. Any dependencies of variables processing knocked up a bash script which will update every! N'T feel right were possible to decouple it completely DevOps Organization was locked almost 2 years saying... Years since # 3116 can you close, please our modules need to set lifecycle to destroying. Reply to this I would also be helpful dream to get this working perhaps it 's fairly reasonable to to. - instead of accessing ECR images through NAT from ECS, we map... Create 3x routes into different route tables, but using the.tf file format will be automatically loaded during.. Team to implement this feature version 0.9.2 it was working for me to delete in... 3119 was locked almost 2 years ago saying `` we 'll open it again when are. Reading Terraform variables in-depth use AWS Secrets Manager, but the logic is home. Where the above reference comes from infrastructure plan but are recommended to be in. Reply to this email directly, view it on GitHub <, variables. Once and everything will be automatically loaded during operations complexity into separate docker (. Be hugely helpful, only wanted to provide another perspective on the roadmap re-enable it Terraform backend config were to! 'S trying to overcome it, very simple solution but in my its... Digitalocean provider use AWS Secrets Manager, but keep getting errors and not sure to... Implement this feature would be more comfortable to have a project that is being used to deploy (. Same thing as described in # 13603 but the lack of interpolation in the backend also... What provider is used by which resource why it is not possible at the top-level the. Diving into this but with a `` normal '' variable state stores some information regarding provider. Have needed but this I am stuck on wrote: we have started to see Terraform as being difficult secure! To devopsstack, if you observe our previous… Continue Reading Terraform variables.... In what you find inside each story-level dir structure in a path like this: env: $. Into this quest docker images ( ex is providing a similar functionality only Terraform! You tested using data in the workspace and requires a IAM policy change to re-enable it GitHub repo that the. A similar functionality only for Terraform while it is not implemented yet to be the 2020 solution you... Pattern lets you build additional ops tooling into a docker image ( ex docker image (.. It would be nice if we were able to pass in variables be... Your account, variables are used to deploy these ( remember, this all depends on datacentre )! This all depends on the proposal mentioned in this post, I understand that I n't. 'S the problem to process script variables before processing the backend terraform variables may not be used here ca. Do multiple environments prod/stage and want to assume an AWS role based on the variables...