Terraform conditional concat. id , list("")), count.

Terraform conditional concat Outputs: domains = dev. 15, but I wouldn't be surprised if they are not yet as I don't recall any I'm going to lock this issue because it has been closed for 30 days ⏳. 7 because that would then be equivalent to the native index syntax, map[key]. Can I do it in one command? I am using terraform version 0. You can also have multiple module declarations referencing the same source but different Here, the compact() function removes any null values, and the list comprehension handles conditional inclusion based on the content of the item. Sometimes your input data comes in separate values that cannot Concatenate variables in terraform V0. s3_buckets[count. These might be resolvable in 0. Types. Terraform also allows for conditional expressions, which are similar to CloudFormation condition functions except that they use the more traditional ternary operator syntax. The following arguments are required: test (Required) Name of the IAM condition operator to evaluate. You switched accounts on another tab or window. I found out about this in the meantime too, thanks. For this to work you of This is a WRONG answer. Registry (opens in new tab) Try Hands-on: Try the Simplify Terraform Configuration with Locals tutorial. 11, a common trick is to join the lists together into delimited strings and then split them again after selection: Terraform requires both branches of a conditional expression to produce the same type of result for consistency. Provide details and share your research! But avoid . I also needed to be able to pass additional policy statements to the module which may or may not include a condition. Variables within variables. For sets of strings, Terraform sorts the elements by their value, using lexical sorting. The first occurrence of each value is retained and the relative ordering of these elements is preserved. If your goal is to use different behavior when the list is empty, test the length of the list instead: Hands-on: Try the Simplify Terraform Configuration with Locals tutorial. 6. The concat function in Terraform is used to combine multiple lists into one. If you're familiar with traditional programming languages, it can be useful to compare Terraform modules to function definitions: This iterates over all elements and includes "d" only if the condition is met. Ask Question Asked Viewed 6k times 6 . By using a I have 2 json files, in one I have policies and in the another one I have clusters with custom configurations, the thing is if a cluster has a policy_id key, it should be merged/join with the respective policy to get its default configurations, if not just returns the base cluster. If the length of the list is greater than 0, take the Terraform Version 1. I need to have an option for cross region . Sign-in Providers hashicorp aws Version 5. So if you have two boolean variables, var. What's the best way to concatenate variables with strings? In V0. We’ll also look at some of the different types of maps, the best practices for using It looks quite complex, because we also need to work around an issue with Terraform where it will evaluate both return values from a conditional expression (this will be fixed in 0. HOWEVER, heredocs are strings - but what you’re trying to put inside your heredoc is not a string - it’s another piece of Terraform expression language! This means that even if you get your heredoc syntax correct, Also would like to get your thoughts on what I was trying, clearly its giving me errors. Register. For maps and objects, Terraform sorts the elements by key or attribute name, using lexical sorting. The try function will not catch errors relating to constructs that are provably invalid even before dynamic expression evaluation, such as a malformed reference or a reference to a top-level object that has not been declared. 0. index. 11. In Terraform, a boolean true is converted to a 1 and a boolean false is converted to a 0. 12 and later, you can use join() function: Example: If you just want to concatenate without a separator like "foo"+"bar" = "foobar", then: Reference: You can use the Terraform concat function to combine lists and manage the configuration flexibly. concat( data. 2 You might have already noticed some Terraform functions, such as like substr, concat, length, and base64decode, in the examples in this guide. vmTags], [(element([var. The label contains determines whether the list, tuple, or set given in its first argument contains at least one element that is equal to the value in the second argument, using the same definition of equality as the == operator described in Equality Operators. The label 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 Use iterators when you need to reference dynamic data that is not known until after Terraform applies a configuration. IF msr_count >= 1 - Use second codeblock to run ELSE use the first one Is it possible in Terraform Or I will need to make a wrapper somewhere? Thanks in Advance. kms_keys : k. ; title converts the first letter of each word in a string to uppercase. When data is static or you know the values before synthesizing your code, we recommend using loops in your preferred programming language. For more complex scenarios, such as when elements to be included are based on multiple conditions, you may use nested list comprehensions or the flatten() function to simplify Use-cases. conditional operator cannot be used with list values. Terraform's conditional operator c ? t : Nevertheless i got used that terraform is not programming language and i solved my problem using concat function and two separate for loops. Because the aws_instance resource above has the count argument set to a conditional that returns either zero or one, the value of aws_instance. Conditional Case Conversion. My team uses Terraform to deploy the necessary infrastructure. 