I was wondering if it's possible to grab different data dynamically based on variables like so
data.terraform_remote_state.vm.outputs.vm_***var.vmname***
Or something similar? i dont have the option to redesign the outputs currently, and this would greatly lower the chance of making failure upon creating new terraform deployments
thanks!
There are Input Variables available in Terraform. These variables allow you to define inputs expected at the time of terraform apply. The values may be entered via an interactive terminal or provided in a .tfvars file.
variable "vmname" {
type = string
description = "The name of the virtual machine."
}
Then you can use them by expansion:
"data.terraform_remote_state.vm.outputs.vm_${var.vmname}"
For additional reference, see https://www.terraform.io/docs/language/values/variables.html
Related
I currently have a dev.auto.tfavrs file with a few dozen variables and their values for my application such as:
DB_NUM_RECORDS_PER_EXECUTION = "Something here"
QUEUE_API_KEY = "Something here"
application = "My Appplication"
Application_Secret_Key = "Some Secret Key here"
All variables are defined in a variables.tf file, with the sensitive ones assigned a blank value.
I run terraform plan in this manner:
terraform apply -var-file=env/dev.auto.tfvars
(I have also qa.auto.tfvars and prod.auto.tfvars for the other environments)
I want to inject certain sensitive values to certain keys such as :
Application_Secret_Key via The Terraform Cloud Variable sets so developers don't have to.
I have added Application_Secret_Key in the TF Cloud Variable set.
but when i run the above terraform plan, Terraform Cloud is not injecting the value stored in the variable set...instead it assigns the blank value as defined in my configuration.
It is my understanding that the auto.tfvars files take precedence and over write the terraform.tfavars file in Terraform Cloud. Hence the sensitive values are Blank
I do not want to add dozens of variables in the TF Cloud Variable set...only certain sensitive ones.
Is this possible?
Thanks in advance
Is there a way to render the values of Local Values and Variables? As an example, I have this file
variable "foo" {
type = string
default = "bar"
}
locals {
my_var = "here is ${var.foo}"
}
# Rendered:
# my_var = "here is bar"
Is there a quick and easy way to do it? I've tried terraform console but it's hard to use it with complicated use-cases, such as templatefile, jsonencode, jsondecode, merge and the list goes on and on.
I need this capability to test functions that I'm not yet familiar with. Doing terraform apply for just checking how my functions are working is something that I'm trying to avoid.
I needed something like https://www.katacoda.com/courses/terraform/playground but for local usage with fast results.
I created this project - https://github.com/unfor19/tfcoding - which brings up a Docker container that watches for changes in the file tfcoding.tf and renders the Local Values automatically upon saving this file.
Demo:
I have below variables.
variable value
stage dev
admin $($(stage)-admindata)
dev-admindata 4000
But these multiple substitutions are not working for variable admin.
Please let me know how to solve this.
admin values should be 4000 when I use it in yaml or in json file, Currently I am getting $(dev-admindata)
At this moment, the value of nested variables (like $($(stage)-admindata)) are not yet supported in the build/release pipelines.
If you want to give different values to the admin variable depending on the value of stage varibale. As a work around you can write a script in the powershell task to judge, e.g. If the value of the stage variable is dev, then assign the value of the dev-admindata variable to the admin variable.
if ($(stage) -eq "dev"){
$admin = $(dev-admindata)
}
else{
xxxxx
}
For the similar issue ,you can refer to this case.
I've deployed my infra using Terraform and I noticed that I have some interesting information in the state (terraform.tfstate) file of terraform which I would like to extract. For example
$ terraform state show 'packet_device.worker'
id = 6015bg2b-b8c4-4925-aad2-f0671d5d3b13
billing_cycle = hourly
created = 2015-12-17T00:06:56Z
facility = ewr1
...
which I would like to transform somehow to
$ terraform state show 'packet_device.worker.id'
6015bg2b-b8c4-4925-aad2-f0671d5d3b13
But adding the id at the end doesn't seem to work. Any suggestions how I can achieve this behaviour?
Terraform state show command is used to retrieve all the attributes of a given resource and you won't be able to fetch a single attribute from it as the argument is resource ADDRESS and is used to refer a resource specifically. Documented in https://www.terraform.io/docs/internals/resource-addressing.html
What you can do is store the resource attribute in output value and use the command
terraform output {output-valaue-extractor}
Refer: https://www.terraform.io/docs/configuration/outputs.html
You can utilize terraform show -json and jq to get a specific value out of a Terraform state file.
terraform show -json <state_file> | jq '.values.root_module.resources[] | select(.address=="<terraform_resource_name>") | .values.<property_name>'
You have a state file named terraform.tfstate and a Terraform resource as packet_device.worker and you want to get id. Then it would be as follows:
terraform show -json terraform.tfstate | jq '.values.root_module.resources[] | select(.address=="packet_device.worker") | .values.id'
terraform.tfstate also can be omitted since it is a default name for a state file.
The primary way to export information from a Terraform configuration is to declare Output Values in your root module. You can then access them using terraform output once the apply has completed. If you need that information in a machine-readable way, you can alternatively run terraform output -json from the consuming program and parse the output as JSON.
If you are in an unusual situation where you need programmatic access to all values in the state (for example, if you were implementing some sort of generic Terraform state visualization tool) then you can instead use terraform show -json, which will print out all of the data from the state in a JSON format.
If you are accessing only specific values, perhaps to integrate with some other system in an automation solution, I'd recommend using explicit Output Values because then it's explicit to future maintainers what the interface with the caller is, and so they are less likely to accidentally break the caller by e.g. refactoring the packet_device.worker resource into a child module, which would cause it to appear in a different place in the state. The usual assumption is that the resources inside a module are an implementation detail of that module and thus that you can safely refactor them as needed as long as the output values remain unchanged.
If you want to get the exact value and are willing to install jq, the other answers here are great!
If you're looking for a quick answer to manually copy/paste, etc., piping to grep does the trick.
ex:
terraform state show 'packet_device.worker' | grep "id"
which would show the relevant line(s), like:
id = 6015bg2b-b8c4-4925-aad2-f0671d5d3b13
Is there a way I can input variable values from outside to terraform main file. It can be a excel sheet or sql db. Is it possible to do so ?
What you can't currently do is point you cmdline at a db i.e. to replace a tfvars file, but what you can set up in Terraform is to use a number of different key value stores:
consul
https://www.terraform.io/intro/examples/consul.html
aws parameter store (using a resource or data)
https://www.terraform.io/docs/providers/aws/d/ssm_parameter.html
There are quite a number of other key/value stores to choose from but there's no zero code solution and you will end up with lots of these statements:
Setup a key in Consul to provide inputs
data "consul_keys" "input" {
key {
name = "size"
path = "tf_test/size"
default = "m1.small"
}
}
There are many ways to do that;
You can use a tfvars file with all your inputs and you can use one file customer, user, environment
You can pass the variables to terraform executable on the command line
You can define environment files prefixed wit TF_VAR_[variable]
You can use https://www.terraform.io/docs/providers/aws/d/ssm_parameter.html as suggested above
You can even store variables in DynamoDB or any other database
You can use Consult+Vault as well