terraform concat string and variable

Learn more about Teams literal, to dynamically construct strings from other values. Lets take a look at an example of how to use the join function in a terraform plan. To get more clarity on this topic, lets take a look at the difference between a Terraform List and a Set. So Terraformsfor_eachtype requirement stems from uniqueness. Example: variable "list" { default = ["My","list","","of","","stuff"] } # Returns ["My","list","of","stuff"] output "compact_list" { value = This website uses cookies to improve your experience. Thanks for contributing an answer to Stack Overflow! It works very much as you would expect We use cookies to ensure that we give you the best experience on our website. Most languages support in string variable substitution like this. Error: Error refreshing state: 1 error(s) occurred: * data.aws_subnet.subnet: 1 error(s) occurred: * data.aws_subnet.subnet: data.aws_subnet.subnet: no matching subnet found, 2022 CloudAffaire All Rights Reserved | Powered by Wordpress OceanWP. There are a few different alternatives here, with different tradeoffs. The %{if }/%{else}/%{endif} directive chooses between two templates based Now, we dont have to do it for simple references and we can take advantage of the complex datatypes much better. To learn more, see our tips on writing great answers. characters ("). How to save a selection of features, temporary in QGIS? By looking at Terraform output, we can confirm that resulting resources created with the for_each is a Map. How do I submit an offer to buy an expired domain? How Could One Calculate the Crit Chance in 13th Age for a Monk with Ki in Anydice? In the previous example, we pointed out the conversion of the List to a Set withtoset(local.avengers). If terraform has a min function, you could do something like. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. list/tuple of string in terraform not working in the IAM policy resource, Terraform interpolation of locals map with key defined in a variable, Error: Invalid index empty tuple The given key does not identify an element in this collection value, Error: Invalid Index The given key does not identify an element in this collection value Transit gateway routes, Two parallel diagonal lines on a Schengen passport stamp. the jsonencode function or Instead, use It looks like the true part of the ternary is still getting evaluated even though the condition is false. How do I get the IP of a vsphere_virtual_machine to run ansible-playbook? I'm very new to golang, so I'm trying to follow: terratest_code-base while buidling my test to read the cw log stream. main_api_gw = "app.api${var.env_name == "prod" ? "." : ".${va So something like this. Templates let you directly embed expressions into a string manipulating text. The first argument is a delimiter. I don't see why this is bad practice. i added my code @Marcin can you help me on this, in my terraform.tfvars: domain_names = [ { domain_name = "domain1" elasticsearch_version = "6.8" }, { domain_name = "domain2" elasticsearch_version = "6.8" }, ]. Any identifier is thanks, you are the Terraform king! Accept Terraform. How to tell if my LLC's registered agent has resigned? If you only have a variable, youll get a warning. The concat() function in TF appears to be for lists not strings. https://www.terraform.io/docs/configuration/functions/format.html, https://www.terraform.io/docs/configuration/functions/join.html, https://www.hashicorp.com/blog/terraform-0-12-preview-first-class-expressions/, https://developer.hashicorp.com/terraform/language/expressions/strings#string-templates, Microsoft Azure joins Collectives on Stack Overflow. WebRegistry . No, substr() returns an error if the length parameter is greater than the actual string length. I still have not managed to achieve a few things there. Either email addresses are anonymous for this group or you need the view member email addresses permission to view the original message, I'm hitting a possible limitation in Terraform interpolation where I'm attempting to truncate a string if it's longer than a certain number of characters. Up to Terraform 0.12, the only way to concatenate strings was actually using interpolation, which is not too bad: locals { s1 = "interpolation" s2 = "concatenation-through-$ For example, You do not have permission to delete messages in this group. after lot of research, It finally worked for me. I was trying to follow https://www.hashicorp.com/blog/terraform-0-12-preview-first-class-expressi This is a reference: bucket = aws_s3_bucket.my_bucket.id`. If you try to use Terraform like any other programming language, you are setting inputs = { Each element in the iteration needs to have a unique key. template sequences. %{ for ip in aws_instance.example. A quoted string is a series of characters delimited by straight double-quote So as the title says: How do you do simple string concatenation in Terraform? Whitespace Stripping To allow template With a map, the key naturally provides uniqueness already. the yamlencode function so that Terraform and given between the markers, converts the result to a string if necessary, and rev2023.1.18.43174. I was trying to follow https://www.hashicorp.com/blog/terraform-0-12-preview-first-class-expressions/, but