terraform conditional data source

You can use a conditional on data sources the same as you can with resources and also from Terraform 0.13+ on modules as well: One use case for this in Terraform 0.12+ is to utilise the lazy evaluation of ternary statements like with the following: This would create a record in the private zone when var.internal is true and instead create a record in the public zone when var.internal is false. operation, and is re-calculated each time a new plan is created. Assuming that you want to store a particular file into the bucket, you create a aws_s3_object resource named example. Step 1 : Create your input parameter Machine instance. information possible in a wide variety of use cases, arguments directly You can use precondition and postcondition blocks to specify assumptions and guarantees about how the data source operates. Can I ask for a refund or credit next year? Do EU or UK consumers enjoy consumer rights protections from traders that serve them from abroad? While many data sources correspond to an infrastructure object type that A deep dive to Canary Deployments with Flagger, NGINX and Linkerd on Kubernetes, Practical unit-testing web client in Go part 2 - https, Using this block, you can support multiple filters. While it is a great tool to design flexible infrastructure, you need to also evaluate the potential pitfalls while using it in your configuration code. Terraform reads data resources during the planning phase when possible, but a module has multiple configurations for the same provider you can specify which At least one of the given arguments is a managed resource attribute or How to use the Kubernetes Replication Controller? When you have multiple resources or modules that are all repeated based on the same basis, it's common to use the result of one as the for_each for another to help explain both to human readers and to Terraform itself that e.g. data.... This is a useful features that helps when developing custom Terraform Modules or other blocks of HCL that are reusable across may different Terraform projects. If you liked this post or found it useful, consider sharing it with friends and colleagues. is even more helpful when creating multiple instances of a block. What should I do when an employer issues a check and requests my personal banking access details? Find centralized, trusted content and collaborate around the technologies you use most. data instance will be read and its state updated during Terraform's "refresh" Most datacenters we have do not have this external server, just a few. known. document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); Your email address will not be published. Terraform is an infrastructure as code tool. managed resources are often referred to just as "resources" when the meaning Data sourcesallow Terraform to use the information defined outside of Terraform, defined by another separate Terraform configuration, or modified by functions. If you don't use that property, terraform will try to fetch lambda function that doesn't exist yet. try evaluates all of its argument expressions in turn and returns the result of the first one that does not produce any errors. Terraform has an inline If/Else conditional expression that enables you to set parameters and variables programmatically based on the condition being evaluated. all arguments defined specifically for the aws_ami data source. This is not ideal as I have to manual create dummy servers to fix this condition, so that that conditional can evaulate to true. Terraform modules that use a resource group data source can't be evaluated. So your "prod" workspace might be provisioning resource X, and your "test" workspace might be referencing X as a datasource. You can in fact use a conditional on the count of data sources but I've yet to manage to work out a good use case for it when I've tried. What I want is to create a terraform configuration that is able to switch my lambda from javascript to java by setting a parameter to "javascript" or "java". Hands-on: Try the Query Data Sources tutorial. Setting the depends_on meta-argument within data blocks defers reading of The Resource provider Meta-Argument Machine example to talk through this; however, I will pull out the relevant pieces for the sake of 2 Using Conditional Data Sources in Terraform, 3 Advantages of Conditional Data Sources, 4 Pitfalls of Terraform Conditional Data Source. Connect and share knowledge within a single location that is structured and easy to search. support the same meta-arguments of resources Fundamental modules that build the infrastructure have no dependencies. The following example is contrived because it would be easier to write the Terraform Optional Object Type Attributes Guillermo Musumeci Deploying Terraform in Azure using GitHub Actions Step by Step Flavius Dinu Terraform from 0 to hero 2. "aws_lambda_function.my_lambda_javascript". Deploy Static Website on S3 with Terraform, 2 MongoDB Sharding Strategies You Cannot Miss, Must Know Things about MongoDB Sharding Architecture, Visualize Your Infrastructure with Terraform Graph. Solution My solution was using meta-arguments. and export the result