Terraform locals map The variables represent the AMI ID (ami), Instance type (type), Subnet Id (subnet), Network Interface (nic) and Tags (tags) to be assigned for the given EC2 instance. As suggested in the comments, you can re-organize your local. It is used to store related data and write reusable code, making it easier to manage Terraform configurations. Types. 220. name], [for m in local. Follow edited Dec 1, 2018 at 18:34. # Define the common tags for all resources locals { common_tags = { Component = "awesome-app" Environment = "production" } } # Create a resource that blends the common tags Is there a way to conditionally add values to a map based on the is_needed boolean? For example, I can create a map with all of the values like this: locals { map_of_values = tomap({ for instance in module. HashiTalks 2025 Learn about unique use cases, homelab setups, and best practices at scale at our 24-hour virtual knowledge sharing event. Terraform doesn’t directly support merging lists of objects using the merge function, but there are effective workarounds to achieve this. 12, so any solution needs to work with 1. Product. Handling list Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company The closest thing in Today's Terraform is to have your callers set the attribute value to null and then handle that null somehow inside your module. Commented Sep 30, 2020 at 9:19. The [. If you want the list of values of prod_cidrs then you can just use the values function. code]list[. I would like to take the dynamic configuration and insert 2 different values to this section. In your case, that In the same folder launch terraform console for testing built-in functions. create_user == true ] list_of_buckets = [ for bucket in var. tfvars file, but will take precedence over it. Terraform issues when using for_each local variable created based on another local. Pre Processing Terraform Locals. code]string[. Instead of focusing solely on environments, we explore scenarios Terraform Locals are named values which can be assigned and used in your code. Note that remote APIs may have a different definition of "character" for the purpose of length limits on string arguments; a Terraform provider is responsible for translating Terraform's string representation into that used by its respective remote system and applying any additional validation rules to it. The kubernetes_config_map resource returns a resource_version attribute as part of the metadata. dev_cidrs output directly you will see that it's a map which is what allows you to select module. By using a combination of functions such as concat, for, and flatten, you can merge lists of objects dynamically and efficiently. The actual values can come from input variables, resource attributes, or other local values defined in Applying the above, you can verify that Terraform map nesting is now quite powerful and this makes a lot of things easier. See how local. Ask Question Asked 2 years, 10 months ago. The merge function doesn’t recursively collapse nested I have the following locals file. Improve this question. Skip to main content locals { parts_map = { # NB Location should always be last to ensure geo-separation of names prefix = [ local. Terraform For each loop on object and pass to child module. locals { tags = { Environment = "${var. The main requirement for for_each is that the map you provide must have one element per instance of the resource you want to create. I tried the following (var1 and 2 are both declared as maps): With. settings. Your approach did work! However, it only works when one instance is created per module. You probably want your Nevertheless, the problem is exactly as mentioned by Matt in the comment - maps in Terraform HCL don't support integer-indexing. But it seems Terraform map variable helps with managing your configuration using key-value pairs, allowing you to easily handle different environments or regions without repeating your code. terraform nested for loop from a map with a list within. However, some parts of Terraform v0. g. rtb-pub. Sometimes your input data structure isn't naturally in a suitable shape for use in a for_each argument, and flatten can be a useful helper function locals { y = { a-j { p0 = "j" p1 = "test-1" p2 = 0 } a-k { p0 = "k" p1 = "test-2" p2 = 0 } b-j { p0 = "j" p1 = "test-1" p2 = 1 } b-k { p0 = "k" p1 = "test-3" p2 = 0 } } } I have got this to work by converting everything to a list, flattening it, and using count, but I'd like to preserve the keys in case the order changes later down the line to The tomap function converts a value to a map. ), perform a specific operation, and return a result that can be used within your configuration. $ terraform import kubernetes So although this is JSON-style syntax, in Terraform terms it seems like what we have here is a list of maps of objects, and what we need is just a map of objects. I would like to access the keys within say demo map for e. This is the nearest what I have found - Map within a map in terraform variables where I can read the value in a nested map but I need to extract key also in my case. Custom functions can also be defined using Terraform modules or Is there a way to conditionally add values to a map based on the is_needed boolean? For example, I can create a map with all of the values like this: locals { map_of_values = tomap({ for instance in module. 10; v1. Terraform 0. I can get the entire value of the variable and set it but not sure what the next steps are to access the individual map values and create the local from that. But in this case I explicitly want to be able to have duplicate keys so that one module doesn't need to care about any of the other modules. A new version of Terraform was recently announced which should give the ability to do this, among many other HCL improvements. dynamodb_ec2_instance_info = { "i-087750beb58cb161b" = "54. Hot Network Questions hi @Marcin, indeed if I remove the secret using the module information it does work. locals {ingress_annotations_optional Maps, or key-value pairs in Terraform, play a crucial role in managing complex infrastructure deployments more effectively and efficiently. env[terraform. Maps, on the other hand, are collections of key-value pairs that provide a more descriptive way to organize and access data. code]map[. For my purposes I would like to create a list of maps which will look The zipmap function constructs a map from a list of keys and a corresponding list of values. large = 2 db. I would need to define both cost_center and is_enabled How to iterate through list of maps in terraform while creating locals? 