it did not work. The recommended way to use afor_eachloop is with a Map value. Up to Terraform 0.12, the only way to concatenate strings was actually using interpolation, which is not too bad: Lately the join function was introduced. It works very much as you would expect it to work in Javascript or Ruby. The first argument is a delimiter. The second argument is a single list of strings to be joined. Heres an example: value = "${data.aws_subnet. foo, bar, baz The resultant value which is outputted is: Now, another example, this time without using a variable: A short article, but hopefully one that demonstrates how you can use the join function in Terraform to concatenate multiple strings from a defined list. Q&A for work. Making statements based on opinion; back them up with references or personal experience. Does the LM317 voltage regulator have a minimum current output of 1.5 A? is there a way to concatenate multiple list variables in terraform locals, Microsoft Azure joins Collectives on Stack Overflow. Reference the Ter The second argument is a single list of strings to be joined. https://developer.hashicorp.com/terraform/language/expressions/strings#string-templates. The syntax you have shown is correct for both Terraform 0.11 and Terraform 0.12. Signup for Exclusive "Subscriber-only" Content, AWS CLI has become a life saver when you want to manage your AWS infrastructure efficiently. Looking to protect enchantment in Mono Black, Poisson regression with constraint on the coefficients of two variables be the same. Function name: compact (list) Returns: Takes a list and removes any empty string values in the list. Also, Sets do not have any particular ordering. inserted into the string, producing a result like "Hello, Juan!". consists entirely of the identifier given in the introducer. In this example, we shall see how we can create an auto-scaling group in AWS using terraform for_each capability. EO, meaning "end of". how can i concat these and use them in one resource like this: You can use flatten and the following new version of your for loop to get your desired list: Thanks for contributing an answer to Stack Overflow! What they want to achieve with the new syntax is to differentiate between full-blown string interpolations and simple variable references: This is an interpolation: name = "My-Bucket${var.bucket_prefix}" Terraform Configuration Language Functions concat v1.3.x (latest) concat Function concat takes two or more lists and combines them into a single list. I need to pass a variable to a data construct. 'stage-a'.id}", $ TF_VAR_subnet="private" terraform apply. Asking for help, clarification, or responding to other answers. Terraform: Pass a variable containing a list of strings to a jsonencode section 19,046 When you are interpolating a value into a string that value must itself be convertible to string, or else Terraform cannot join the parts together to produce a single string result. Thefor_eachargument will iterate over a data structure to configure resources or modules with each item in turn. template once for each element, concatenating the results together: The name given immediately after the for keyword is used as a temporary A %{ } sequence is a directive, which allows for conditional Certified AWS, Azure & GCP Architect | HashiCorp Ambassador | Terraform SME | KopiCloud Founder | ex-AWS | Entrepreneur | Book Author | Husband & Dad of , Chronicle Parser (CBN) Alerts to YARA-L Detection Rule Alerts. Any ideas on how I can do this please? So the difference between a List and a Set is that Set values are all guaranteed to be unique. To allow template directives to be formatted for readability without adding Why did it take so long for Europeans to adopt the moldboard plow? Well cover the looping constructs that specifically work at theresourcelevel. Examples > concat ( ["a", ""], ["b", By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. variable custom_tag is assigned to this for_each functionality. Terraform sjwood February 7, 2022, 10:47am #1 Hi Folks In the terraform console (Terraform v1.1.5) Im wanting to join 2 list (map (string)) variable types removing any duplicates on name and keeping the map entry in the var_a in this case but the distinct function doesnt seem to be doing this. Both of these syntaxes support template sequences for interpolating values and Terraform did this by design. Terraform, and also the most commonly used. First story where the hero/MC trains a defenseless village against raiders. : var.env_name}${var.env_name == "prod" ? "" I have the following data null_data_source: So when env_name="prod" I want the output app.api.mydomain.com and for anything else - let's say env_name="staging" I want app.api.staging.mydomain.com. In this story, we will look for examples to work with string variables in Terraform. Here we have defined a variable called example-list which contains a list of strings. The newer versions might get warning for this syntax. string if the condition expression returns false. Also consider using the string functions, please check : move a dot outside the expression to simplify: How do you do simple string concatenation in Terraform?

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