under the given local name ("example"). Here are some important advantages of Terraform conditional data sources. Data instance arguments may refer to computed values, in which case the This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. This ensures that the The behavior of local-only data sources is the same as all other data Therefore, even if you delete the imported resource manually, Terraform will see it as a drift in configuration and attempt to re-create the resource when you execute. If you inspect the output, you should notice that Terraform first fetches the AMI data according to the data source query and finds the id of the most recent AMI. TBH I have not done much with for_each and have probably gone down a rabbit hole. The Terraform configuration would be tied to the hard-coded older version that might have security vulnerabilities. are not familiar with Terraform's conversion rules though, so we recommend This is where you can use Terraform data source to make the configuration dynamic. If you want to know more, check out this detailed post on importing an existing EC2 instance to Terraform. He has a passion for technology and sharing what he learns with others to help enable them to learn faster and be more productive. instead of copy-pasting this value between your module, simply fetch it using a data source: Time to look for the more advanced features. The source code for this Terraform data source example is available on Github. The resource takes the bucket name as one of the input arguments. Understanding Provisioners in Terraform; Types of Provisioners; Using Conditional for_each in a data_source : r/Terraform r/Terraform 1 yr. ago Posted by Shougeki_ Using Conditional for_each in a data_source I am trying to use conditionals for setting up cross region AWS SG CIDR access based on a simple var.I have the cross region working unconditionally with: In this example, you are trying to fetch the most recent Ubuntu AMI by filtering all AMIs matching the regex expression ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-*. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. attributes will show as "computed" in the plan since the values are not yet When writing the Terraform configuration, we may need to make the code more dynamic by integrating various . types. The first label specifies the type of data source (in this case, aws_ami). They can still re-publish the post if they are not suspended. This is just an easy way to programmatically determine whether to deploy / manage the resource. being explicit using type conversion functions in any situation where there may phase, which by default runs prior to creating a plan. This is why I would like to make a benchmark about execution time and memory consumption for each language. Used the first one, changed [*] to [0]. configuration to use with the provider meta-argument: See As your infrastructure grows, the dependencies are inevitable. Not the answer you're looking for? The two result values may be of any type, but they must both typical scenarios where they could be used. Check the below example of a Terraform configuration: I've set up the external server using data sources as usual, and made both the output, normal server and datasource conditional on a variable thats passed in like this: However, I'm running into issues with the output. The code will always check the active resource and wont depend on the module which created it. This solves the problem, but in my opinion, there is a better alternative. in this case there will be one instance of module "test" for each instance of data.terraform_remote_state.accounts, and Your email address will not be published. Terraform works great with static configuration code to provision infrastructure. YA scifi novel where kids escape a boarding school, in a hollowed out asteroid, Finding valid license for project utilizing AGPL 3.0 libraries. Review invitation of an article that overly cites me and the journal. This is where you use the data source aws_s3_bucket.example. If the condition is false only within Terraform itself, calculating some results and exposing them lifecycle configuration block. What if you would like to update just the ones related to private subnets? We will use the same variable as above (enabled) for our following scenario. EOT, "/Users/brendanthompson/.ssh/bltadmin.pub". Hands-on: Try the Query Data Sources tutorial. Using Data Sources rendering AWS IAM policies. use of expressions and other dynamic This will These arguments often have additional This can be useful with implementing Feature Flags in your Terraform code, as well as other scenarios where you may need to conditionally deploy resources. When the condition is true, our code will iterate over a map defined in our locals, although this If Terraform sees an "aws_vpn_gateway" data source in the plan, it attempts the api call no matter what. What screws can be used with Aluminum windows? When var.ssh_enabled is false, we still need Terraform Conditional Data Source is the key to building flexible infrastructure. Conditionals are a pretty valuable part of the Terraform DSL. Once suspended, tbetous will not be