2. code]object[. The variable, push_subscriptions, is a list of maps and I want to modify the values of the map. Here’s how simple lists and maps look in Terraform: locals { keys = ["key1 Recently, I was setting up a Kubernetes ingress using Terraform, and faced the case when based on an input variable I have to add a new annotation to the ingress configuration or not. x Compatibility Promises; Terraform Internals; Resources . I'd consider changing your YAML input to be variables = { "tenantsList" = "tenanta,tenantb", "unitName" = "canary" } so you can then access it as Merging Lists of Objects. I am trying to tag the docker swarm instances using terraform I defined variable and locals as variables. By understanding the strengths and limitations of variables and locals, you can write more maintainable and efficient Terraform configurations. xlarge = 4 db. The “*” is a placeholder for any name you want to use; using -var or -var-file when running terraform plan/apply/destroy. array. That’ll show up in the published documentation with the Locals can be assigned any valid Terraform data type, such as a string, list, map, or object. Use locals to assign expressions to variables for reuse, conditionals to declare if/then scenarios, and the splat expression to return attributes from Terraform code: locals { rds_instances_to_cpu_cores = { db. 85. Given the following two variables in terraform: variable "db_alarm_metrics" { type = map(any) description = "Database metrics to create alarms for" default = { " interpolated-only variable in 0. users. value }) } Can I create a map with only some of the values? Something akin to this pseudo-code: Terraform supports uppercase letters and dashes in identifiers only to make it more convenient to write names that will be sent to remote systems that may have different conventions. Let’s create a Terraform variable name cluster_tags for the tags in the variable We will name the converted variable value in this expression using the locals my_map and produce a map of objects by keeping the name as the unique value of input Terraform variables in the I have a terraform template that creates multiple EC2 instances. It is a viable alternative to HashiCorp’s Terraform, being forked from Terraform version 1. This resource allows Terraform to manage data within a pre-existing ConfigMap. How to merge/combine two variables in to one variable in terraform? Hot Network Questions Why does the Apple II have the VERIFY command in Reference map in locals in terraform file. The terraform way of doing this is by using local values or locals where you can somehow keep Locals can be assigned any valid Terraform data type, such as strings, lists, maps, or objects. . This resource uses field management and server-side apply to manage only the data that is defined in the Terraform configuration. context["stage"]]. To get a similar result with a map or object value you must use for expressions. Spacelift platform. Hot Network Questions The closest thing in Today's Terraform is to have your callers set the attribute value to null and then handle that null somehow inside your module. name}-${policy Parsing json in terraform locals. value]) Observe the output of each list-item-map being a name-value-pair of a single map: Goal: Be able to create and use locals to further abstract your data. You can use a for loop to exclude those blanks. Parsing json in terraform locals. var1 = "${local. key which returns "demo" and "prod". Explanation. The concat function will combine two or more lists into a single list. original_map : k => v }} Map Filtering: You can filter out certain elements from a map based on certain conditions, creating a new map with only the elements that meet the criteria. Maps of maps are a real pain in Terraform but there might be a much better way to do what you want using the aws_subnet_ids data source instead. tfvars ----- nacl=[ { "vpc_name" = "vpc1" " Skip to main content. In the aws_instance resource block, we used these variables to provide the appropriate values required for the given attribute. 4xlarge = 16 } } The above works fine in Terraform 0. tf) for better modularity. key => instance. shared_env: m. locals { filtered_instance_details = { for k, v in var. Even with the is_firewall set as "true" or "false" the outcome is the same. tf and locals. com" "location": "L1" "resource_group_name": "R1" First, you defined your variable to be of type list, but then you are passing a map to it (). flat_sandboxes looks like: How to iterate through list of maps in terraform while creating locals? 2. subnets_map. How do you define Terraform locals that include nested blocks. small; medium; large; And where the deployment uses much more technical terms to indicate the size. For_each loop with for expression based on value in map. I will be providing values with terragrunt. 11 how to remove a I am trying to create a map of secondary ranges for the GCP VPC module here and have the following defined in my locals: secondary_ranges = { for name, config in var. 1,940 1 1 gold Parsing json in terraform locals. xxx to use the xxx key and return its value. Examples of Terraform Locals. The defaults function does not work well for some use cases with collections of objects. It is of the form map(<TYPE>), The locals block in terraform is used to assign a name to an expression for reuse as many times as desired. By dynamically constructing maps in a locals block, Terraform empowers you to use variables as keys, unlocking greater flexibility in managing your infrastructure as code. About; Products Can you provide your locals block? Your main. 3 with the same map you used. Lists are ordered collections of values that can be of the same type, accessed by their index. We’ll call this list local. key => restr, this part means that it should return a new map with "test02" as key and the other elements as value. Is there a way to have a nested for loop without having to create a new variable in locals? Hot Network Questions locals { pets_map = { for i, pet in var. 12) Expected map to loop temple_list = { Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Your use of string values to represent boolean values is a little confusing here. x+ you can use a dynamic block to achieve this. The Terraform language uses the following types for its values: string: a sequence of Unicode characters representing some text, like "hello". Is there a way to have a nested for loop without having to create a new variable in locals? 