4. Documentation Also I found this answer helpful working with locals. Arithmetic Operators. Finding combinations for for_each. The jsonencode function would not accept a Terraform block within its input parameters, but rather only HCL2 types. subnet_id))),0)}" From the I don't expect any other solution to be much better than this. Without a more complete example, I’m not sure about what the other errors mean. Checkout the sources of the official AWS This allows test authors to validate logical operations and custom conditions within their infrastructure in a process analogous to unit testing. Sets are not ordered, so this check is in place to The concat() function in Terraform is a simple yet powerful tool for combining lists. In other words, it computes the union of the sets. You signed out in another tab or window. Given that, it probably requires O(n) comparisons + appends, and then takes O(n) space because a new list is created. trimprefix removes a word from the start of a string. It is a source-available tool that codifies APIs into declarative configuration files that can be shared Related Functions. 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. An S3 bucket can only have one aws_s3_bucket_policy, and the module needed to include a default policy to force TLS v1. The solution you mention should work, but that seems to be the solution provided in the linked question, which I'm trying to avoid having to resort to now that Terraform offers to build the resulting JSON for you with the i'm trying to create a kubernetes cluster from kops using terraform,following code is a part of infrastructure, i'm trying to create the name concatenate with two variables, and i'm getting illegal Example 4: Terraform Merge Lists. The concat function combines two or more lists into a single list. Skip to main content. 0 this should be “just happening”: Input Variables - Configuration Language | Terraform | HashiCorp Developer Passing a null value as a module input argument will override any default value. index)] ) } Do you think it could have also worked? BTW note that the usual naming scheme for Terraform is underscores separating lowercase words, not camel-case. Improve this question. For example, instance IDs that cloud providers assign on creation. xyz_subnet2 ) } To work around this with Terraform 0. 0 complains about an empty tuple and that the collection has no elements. A list is an ordered collection of values, Using concat with Conditional Logic. The answer by deniszh is pretty close, but I thought I'd clarify it a bit and clean up the syntax. Terraform doesn’t directly support merging lists of objects using the merge function, but there are effective workarounds to achieve this. 73. I'm thinking I may have to create a list from the two outputs first, then concat the two lists together, but not entirely sure. How to concatenate strings in Terraform? i'm trying to create a kubernetes cluster from kops using terraform,following code is a part of infrastructure, i'm trying to create the name concatenate with two variables, and i'm getting illegal A "character" is a grapheme cluster, as defined by Unicode Standard Annex #29. 28 Appears that since terraform 1. Follow asked May 2, 2019 at 17:44. However, in situations like this where you might intentionally want to use a different type for each case, you can use other language constructs that will allow Terraform to Hi @amanohar,. This helps our maintainers find and focus on the active issues. Terraform Conditional depending if a resource has been created. id, list(var. About; How to use if else-if else condition in Terraform. For sets of other types, Terraform uses an Running terraform apply will output:. UPDATE::: The Terraform language includes a number of built-in functions that you can call from within expressions to transform and combine values. For more information, refer to Conditional Expressions. Hands-on: Try the Customize Terraform Configuration with Variables tutorial. 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. default_tags): v │ ├──────────────── │ │ local. However, omitting default is deprecated since v0. Although its quiet a simple operation, It turns out like a familiar issue . kms_master_key_id = concat([ for k in var. This code snippet demonstrates how to conditionally concatenate the list of production-only resources with the common resources, based on the deployment In conclusion, mastering string concatenation in Terraform is crucial for building dynamic and flexible infrastructure configurations. FWIW, using merge() with objects also seems Recently, I was creating a terraform module that creates an S3 bucket. 32. terraform_remote_state. com,test. ; replace replaces a substring of a string with another string, optionally matching using the same regular expression syntax as regex. ; If I'm trying to update my terraform files from V0. tf line 58, If I concat lists, I expect a list to be returned, not a tuple. foo * var. This for expression iterates over each element of var. Whether you're assembling resource names, generating file paths, or crafting user Then your first argument to concat will be the list of unconditional elements, while your second argument will be a conditional expression (the condition ? result : result syntax) which chooses between a list with one element or a list with zero elements, to decide dynamically whether to include that last item. In other words, AWS evaluates the conditions as though with an "AND" boolean operation. regexall searches for potentially multiple matches of a given pattern in a string. Comprehensive Step-by-Step Guide to Using the Merging Lists of Objects. The concate function takes multiple The setunion function takes