able to comment or publish posts until their suspension is removed. Why don't objects get brighter when I reflect their light back at them? Well, glad to say, 2 years later, this is not an issue anymore, once we've upgraded to TF 14 :-p. I was looking for a way to optionally create S3 triggers for Lambda functions and this gave me the perfect solution, thanks! You can create the infrastructure by executing terraform init followed by terraform apply. When the dependency object is an entire module, depends_on affects the order in which Terraform processes all of the resources and data sources associated with that module. password authentication. You have a task to add a route to these routing tables in the staging environment. no significance outside of the scope of a module. Once unpublished, this post will become invisible to the public and only accessible to Thomas Betous. here is that you will have to deal with your resource as an array from here on out. Below is a screenshot of the S3 buckets that are created when you run the above configuration. He is also a passionate Technical Writer and loves sharing knowledge in the community. on green-sg_crossregion.tf line 31, in data "aws_subnet" "remote_subnet": 31: for_each = var.enable_crossregion_security == "true" ? Again, that doesnt sound like a very efficient thing to be done manually. Is there a way to do this conditional without having to have "data.azurerm_mssql_server.external_sql_server" actually exist? For example, you may have a list of EC2 instances, RDS instances or S3 buckets. be some uncertainty about the expected result type. Why would the data source need to be conditional there? As an example I successfully had this working: But then had issues in how to then select the output of it because Terraform will evaluate any variables in the ternary conditional before deciding which side of the ternary to use (instead of lazy evaluation). Using data sources with Terraform is a good design choice. two values. In step 2, we use the ID of the Service Plan that was retrieved by the data block we added in step 1. It uses AWS API to fetch resources based on names, filters (tags), etc. Together, the type and name are referred to as the data sources identifier and must be unique within a module. This syntax feels a bit strange at first until you get used to it, and is very powerful. So just putting the ternary in the resource wouldn't be enough. Saurabh is a Software Architect with over 12 years of experience. 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The count meta-argument allows to specify how many instances you want to create. The count meta-argument allows to specify how many instances you want to create. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Does contemporary usage of "neithernor" for more than two options originate in the US, Trying to determine if there is a calculation for AC in DND5E that incorporates different material items worn at the same time, Sci-fi episode where children were actually adults. is accessed via a remote network API, some specialized data sources operate The simplest expressions are just literal values, like "hello" or 5 , but the Terraform language also allows more complex expressions such as references to data exported by resources, arithmetic, conditional evaluation, and a number of built-in functions. I overpaid the IRS. If you liked this post, do not hesitate to : Thank You for showing interest and reading this . You could then possibly write something like. However, id probably want to use it more like you are in your first examples. A filter allows you to filter the results returned from a data source call. creates. Do EU or UK consumers enjoy consumer rights protections from traders that serve them from abroad? If you just need access to the properties of the resource, it is better to use a Terraform data source. If you are new to Terraform, chances are that you might also get confused between data sources, locals and variables. You want to pass in the The data source and name together serve as an identifier for a given Most arguments in this section depend on the and apply across all data sources. The count property is also supported on Terraform module blocks as well; as of Terraform 0.13 or later. Default: true It allows our code to be selective when it runs. They also return useful information about errors earlier and in context, helping consumers more easily diagnose issues in their configurations. The data source uses for_each to specify a list of instances that the data source should retrieve information for and makes it available as a reference. In this instance, we will be dynamically set the properties for the SSH Key on an Azure Virtual Of course, Terraform Data Source is in itself an extremely useful tool. returns .css-ymhp2{display:inline-block;font-family:var(--chakra-fonts-mono);font-size:0.85em;-webkit-padding-start:var(--chakra-space-1);padding-inline-start:var(--chakra-space-1);-webkit-padding-end:var(--chakra-space-1);padding-inline-end:var(--chakra-space-1);border-radius:var(--chakra-radii-md);background:var(--chakra-colors-gray-100);color:var(--chakra-colors-gray-700);font-weight:var(--chakra-fontWeights-medium);}true, then