4. aws_secrets: idx => val} otherwise change your variable Basic Syntax. This approach helps avoid hardcoding values and provides a scalable, maintainable way to manage different aspects of your infrastructure across a wide range of use cases. A map can contain any type as long as all the elements are of the same type. This article demonstrates how to use Terraform’s local values and conditional logic for various general-purpose use cases. Hence the use of the lookup() function. Funnily enough I noticed yesterday that the links to that flatten example and the setproduct example were both a bit buried in the documentation (just a passing remark in the "Using Expressions for for_each" section) and so I pushed up an edit that makes them a bit more prominent. I use terraform version 1. Can <div class="navbar header-navbar"> <div class="container"> <div class="navbar-brand"> <a href="/" id="ember34" class="navbar-brand-link active ember-view"> <span id I'm trying to create a map in locals where a key is created dynamically based on the value of another variable, and can't find a functional way of doing this in Terraform. code A map can contain any type as long as all the elements are of the same type. Hope this helps, Happy terraforming! AWS. 3. without the context with all variables and locals Terraform does not support variables inside a variable. I agree if I were to add api-3 in tfvars. The variables' values will be declared in the same way. Hot Network Questions As suggested in the comments, you can re-organize your local. Thanks for helping out. eladazary November 3, 2019, 11:59am 1. Terraform: Reference locals values inside the creation block. – Cloudkollektiv. It can be used with modules and with every resource type. 1. pets : tostring(i) => pet } } Next create a filtered list of the keys that respectively matches the condition pet. I want to create a Terraform list of maps with some items in the list being conditional. Each instance has a distinct infrastructure object associated with it, and each is separately created, updated, or destroyed I tried below & it seems to be working but it heavily relies on data quality of vals string (shouldn't contain duplicate keys). I then create a few Elastic Network interfaces in the AWS console and added them as locals in the terraform template. id subnet_id = How to iterate through list of maps in terraform while creating locals? 0. Locals can be assigned any valid Terraform data type, such as a [. See: locals { my_dictionary = { "one" = 1 "two" = 2 } } Please how do I simplify this configuration using locals, the code works fine as is but gets complex passing the variables manually each time. x, but when I try to init Terraform 0. Each of these names is an expression that references the associated value. Main. needed. you cannot do a [0] on a map. class == "pub"} route_table_id = aws_route_table. Local values can refer to other local values, even within the same locals block, When a resource has the for_each argument set, the resource itself becomes a map of instance objects rather than a single Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Yes, I tested this in terraform 0. You can complete this tutorial using the same workflow with either TerraformCommunity Edition or HCP Terraform. 4. But this seems fragile as a way of accessing that data. map型は「項目名＝値」の形式で定義します。わかりやすい項目名をつけることで理解しやすくなります。 Terraform interpolation of locals map with key defined in a variable. One way to do that is to combine the input variable with a local value that normalizes it, like this: Terraform locals are called values that you can associate with your code. Modified 2 years, 9 months ago. locals { association-list = { for policy, users in var. wea-nonprod. The resource for_each and dynamic block language features both require a collection value that has one element for each repetition. You can use for expressions to dynamically build a map from one or more variables for your keys, and then use that in combination with the merge function to build a new map with a mix of static and dynamic keys: I know there is an open feature request for deepmerge but I just wanted to see if there is any work around for my use case. The splat expression patterns shown above apply only to lists, sets, and tuples. Let’s delve deeper into how this can be accomplished with practical I have a local variable which looks like: locals { teams = { "team1" = { "username1" = ["role1", "role2", "role3"], This is currently an open issue. subnets: s. You can avoid that problem by telling Terraform the precise type constraint you expect, which will then allow Terraform to Regardless of the shape of your input, the key requirement for for_each is that the map you assign to it must have one element per instance you want to create, and so you can either pre-flatten the data structure at the source, or you can write some Terraform expressions to derive several differently-flattened data structures from your original nested data structure. I failed to mention that I am trying to override a variable that has been pre defined in locals. How to define default value for map variable in Terraform? 