multiple sets and produces a single set containing the elements from all of the given sets. As a result, neither var. com This example first uses a for expression within the join() function to iterate over the prefixes list and create a list of terraform: Append to a list using concat. This function uses Unicode's definition of letters and of upper- and lowercase. Publish Provider Module Policy Library Beta. Flattening nested structures for for_each. Terraform also permits dynamic string manipulation based on conditions. worker. tfvars" -var-file="custom. aws_ami` section in the `aws_instance` resource. Unfortunately, there is not an obvious way to include the condition Use HCP Terraform for free Browse Providers Modules Policy Libraries Beta Run Tasks Beta. It iterates over a given complex value, and generates a nested block for each element of that complex value. Failing fast at scale: Rapid prototyping at Intuit terraform Concatenate variable and string. Terraform merge lists combine multiple values and lists into A dynamic block acts much like a for expression, but produces nested blocks instead of a complex typed value. tfvars" then variables declared in both files will be taken from the file listed last. 12 makes a stronger distinction between list and set values than 0. Expressions refer to or compute values within a configuration. This is a special function that is able to catch errors produced when evaluating its arguments, which is particularly Here's how you can do string concatenation in Terraform: Using ${} Syntax: The ${} syntax allows you to interpolate variables and concatenate strings within Terraform configurations. , lookup(), join(), concat()), allowing you to see how they behave with certain inputs or data structures. xyz-subnet. The aws_iam_policy_document is primarily for defining entirely new policies, but for this sort of task of wrangling existing policies (which may or may not have been created with aws_iam_policy_document, I suppose) I think it would be easier to decode the policy JSON using jsondecode and then work with those resulting data structures before merging the result back In Terraform 0. 0 Latest Version Version 5. The label Use HCP Terraform for free Browse Providers Modules Policy Libraries Beta Run Tasks Beta. example is a list of either zero or one elements. Also you would want a map type here for the element of the list anyway instead of a nested block as an AWS IAM policy would not be able to transform/serialize from a Terraform block. Hot Network Questions distinct takes a list and returns a new list with any duplicate elements removed. I have a dynamically-generated map of maps (or list of maps), and I'd like to merge them all down to a single map, using standard merge(map1, map2, ) rules. 2 Latest Version Version 5. I need to have an option for cross region I'm setting up a terraform module to create an Amazon Aurora cluster. 11 to 0. 12 and I have some questions. 8) (concat(digitalocean_volume. In your case, that list can either have zero or one elements, and so we must handle both of those cases in any expression that refers to it. The arithmetic operators all expect number values and produce number values as results: a + b returns the result of adding a and b together. Terraform - How to use conditionally created resource's output in conditional operator? 2. For Terraform 0. index) : ""} Share. If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further. a As an alternative you might want to consider restructuring your variables a bit and to provide them through input files. attr, list())[0] should do the trick then. We'll cover examples In Terraform, combining strings, a process known as concatenation, is essential for creating dynamic and flexible infrastructure configurations. In this article, we will discuss what the Terraform concat function is, and While string concatenation in Terraform may seem straightforward, it’s essential to be aware of the available functions like join to handle various scenarios effectively. See the terraform doc link at the end of the page. The instance_ip_address output value uses the one function as a concise way to return either the private IP address of a single instance, or null if no instances were created. bar, you can represent AND using simple multiplication: count = "${var. Concatenate a string with a variable. I think you can remove the boolean condition though? element will wrap around the index if it surpasses the list's length, so just looking up Terraform attempts to select a result type that all of the arguments can convert to, so mixing argument types may produce surprising results due to Terraform's automatic type conversion rules: Every terraform resource has a count option, so you could combine your default_regions and new_york modules into a single module with a region variable and then in each resource that only exists in new_york do `count = region == "new_york ? 1 : 0 or vice versa. ; trimsuffix removes a word from the end of a string. Define Iterators The jsonencode function would not accept a Terraform block within its input parameters, but rather only HCL2 types. HashiTalks 2025 Learn about unique use cases, homelab setups, and best practices at scale at our 24-hour virtual knowledge sharing event. The arithmetic operators all expect number values and produce number Terraform 0. kms_description == var. 12. The == operator can only return true when the two operands have identical types, and the type of [] alone (without any further type conversions) is an empty tuple rather than a list of strings and so I expect that comparison is always returning false. Ask Question Asked 5 years, TF_WARN_OUTPUT_ERRORS=1 terraform apply ${element(concat(google_compute_address. locals{final_tags = concat ([var. tf files. I want to concatenate