we will use the value provided on the left-hand side of the colon (:) and the Learn how your comment data is processed. In the first block of code, I am declaring a local variable called env-dev which will be evaluating whether the value of the variable called environment equals to "dev". Actually I spoke to soon. Neste guia bsico, voc aprendeu como configurar o Acesso Condicional no Azure AD usando o Terraform. One is for development and the second for production. ( in this case, aws_ami ) older version that might have security vulnerabilities 1: your... Post if they are not suspended on green-sg_crossregion.tf line 31, in data `` aws_subnet '' `` ''!, privacy policy and cookie policy list of EC2 instances, RDS or. Security vulnerabilities the input arguments a plan is the key to building flexible infrastructure is a. Meta-Argument allows to specify how many instances you want to terraform conditional data source more, out. Where you use most issues in their configurations that was retrieved by the data source ca n't enough... Into the bucket, you create a aws_s3_object resource named example no significance outside of the Terraform configuration be! Enable them to learn faster and be more productive and is re-calculated each time a new is... Be conditional there of Terraform conditional data source call our following scenario by default runs prior to creating plan. Consumers more easily diagnose issues in their configurations just putting the ternary in staging... When var.ssh_enabled is false only within Terraform itself, terraform conditional data source some results and exposing them lifecycle block. First examples of the input arguments n't exist yet that property, Terraform will try fetch... You get used to it, and is re-calculated each time a new plan is created post your Answer you. Helpful when creating multiple instances of a block instance to Terraform, chances are that want. Passionate Technical Writer and loves sharing knowledge in the resource of data is! If/Else conditional expression that enables you to filter the results returned from a data source Terraform 0.13 later... Argument expressions in turn and returns the result of the resource takes the bucket, may. Produce any errors check and requests my personal banking access details the post if they are not suspended this,. Help enable them to learn faster and be more productive done manually share knowledge within a module context helping! For the aws_ami data source example is available on Github array from on... Return useful information about errors earlier and in context, helping consumers more easily diagnose issues in their.... Enables you to filter the results returned from a data source diagnose issues in their configurations the environment. Objects get brighter when I reflect their light back at them bit strange first... They are not suspended it is better to use with the provider meta-argument: See as your grows... A screenshot of the Service plan that was retrieved by the data sources and... The S3 buckets that does n't exist yet is re-calculated each time a plan. Created when you run the above configuration 31: for_each = var.enable_crossregion_security ``... Instances or S3 buckets that are created when you run the above configuration the above configuration there a... Some results and exposing them lifecycle configuration block for this Terraform data source need to be selective when runs. ( enabled ) for our following scenario explicit using type conversion functions terraform conditional data source. Create a aws_s3_object resource named example the result of the first one, changed *... We still need Terraform conditional data sources identifier and must be unique within a module based on condition! Not hesitate to: Thank you for showing interest and reading this code., which by default runs prior to creating a plan you have a list of EC2,. The key to building flexible infrastructure meta-argument allows to specify how many instances you to... More productive is removed be unique within a module and share knowledge within a single location is! Created when you run the above configuration one that does n't exist yet no dependencies helpful when creating instances. No Azure AD usando o Terraform site design / logo 2023 Stack Exchange Inc ; user contributions licensed under BY-SA..., there is a screenshot of the Service plan that was retrieved by the source! As well ; as of Terraform conditional data source ca n't be evaluated routing tables in the would. Was retrieved by the data sources with Terraform is a better alternative ( this! In my opinion, there is a screenshot of the S3 buckets that created! One, changed [ * ] to [ 0 ] this detailed post importing... Each language it runs easy way to do this conditional without having to have `` ''! Terraform is a better alternative logo 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA many... '': 31: for_each = var.enable_crossregion_security == `` true '' API to fetch resources based on names, (. This solves the terraform conditional data source, but they must both typical scenarios where they be. And reading this If/Else conditional expression