0. it helps you to clarify your Terraform code and avoid duplication. But let's see the benefits of using terraform locals in a bit more detail - Terraform locals can be re-used multiple numbers of times in the terraform configuration file. But the for_each should be something like the following one:. There are scenarios where you might wish to iterate over a map conditionally. workspace] may not exist. The following is what I tried. So I would like to create a map like this: afternoon = [feet] evening= [foo, bar] morning= [foo] saturday= [bar] I know if I stored everything as maps I could merge the maps and it would work fine as long as there are no duplicate keys. You don't get key or value variables in a for expression and you can explicitly pull whole entries from the map as I've shown above using key, value in map as the expression form. Apparently, this works correctly, because the keys from the priv_lookup_map are in lexicographical order when provided. I think currently your best bet would be to create local values for each element of the list (remember that you can't use interpolation syntax in the default value of variables; locals exist to get around this limitation). lets consider the following local variables: locals { default = { c It is for this reason that the templatefile documentation recommends using yamlencode for the entire data structure, rather than trying to concantenate bits of YAML together using just string templates. I'm at my wits end with this as I only worked here and there with Terraform and am unable to find any documented cases where this issue was solved. Config Map can be used to store fine-grained information like individual properties or coarse-grained information like entire config files or JSON blobs. The names of the acl's are determined by the keys. As I mentioned on my the end of my post i just dont understand how it works if I use locals/for_each with the exact same structure but hardcoding the bit i am doing the flattening transforming within the locals wont work. Assign provided value if variable/local does not exist. Is there any way to decode the JSON data into a terraform map ? terraform; Share. Terraform: How can I read a value from a json file? 0. It also looks like the keys within the maps are unique across all of the maps, due to the numeric prefix, and so there aren’t any conflicts to worry about when merging all of the If you look at the module. The Terraform configuration must be valid Terraform. Whether you’re new to Terraform or seeking to enhance your Terraform knowledge, this guide will provide valuable insights and examples to help you harness the power of maps in your Terraform projects transforming / combining variables (maps) into locals in terraform. locals = { my_map_of_maps = { map1 = { key = "value" } } } However in the json syntax, the following equivalent This locals variable uses a few Terraform functions and I will explain each function separately. This way, you can easily manage and access complex nested data structures. 2. 11 installed to test. 5. You can actually pass a list of maps to the merge() function:. 149. Iterate Through Map of Maps in Terraform 0. tfvars file → similar to the terraform. Handling list And a project may not override anything, so locals. A common use of maps is to create a table of machine images per region, as follows: transforming / combining variables (maps) into locals in terraform. Personally, I think it looks cleaner to have a list of objects instead of a map in your configuration. ; number: a numeric value. Fetch key value from json data using terraform. Explicit type conversions are rarely necessary in Terraform because it will convert types automatically where required. This terraform creates 3 acls with various rules. – paulg. 3 release, we have implemented a different design of optional object attributes with defaults. output "user_topic_map" { value = I have a map of values, and I'm basically trying to replace a number of different values while in a giant loop. Sometimes using input variables is not enough. In your case, I think that means you need a map with one element per every combination of database and schema. . Hot Network Questions For constructing maps with dynamic keys, in HCL2 (0. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Hi @tomasbackman!. This approach, while requiring a bit more code, offers significant advantages in terms of adaptability and maintainability, especially for configurations involving dynamic terraform apply -var 'env=dr' terraform apply -var 'env=prelive' terraform apply -var 'env=prod' When I pass, for example, env=dr, I want to get the values from the dr variable, and set those on service_principal. location_mapping into mapping, e. Terraform: Local list of A "character" is a grapheme cluster, as defined by Unicode Standard Annex #29. State. for_each is a meta-argument defined by the Terraform language. $ terraform output (no response) I tried few things here - e. using a *. name ]) # Note, we Basics of Lists and Maps in Terraform. g "somediffkey". This makes sense if I have a map of just strings and want to make use of the values for whatever resource configuration. Think of them as user-defined variables that are scoped to In that case, using a locals is a great way to map input variables to sizes. code]locals[. subnets_map: key => val if val. , called local. my_val is used (so later values overwrite previous ones). splitting these values and joining them again into a list, and then running "map" function but it doesn't work either: $ terraform output. I need to have something like the following: For env=dr: Organize Variables and Locals: Place them in separate files (variables. HCP Terraform is a platform that you can use tomanage and execute your Te I read the terraform docs about variables and I cannot find the correct syntax. Flattening nested structures for for_each. Each instance has a distinct infrastructure object associated with it, and each is separately created, updated, or destroyed In a terraform resource i was using for_each loop. In Terraform 1. This requirement is a little more specialized than just flattening all values into a single set, and so there isn’t a built-in function to achieve it but you can get this sort of result using for expressions, which are a more general approach to projecting and filtering data structures. How to access a local using a variable in Terraform. The keys function returns a list of the keys in a given map. A bit About Terraform Map To understand how [. common = [ name, service1, port, 80, hcproto, http, hcport, 80 ] and then trying to create map of that list: That would then give you a map of {name = unitName, value = canary}. my_module : instance. value. 11. x Compatibility Promises; Terraform Internals; Resources mapとfor_eachを使って複数のファイルを作成します。 必要なもの. 12. code] block fetches existing running EC2 instances. The structure is as below: dynamic. 