the values of a list of maps that share the same key. Stack Overflow. Asking for help, clarification, or responding to other answers. Setting nullable to false ensures that the variable value will never be null within the module. I've a question on printing the values with a given condition json file: { "team1" : [ { Basic Syntax. It then builds a new tuple value with all of the results of executing that expression in the same I'm setting up a terraform module to create an Amazon Aurora cluster. Important Considerations: Dynamic Blocks: While not directly applicable to lists, you can use dynamic As an alternative you might want to consider restructuring your variables a bit and to provide them through input files. ; If Hands-on: Try the Create Dynamic Expressions tutorial. When you start a project with a simple setup, you might have just one or two environments, and managing resources is easy. If count = 0 for aws_nat_gateway. The answer is try evaluates all of its argument expressions in turn and returns the result of the first one that does not produce any errors. normalized_value attributes without the need to repeatedly check for and handle absent attributes that would otherwise produce errors. name. terraform apply -var-file="common. Indirectly-nested lists, such as those in maps, are not flattened. If you're familiar with traditional programming languages, it can be useful to compare Terraform modules to function definitions: Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. The given expressions are tuple and tuple, respectively. Perhaps concat. However, if lexical sorting by key is sufficient for what you need -- which it sounds like should be true in I understand that this request came from a subjective preference favoring concatenation syntax over the other options, but since Terraform already offers at least three different ways to concatenate strings together, and most authors seem happy to use the template interpolation form, I don't feel like this addition would be impactful enough to justify the cost of Related Functions. 6 Terraform Configuration Files locals │ Error: Inconsistent conditional result types │ │ on main. 0 This is 0. non_existent or local. kms_id if k. All values have a type, which dictates where that value can be used and what transformations can be applied to it. Here's how you can do string To be able to conditionally append objects (or strings) to a list in terraform we must put it in another way: How do we dynamically generate a list of objects? The answer is using In Terraform, combining variables and strings is a common task for creating dynamic resource configurations. To be able to conditionally append objects (or strings) to a list in terraform we must put it in another way: How do we dynamically generate a list of objects?. kms_description ], ["aws/s3"])[0] I need to define a resource in Terraform (v0. concat(type. We can also use try to deal with situations where a value might be provided in two different forms, allowing us to normalize to the most general I'm into the terraform world recently and learning based on the requirements. How to pass/concat variable into the `data. The resource for_each and dynamic block language features both require a collection value that has one element for Terraform supports conditional expressions of the format <CONDITION> ? <TRUE_VAL> : <FALSE_VAL>. . terraform; or ask your own question. Dismiss alert. The new syntax is pretty straightforward reguarding the . list, and then evaluates the expression upper(s) with s set to each respective element. In the following example, the two expressions return the exact same result. 0 reports inconsistent data type only when array is in conditional statement #30866 Closed AndreiPotemkin opened this issue Apr 13, 2022 · 10 comments · Fixed by #30879 So here is what I want as a module in Pseudo Code: IF UseCustom, Create AWS Launch Config With One Custom EBS Device and One Generic EBS Device ELSE Create AWS Launch Config With One Generic EBS Device The slice function extracts some consecutive elements from within a list. Joining Elements with Complex Conditions. Install; Tutorials; Documentation. The simplest expressions are just literal values, like "hello" or 5, but the Terraform language also allows more Your arguments to concat have a typo, you need to supply multiple lists which are to be concatenated, while you have supplied a single list (this however would probably be a valid argument to flatten). Concat Function in Terraform. A safer approach is to take advantage of the concat and one This is pretty much what you are restricted to in Terraform < 0. The resource for_each and dynamic block language features both require a collection value that has one element for terraform: Append to a list using concat. It can be used with modules and with every resource type. Examples A dynamic block acts much like a for expression, but produces nested blocks instead of a complex typed value. , if) to control behavior based on the presence or absence of specific patterns in strings. We'll illustrate their usage with practical examples to help you effectively manage strings in your The concat function combines two or more lists into a single list. This article explains the two primary methods for This article explores two primary methods for string concatenation in Terraform: using the ${} syntax and the join() function. The for_each meta-argument accepts a map or a set of strings, and creates an instance for each Terraform enables you to safely and predictably create, change, and improve infrastructure. address, list("")), 0)} Share. Yes this is possible, you need to use the for expression in Terraform to achieve this though, the for loop converts the list of objects into a value in which Terraform can loop over using for_each, without the for expression, Terraform cannot loop over the list of objects because there is no key value for Terraform to reference. subnet_id = "${element(compact(concat(aws_subnet. tf line 8, in locals: │ 8: value = k == "tags" ? concat(v, local. 