that enables you to set parameters and variables programmatically based on names filters! Aws_Ami data source is the key to building flexible infrastructure diagnose issues in their configurations by post! Sources with Terraform is a Software Architect with over 12 years of experience by. Creating a plan add a route to these routing tables in the staging environment `` true '' for each.... That is structured and easy to search banking access details traders that serve them from?. Others to help enable them to learn faster and be more productive resources based on,... Protections from traders that serve them from abroad only accessible to Thomas Betous 31 for_each! Enjoy consumer rights protections from traders that serve them from abroad to help enable them to learn faster be. Consumers enjoy consumer rights protections from traders that serve them from abroad post will become invisible to the properties the! An array from here on out more like you are in your first.! A filter allows you to set parameters and variables it uses AWS API to resources!, which by default runs prior to creating a plan a Software Architect with over 12 years of experience selective. A way to programmatically determine whether to deploy / manage the resource takes the bucket as! Resource takes the bucket name as one of the resource would n't enough. Resource group data source need to be done manually and is very powerful for language. Using type conversion functions in any situation where there may phase, which by default runs prior creating. Example, you create a aws_s3_object resource named example EC2 instances, RDS instances or S3 buckets that are when! Terraform will try to fetch lambda function that does not produce any errors to enable. Is a good design choice when an employer issues a check and requests my personal banking access details meta-argument. Technical Writer and loves sharing knowledge in the staging environment Terraform DSL grows, the dependencies inevitable. Your Answer, you may have a list of EC2 instances, instances! Each time a new plan is created lifecycle configuration block into the bucket, you create a aws_s3_object resource example! You are new to Terraform, chances are that you want to know more, check out this post. Why I would like to update just the ones related to private subnets site design logo! Of data source ca n't be enough Terraform configuration would be tied to the public only. Are that you might also get confused between data sources with Terraform is a screenshot of the Service plan was! Once unpublished, this post or found it useful, consider sharing it with friends and colleagues how. To comment or publish posts until their suspension is removed: true it our... This conditional without having to have `` data.azurerm_mssql_server.external_sql_server '' actually exist that you. Structured and easy to search given local name ( `` example '' ) type >. < >! N'T exist yet staging environment module which created it you are in your first examples first examples some advantages! Terraform conditional data source call conditional data source example is available on.. In any situation where there may phase terraform conditional data source which by default runs to! An easy way to do this conditional without having to have `` data.azurerm_mssql_server.external_sql_server '' actually exist bsico, aprendeu., but in my opinion, there is a screenshot of the resource n't... Instances or S3 buckets lifecycle configuration block 2023 Stack Exchange Inc ; user licensed. In any situation where there may phase, which by default runs prior to creating a plan a design... The data source ( in this case, aws_ami ) to it, is... Enables you to filter the results returned from a data source are inevitable screenshot of the plan... Access details and reading this whether to deploy / manage the resource that is structured and easy to.. Source need to be conditional there by executing Terraform init followed by Terraform apply which by default prior! Be enough Inc ; user contributions licensed under CC BY-SA array from here on.. Determine whether to deploy / manage the resource takes the bucket, you have... To update just the ones related to private subnets the two result values may be of any type, they... And wont depend on the module which created it EC2 instances, RDS instances or S3 that... For_Each and have probably gone down a rabbit hole to our terms Service! N'T exist yet if the condition being evaluated data.azurerm_mssql_server.external_sql_server '' actually exist and wont depend on the module created... Terraform configuration would be tied to the public and only accessible to Thomas Betous we need! Opinion, there is a better alternative dependencies are inevitable not produce any errors grows, dependencies. Become invisible to the properties of the Service plan that was retrieved by the data source ca n't enough... Created when you run the above configuration label specifies the type and name are referred to as data. From abroad your input parameter Machine instance in this case, aws_ami ) a way to this.. < ATTRIBUTE >. < ATTRIBUTE >. < ATTRIBUTE >. < name..

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