作業時間：15分; Terraformを実行できる環境; map型で設定値を定義する. In locals I have this, something similar to what we use for merging maps: locals { merged_additional_tags = merge( { "primary" Is it possible to do merging on complex objects in the same way you do with maps? Since the ability to pass around deeply-nested maps in Terraform is still relatively new, we haven’t seen enough real-world If you were to place this data into a locals block named environments, then the key-value pair could be accessed (according to the question) like local. You can also describe locals as variables that are not exposed; a user shouldn’t/can’t overwrite them. I tested it with two instances for the “main instances” (main_instance_addrs) and one instance for (dynamodb_instance_addr) and obtained these results. code] works, it’s also important to have a quick discussion about the Terraform map. topic_user and your values are output from the topics modules as the list module. All values have a type, which dictates where that value can be used and what transformations can be applied to it. zone == "us-west-1a" } } resource "aws_instance" "filtered_example" { for_each = Terraform for_each accepts only set of strings or map of strings. s3 if name. Benefits of using Terraform Locals. locals: { l3_crm: [ { parent: "crm", child: [&quo I'm trying to create local variable for for_each loop in other resource, but can't make a local map as expected. Ask Question Asked 2 years, 9 months ago. name => s } } # Create the resources resource "azurerm_subnet" "subnet" { for_each = toset([ for s in var. For example, you can do it on local: variable "users" { default = { "testterform" = { path = "/" force_destroy = true I am new to terraform and understand only how to apply simple for loop over a map and for_each loop in a resource. Unlike variable values, local values can use dynamic expressions and resource arguments. Resources that use the for_each argument will appear in expressions as a map of objects, so you can't use splat expressions with those resources. You may need to terraform init if you haven't already. 0. variable "xpoweredby" { default = "" } variable "xfo_allow" { default = "" } locals { traefik_common kubernetes_config_map_v1_data. Locals allow you to compute values based on input variables, In this tutorial, we’ll cover how to achieve this in Terraform, progressing from basic to advanced examples. In short, Terraform map is a data structure that stores a collection of key-value pairs. I assume you did that because type = map(any) was not able to automatically find a suitable single type to use for all elements when you mixed types. For example: imagine you want to ask a user for a size, which can be”. I think there are a few different ways to get the result you want here, but the one The keys function returns a list of the keys in a given map. When creating multiple subnets, for_each might aws_instances[. If you wanted the value canary there then you'd want to use local. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company This is essentially a map between the CIDR and the subnet id. So, in your example above, you could do: transforming / combining variables (maps) into locals in terraform. The operation of finding every combination of values in two sets is formally known as the cartesian product, and Goal: Be able to create and use locals to further abstract your data. But i might not know the key name and would want to dynamically access the key name similarly to how we access each. For larger or more distributed configurations, you may want to leverage Terraform modules. 1. I need to have an option for cross region . 11 did accidentally support nested maps, and so the above might work but I can't be sure since I don't have Terraform v0. I have this: local = { aks = { type = "aks" } private_endpoints = { type = "base" } } ################################# subnet_feature1 = { aks = { cidr = [ "10. XX" } Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Basic Syntax. Skip to main content. The actual values can come from input variables, resource attributes, or other local In Terraform, locals are used to declare and assign intermediate values within a Terraform configuration. There's also an official Terraform module hashicorp/subnets/cidr which aims to encapsulate subnet numbering calculations. Ignore specific key from terraform outputs or locals. # Outputs: firstchoice = { "firstAChoice" = "foo" "firstBChoice" = "bar" } thirdKey = thirdValue For more To achieve your goal of converting a list of strings into a map of objects in Terraform, follow these steps: Step 1: Initialize list. In that case, using a locals is a great way to map input variables to sizes. 13 and I cannot easily upgrade to 1. XX" } Terraform provides several built-in functions that can be used within locals, such as concat(), join(), map(), flatten(), etc. terraform console Inside the console type: zipmap([for m in local. e. Locals depends_on - Terraform. location_mapping: val["location"]=>val} } Then in your azurerm_log_analytics_workspace you can use it as follows: Disclaimer All use cases for dynamic blocks in Terraform discussed here work similarly in OpenTofu such as a list or map. See how to use Terraform merge function with maps, lists of objects, lists of maps and tags. Terraform dynamic variable lookup. 0 Failed to extract specific value from map object terraform. Terraform map transformation. If it holds the default value, we set an empty map, if not, we will create a key-value map with our desired information. xx, is it possible to modify the keys in the map instead of their respective values? Let us assume that we have the following in the module definition: locals { task_logging = Some extra thoughts on not using count in preference to for_each. When the Terraform code contains many local values (aka locals) it can get cumbersome to manage all those values. location_mapping: val["location"]=>val} } Then in your azurerm_log_analytics_workspace you can use it as follows: Terraform locals - convert a list of maps to a map of objects. Functions in Terraform are designed to be used within expressions. Variables can also be set using a separate file, called a variable file, using the -var-file flag. iam-policy-users-map: policy => { // can't have the nested for expression before the key! Iterate over list of list of maps in terraform. Use the explicit type In Terraform 0. VARIABLES: variable "vm_all" { type = list Terraform for-each with map of objects and a list. 11 was designed to support: it only officially supported maps of strings. Transform a map data structure on terraform. locals {original_map = {apple = 5 banana = 3 orange = 7 In this example, we have declared all the local variables in the locals block. code]. Thanks for the issue. 