54. Terraform 0. The fact that you alternatively want to use "aws/s3" actually makes the fix quite easy:. A dynamic block acts much like a for expression, but produces nested blocks instead of a complex typed value. 10. 83. Using the condition ? true_val : false_val syntax, you can decide to convert a string’s case based on external factors, such as whether an Terraform, a popular open-source tool developed by Practical Guide Conditional Logic in Terraform Generating Random Values in Terraform Generate Passwords in Terraform Deploy an AWS Load Balancer Convert Num to Str & Vice Versa Removing Duplicates in Terraform Merging Maps in Terraform Concatenate Lists in The concat function combines two or more lists into a single list. I was trying to concatenate two list of maps using count. g. upper converts letters in a string to uppercase. example. How to append in terraform output variables to list in root module? 2. 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 Because function arguments are ordered, this only works with sequence types (lists and tuples) and not for maps. concat function pulled into terraform source code; concat source code. 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. We can accomplish this with the concat function distinct takes a list and returns a new list with any duplicate elements removed. We can accomplish this with the concat function The problem seems to be that you try to give a list as kms_master_key_id instead of just a string. I have created a compute module that has a conditional to create an external IP. natgw then the concat will leave you with an empty string, else you will have your attribute. 11, Terraform evaluates both of the expressions in the conditional before choosing which one to return, and so they must both be written to succeed. *. 0. Related Functions. The for_each meta-argument accepts a map or a set of strings, and creates an instance for each The replace function searches a given string for another given substring, and replaces all occurrences with a given replacement string. cache_nodes. If nullable is false and the variable has a default Append string to each element of a list in Terraform · 1 · Combine two lists into a formatted string in Terraform · 38 · Concatenate two lists concat - Functions - Configuration Language | Terraform | The concat function combines two or more lists into a single list. Note that remote APIs may have a different definition of "character" for the purpose of length limits on string arguments; a Terraform provider is compact takes a list of strings and returns a new list with any null or empty string elements removed. 14 crashes, Terraform 1. index]. 12 and I was wondering what was the "best practice" to concatenate string and vars in my . Some resources allow you to use an empty string to omit basic values and the provider will interpret this as a null value, not passing it to the API endpoint so it won't complain about it not being set properly. foo and var. 2. Terraform. The Terraform language uses the following types for its values: string: Related Functions. Like CloudFormation with intrinsic functions, Terraform has a series of built-in functions that are available for use in your configurations. @Lotarcc, I have not tried to put together a reproduction if this myself yet, as there are a number of undefined values in the config. Input variables let you customize aspects of Terraform modules without altering the module's own source code. Reload to refresh your session. The answer is Terraform: How to extract filename/extension from a path ; JSON encoding/decoding in Terraform: Explained with examples ; Sorting Lists in Terraform: A Practical Guide ; Terraform: How to trigger a Lambda function on resource creation ; How to use Terraform templates ; Understanding terraform_remote_state data source: Explained with examples Test Functions: The console supports built-in Terraform functions (e. Terraform expand map variable to independent parameters. This article explains how to achieve this using direct concatenation and the join () function. Here's an Terraform requires the true and false expressions in a conditional to have compatible types because it uses the common type as the return type for the conditional during type checking. Examples I'm updating from terraform 0. For some reason, Terraform always thinks it has to recreate a resource, because I'm passing in a value that is calculated at runtime. In locals the count object can not be used; and referencing aws_elasticache_cluster. From a visual inspection, I am guessing that the spec objects are where the real difference lies, as the msr values will have different types. I always try to avoid doing it like that but very often it's only way to go. You signed in with another tab or window. x Terraform. Currently, our stack is composed of: AutoScalingGroup fronted by a Load-Balancer, and a Route53 DNS record that points to this LB; Any help on how to concat the two outputs and the custom list into one will be appreciated. The concat function is designed to merge lists. substr performs a similar function for characters in a string, although it uses a length instead of an end index. but to avoid link rot, I'll use the OPs example subnet_id argument using the answers in the github issue. non_existent are supported. (1) (I have showed you in above sample) via TF_VAR_subnet, (2) use the default value directly when set the variable,(3) feed with -var 'foo=bar' or -var-file=foo with terraform The Terraform language has a set of operators for both arithmetic and logic For more information, refer to Conditional Expressions. In Terraform it's a pretty common situation to need to convert between a value that might be null and a list that might have zero or one elements, or vice-versa, and so Terraform has some language features to help with that. default_tags is tuple with 1 element │ │ The true and false result expressions must have consistent types. 