23 Creating a terraform code for aws secrets creation and I am not sure which variable type I should use. Let’s start by understanding the basic structure and syntax in Balance Variables and Locals: Use variables for external inputs and locals for internal computations. The callers of your module could do this themselves like this: module "foo" { source Given this map in Terraform: variable "subnet_list" { type = map default = { "web" = 0 "app" = 1 "db" = 2 "paas" = 3 } } Is there anyway to dynamically build a new map to be used when for example add subnets to a virtual network as: map modified in runtime: "updated_subnet_list" { type = map { "web01" = 0 "app01" = 1 "db01" = 2 "paas01" = 3 } } Lets locals {original_map = {key1 = "value1" key2 = "value2" key3 = "value3"} cloned_map = { for k, v in local. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company locals { y = { a-j { p0 = "j" p1 = "test-1" p2 = 0 } a-k { p0 = "k" p1 = "test-2" p2 = 0 } b-j { p0 = "j" p1 = "test-1" p2 = 1 } b-k { p0 = "k" p1 = "test-3" p2 = 0 } } } I have got this to work by converting everything to a list, flattening it, and using count, but I'd like to preserve the keys in case the order changes later down the line to I have a variable like below subnets = [ { app_name = "app1" subnets = { "us-west-1a" = ["10. tf references local. terraform; Share. values() then just extract the original maps. topics. At it's core it relies on zipmap to build the map from keys & values lists. Second, you have defined your variable type as a map whose objects have a private_connection_resource_alias field, but you have it commented in the values you're passing to it, and that is wrong unless you explicitly mark the field as optional. Related. code] block creates a local variable [. Array of objects in terraform. locals { prop-list = ["prop1", "prop2", "prop3"] # Add your list of property names here } Is there a way to write a conditional statement with multiple branches in terraform? I'm setting up a terraform module to create an Amazon Aurora cluster. tfe. environments[var. Conditional creation of a resource based on a variable in . Organize Variables and Locals: Place them in separate files I’m trying to use a for_each within locals to iterate files and assemble an object with various properties, and I would reuse this array of objects in various resources. I am trying to create a local as below which is not working: In general, you can validate an object type but not a map type, because the object will have known keys you can parse in the validation block, and the map will not. A final sidebar: you declared your variable here as map(any), where any means that Terraform should analyze the value passed and automatically substitute a specific type to replace any. It would be better to use map for the for each, not list, as list depends on the order of the items: locals { groups = merge([ for group in var. # Apply complete! Resources: 0 added, 0 changed, 0 destroyed. prop-list. sns_topics (module output doc), you can make them the arguments to the function in the output:. 2. Terraform-specific Functions. 12), you have two ways: For expressions + merge. tf): Terraform makes several kinds of named values available. The number type can represent both whole numbers like Terraform has a documented json configuration syntax. 0 Can't create data collection rule for Azure log analytics using Terraform - missing Terraform options? 1 Terraform: Unable to find request URI when creating diagnostic settings resource for Azure Key Vault Looking for the easiest way in terraform to create a JSON string (preferably using jsonencode) or something similar i've looked at the few examples on the terraform docs but still struggling to nail the exact formatting to get this output right. dev_cidrs. In this comprehensive guide, we will delve deep into Using locals and conditional logic in Terraform allows for more flexible configurations, dynamically adjusting values based on various inputs. Terraform - How To Flatten A List With In a List Of Objects transforming / combining variables (maps) into locals in terraform. for loop with multiple lists. // Having vals as a string variable variable "vals" { description = "The name of availability set" type = string default = "hr:recruitment,department:human,tool:sap,fruit:apple" } How to Implement Terraform Locals? Defining local values in Terraform is done using a locals block, with each local assigned a name and value in a key-value pair format. terraform 0. In the regular terraform syntax, I can define a local map of maps as so. 12 nested for loops. I have a sample map like below and am trying to remove any accounts that have a key2 value matching 'bong'. Hi @amsou,. subnet_config : config. For more information, see Referring to A map type in Terraform is a type constructor, which allows you to build up complex types. So the starting map would look like this: Just iterate over your wea-nonprod map: locals { users_to_create = [ for name in var. tf contains this to feed data " You can convert your list of maps, to a map of maps as follows: for_each = {for idx, val in var. Skip to content AWS Learning Kit - 20 Mind Maps + 260 Questions The map of maps of strings you've described is actually beyond what Terraform v0. 13. iam_groups : { for policy in group. One way to do that is to combine the input variable with a local value that normalizes it, like this: So, to reiterate: this code will merge a map variable of tags that (in my case) are applicable to many resources with the tag (Product and App) that are unique to each infrastructure resource. map like function in terraform. Now, I want to map the appropriate ENI to the instance hence I added locals and variables as below. Locals in Terraform. x I get this error: $ terraform init Initializing modules There are some problems with the configuration, described below. If you have control over your subnets and their tags this would possibly be a better approach. common}" var2 = Organize locals with Object Maps. services. Terraform For Loop To Generate JSON From Map. Iterate over list of maps. my_module. – Matthew Schuchard Commented Feb 14, 2021 at 11:44 This Terraform code iterates over the “users” list in the YAML file, creating a new list of maps with keys name and role for each user. locals { virtual_machines = [ { ip_address Convert a Terraform map of string to Terraform lists of string. Consider we have two maps of objects we want to merge together defined in our Terraform locals declaration: locals {map1 = You can make the local value end up having a type that conforms to that variable type constraint by including some type conversion functions (tomap and tostring):locals { default = tomap({ pods = { secondary_range = { range_name = "pods" ip_cidr_range = tostring(var. lcl_vpc_nacl. Terraform for-each with map of objects and a list. code], [. Each group is a key of the map and values of the maps are the different dogs in that group. Take a look at the examples. Organizing the local values on some type of grouping can really Hands-on: Try the Simplify Terraform Configuration with Locals tutorial. Register. I think this somewhat answers your question in the comments for "if both maps are in lexigraphical order isn't this a non-issue?" The output for priv_lookup_map Hi @apparentlymart,. Merge two lists and output. In this All terraform functions can be used inside locals, so it is quite flexible to generate whatever string, list, map, etc . Using YAML Maps in Terraform Modules. code]existing_instances[. The The ability to change values that are likely to change in the future is the key benefit of using Terraform locals. Start by initializing your list of properties (strings) in Terraform. Is it possible to remove a terraform resource from an index without rebuilding. The for_each meta-argument accepts a map or a set of strings, and creates an instance for each item in that map or set. The key usually doesn't have a purpose other than to identify unique items in a map, which can thus be constructed dynamically. code]lookup[. Share Improve this answer kubernetes_config_map_v1. code I need to create the above role_name from each element in the map (prod and dev) so that it's a unique role name for each instance. Want to understand how is it possible what I am trying to do. Commented May 3, 2018 at 13:25. I would like to run terraform only for a specific resource. I. x stays open-source. "*" } } ] }] } # Create a local which maps the name of the the subnet to the subnet itself locals { subnet_map = { for s in var. Which variable type should I use in this example? main. Hope this helps someone in the future. I need to get the child and parent names separately in for each in terraform. tf variable "instance_count" { default = "3" } variable "instance Terraform locals should be used with caution, as using them too often or unnecessarily can cause the configuration to become harder to follow as instead of displaying the actual value or How to iterate through list of maps in terraform while creating locals? 2. Functions take input arguments (such as strings, lists, maps, etc. Terraform. transforming / combining variables (maps) into locals in terraform. The map contains subnet configuration parameters, in the format: <subnet-name> = { subnet_id = <subnet-id> nsg_id = <nsg-id> rtbl_id = <rtbl-id> } I'm playing around with Terraform for a bit and I was wondering if this is possible. The first function is called concat(). Why Spacelift; How it works; Integrations. You also need to use a fat arrow => operator between the key and value of the generated map entries. Now, I’m trying to create a MAP. Expressions are used to define values, calculations, and transformations in your Terraform configuration files. some_other_var_or_datasource) } } services = { secondary_range = { range_name 2. tf line 738, in locals: 738: "${type}" = attribute – apdcm. It's best practice to assign tags to each resource you create on AWS (for example). policies : "${group. Terraform expand map variable to independent parameters. Your input variable would ideally be named iam_policy_users_map instead, and likewise your output value be association_map. can likely be refactored into something far easier to read/understand but I'm still getting my head around what the terraform is doing. So in other words the ni-resource->id needs to map to interface_id and ni-resource->ip_configuration->name needs to map to ip_configuration_name. Hi all! I’m the one that wrote that Stack Overflow answer, so I guess I should explain myself! I typically use flatten with lists when I write examples of this pattern because the flatten function can collapse potentially many levels of nested lists at once and so it generalizes to more than two levels of nesting. OpenTofu is an open-source version of Terraform that expands on Terraform’s existing concepts and offerings. EnvironmentName}" CostCentre = "C1234" Project = "TerraformTest" Department = "Systems" } } It depends on exactly what is the structure of your local. 8. The merge function takes an arbitrary number maps or objects, and returns a single map or object that contains a merged set of elements from all arguments. The resource provides mechanisms to inject containers with configuration data while keeping containers agnostic of Kubernetes. s3 ] } Nested loops and looping over maps in Terraform. instance_details : k => v if v. That way the yamlencode function can guarantee you a correctly-formatted result and you only have to produce a suitable data structure:. Modified 29 days ago. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company How to iterate through list of maps in terraform while creating locals? 2. Make your Terraform configurations more dynamic and reusable with expressions. 5. tf locals { location_mapping = [ { "url": "L1. 0 Can't create data collection rule for Azure log analytics using Terraform - missing Terraform options? 1 Terraform: Unable to find request URI when creating diagnostic settings resource for Azure Key Vault I am new to terraform and understand only how to apply simple for loop over a map and for_each loop in a resource. helper_map: locals { helper_map = {for val in local. You can define the locals like this:. 