2 min read | by Jordi Prats. Examples To merge the list you can use the Terraform concat function. 1. 2. I have a list of maps that looks like this: tags = [ { key = "env" value = "dev" }, { key = "project" value = "tata Because the aws_instance resource above has the count argument set to a conditional that returns either zero or one, the value of aws_instance. The second example is what Terraform calls a splat expression. This answer provides a solution to working with count resources in When using multiple condition blocks, they must all evaluate to true for the policy statement to apply. Hot Network Questions UK citizen living in France, which documents to go to Poland? Dark Fantasy/Sci-Fi Trilogy about an immortal woman who tells her life story How to Conditional + concat = new resource It's very difficult to phrase the question properly, but hopefully the post will explain things a bit better. The Overflow Blog “Data is the key”: Twilio’s Head of R&D on the need for good data. The Terraform language has a set of operators for both arithmetic and logic For more information, refer to Conditional Expressions. The general syntax for function calls is a function name followed by comma-separated arguments in I'm looking for some functionality that will allow me to dynamically determine the elements of the source_policy_documents list. for_each is a meta-argument defined by the Terraform language. The instance_ip_address output value Terraform : merge list of maps and concatenate their value from duplicate keys. 4. In this case we can use a Hands-on: Try the Simplify Terraform Configuration with Locals tutorial. David Concatenate two lists in Terraform 0. Use the “concat” Function. I followed the work-arounds in the mentioned thread, but they looked looked quiet complicated (Using compact split and join functions together). In this blog, we’ll cover what Terraform maps are, explore their use cases, and provide some practical examples. For historical reasons, the default parameter is actually optional. id , list("")), count. list; append; concatenation; terraform; Share. Its ability to merge lists of any data type makes it versatile for various tasks, from resource Can Terraform concatenate variables fed from a for_each loop with a string. Terraform v1. 0 introduced the ability to mock data returned by the providers during a That might be justification for using the concat approach even in modern Terraform, although arguably the intent wouldn't be so clear to a future reader: Concatenate strings in Terraform for tags with condition. ; trimspace removes all types of whitespace from both the start and the end of a string. If you're familiar with The ? character combined with the : character is part of a conditional expression in Terraform and is not considered an operator. If you provide parameters to terraform like this. extraTags], count. In this particular case, concat is failing in this way because concatenation requires all of the elements to have a well-defined order so that the result can also have a well-defined order. Terraform will allow whatever, of course, but if you want to be consistent with community modules you might use then it can be helpful to stick to the usual idiom. Can Terraform concatenate variables fed from a for_each loop with a string. This functionality allows you to share There are three ways to deal with terraform variables. The join function provides a flexible way In Terraform, you can perform simple string concatenation using the ${} syntax or the join() function, depending on your specific requirements and use case. 82. I would create a minimal, reproducible example, using the latest release of terraform, With the above local value expressions, configuration elsewhere in the module can refer to local. 1. 12 - concat() 0. 11 to V0. The resource for_each and dynamic block language features both require a collection value that has one element for each repetition. how to Use HCP Terraform for free Browse Providers Modules Policy Libraries Beta Run Tasks Beta. values (Required) Values to evaluate the condition The result of an expression is a value. 11 I use this: $ Concat strings and list variable in terraform. apparentlymart February 9, 2024, 11:42pm 3 See the relevant issue from the terraform project for more info on why the below is necessary with the older versions. 0 Basic Syntax. abc_subnet2, ) : data. 11 did, and includes some additional checks like this. a - b returns the result of I want to tell terraform something like. Concatenate strings in Terraform for tags with condition. In Terraform 1+ list() becomes tolist(). This seems to result from complex objects When count is set for a resource, references to that resource then return a list of objects rather than a single object, and so we need to write our other expressions with that in mind. Just appends elements into a new slice. abc_subnet, data. Error: Inconsistent conditional result types │ │ on mytest. Terraform provides a way to manage the structure code with the merge lists. Concatenate a list and resource output in Terraform v1. You can also use regex() in conjunction with conditional statements (e. 7. cc_redis. bar}" As per Strings and Templates - Configuration Language | Terraform | HashiCorp Developer, the ending marker of a heredoc must appear alone on a line. 12). pny uvmfen oxmvx oijsq bhozzhg oeovszi nvgmui axabmeb vecpjxd fwswle