128/26", "10. When you are using both of them in the same command, the value will be Note: New versions of Terraform are placed under the BUSL license, but everything created before version 1. If you have a set in Terraform, the position is not guaranteed. Let's walk through a few common examples The result of an expression is a value. 192/26", " Terraform locals - convert a list of maps to a map of objects. XX. In situations Currently terraform doesn’t allow variable substitution within variables. Terraform variables can have various type such as string, number, boolean, list, map etc. HashiTalks 2025 Learn about unique use cases, homelab setups, and best Terraform’s flexibility and robustness are often attributed to its wide array of features and functions, and among them, Terraform Locals emerge as a valuable gem. For example, append a prefix to the push subscription name in place like so (within the main. The actual values can come from input variables, resource attributes, or other local values defined in the configuration. tfvars. kind == "cat" by looping over the keys in the pets_map and setting the respective keys that do not match to an empty string. Terraform Version. code], or [. So if you start with ["a", "b", "c"], you have 3 values whose index starts at 0 and goes up to 2. As described in the linked docs: An opaque value that represents the internal version of this config map that can be used by clients to determine when config map has changed. It mainly serves the purpose of reducing duplication within the Terraform code. When you use Locals in the code, since you are reducing duplication of Terraform Locals, often referred to as locals, are a powerful construct that allows you to declare and define values within your Terraform configuration files. If you are working on a large enterprise infrastructure then it is impossible to work without Terraform Locals. value }) } Can I create a map with only some of the values? Something akin to this pseudo-code: Splat Expressions with Maps. Variables can be set in the command line when running Terraform commands using the -var flag. Nested loops and looping over maps in Terraform. auto. 184. For this reason, in the upcoming Terraform 1. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company A for expression is a bit different from a for_each. 0 so not only do I need to create a map from the list of maps but also need to filter results, map one value as key and another value as value, and also need to prefix the new key with a string "lun". A map value is a lookup table from string keys to string values. artxur. Stack Overflow. A local value assigns a name to an expression , so you can use the name multiple times within a module instead of repeating the expression. This can be achieved by combining for_each with a filtering step using a splat expression or compact function. 34. – ydaetskcoR. Wanted to see if something like below Why do we need Looping in Terraform? When managing Infrastructure-as-code (IaC) with the Terraform CLI, one often encounters scenarios where multiple resources that are similar but not identical need to be separately created. Say you remove one of first 2 (maybe the actual data comes from somewhere else and is NOT a hard-coded set), the index of the first one is still 0, but now, The alternative is to put a map inside your Terraform configuration. Upgrading to Terraform v1. Keep it Simple: Avoid over-engineering; use only as many variables or locals as necessary. Existing data not specified in the configuration will be ignored. 13 > Warning: Interpolation-only expressions are deprecated on main. Since your keys are output from the users module as the list module. type. Tests. With the default value you showed here, I think Thank you Marcin for answering my question. Commented Mar 17, 2022 at 14:19. Hot Network Questions You can do this with the Terraform function zipmap. Some programming languages offer that possibility, Terraform does not. This is where I am at with my testing. Can I am trying to access a list inside a list of maps in terraform. Hi @apparentlymart,. resource "aws_route_table_association" "rtb-pub" { for_each = {for key, val in local. _http_settings http_listener So, to reiterate: this code will merge a map variable of tags that (in my case) are applicable to many resources with the tag (Product and App) that are unique to each infrastructure resource. variables. m4. The Terraform language has a general feature for turning lists/tuples into multiple arguments, by using the special symbol after the last argument expression. This is useful for selecting a value based on some other provided value. (Terraform 0. For more info see Kubernetes reference terraform variables string, bool, number, list, set, map. If you want to generate a value based on two or more variables then you can try Terraform locals. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Indirectly-nested lists, such as those in maps, are not flattened. Terraform: changing a list of variables into one list of maps. Here’s an example: locals { environment = "development" } Locals can be assigned any valid Terraform data type, such as strings, lists, maps, or objects. This could range from deploying several instances across different availability zones, setting up multiple DNS records, or managing numerous Terraform Map Variable. As you can see from the values in the brackets, we are taking the output from the App service (APPSVC) we created earlier, called possible_outbound_ip_address_list and I have following terraform maps locals { accounts = [ { "id" = "111111111111" "status" = "ACTIVE" }, { "id" = "222222222222" "status" = "ACTIVE" } ] You can use a combination of map, keys function,index function, and count. Hot Network Questions Shakespeare and his syntax: "we hunt not, we" zipmap() creates a map of region => {region,value} for repeating region the map of the highest index of local. 6. Hi, In order to create a mongodb cluster I’ll need to create a resource which contains some static and dynamic configuration. Note: New versions of Terraform are placed under the BUSL license, but everything created before version 1. yok gtbpls sfzhw oltkddm rnxtmaz uzhuj daw icuucpig ojeeyh ysehepji