// it's contained within a module that has "count" or "for_each" set. // module that contains the provider configuration. The intent of this structure is to give a caller access to a similar level of detail as is available to expressions within the configuration itself. The following example illustrates the structure of a : The translation of attribute and output values is the same intuitive mapping from HCL types to JSON types used by Terraform's jsonencode function. // Included only if the address has changed, e.g. Output values from child modules arent accessible. Resources: 0 added, 0 changed, 0 destroyed. see any changes that are required for your infrastructure. The terraform output command is used to extract the value of Respond to the confirmation prompt with a yes. Use the lb_url output value with the -raw flag to cURL the load balancer Outputs are also the only way Use terraform output to query the database password by name, and notice that You may now begin working with Terraform. To avoid excessive repetition, we've split the complete format into several discrete sub-objects, described under separate headers. You can add output declarations anywhere in your Terraform configuration files. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Terraform won't accept variable default interpolation or handle layered interpolations. + lb_url = "http://lb-5YI-project-alpha-dev-2144336064.us-east-1.elb.amazonaws.com/", + vpc_id = "vpc-004c2d1ba7394b3d6". Initialize your configuration. It can also, when run with -out=, write a much more detailed binary plan file, which can later be used to apply those changes. However, the It will read the latest data from each resource and then update all of the outputs in terms of those updates, which includes re-evaluating your output expressions to incorporate any changes. The variable name part of the format is the same as the variables declared in the variables.tf file. // state. Output values are similar to return values in programming languages. This description terraform plan and terraform apply. Set for detailed guidance. For Terraform state files (including when no path is provided), This way, we can pass the value to the parent module or display it to the end-user if its an output of the root module. If the user gave a registry source address then this is the, // final location of the module as returned by the registry, after, // "expressions" describes the expressions for the arguments within the. Use the Terraform Command Line Interface (CLI) to manage infrastructure, and interact with Terraform state, providers, configuration files, and Terraform Cloud. A child module can use outputs to expose a subset of its resource attributes This tutorial assumes that you are familiar with the Terraform workflow. Note: This tutorial assumes that you are using a tutorial-specific Our terraform plan shows 7 new resources to be added and displays the changes to our three output values declared in the root module. Debug Output. // "constant_value" is set only if the expression contains no references to, // other objects, in which case it gives the resulting constant value. Next, query an individual output by name. Terraform will perform the actions described above. We will increment the minor version, e.g. Does a summoned creature play immediately after being summoned by a ready action? Resources: 0 added, 0 changed, 46 destroyed. We saw how this was handled in the main.tf file of the root module. To use outputs of nested modules from parent modules, we have to reference them as: For example, to reference the output value instance_public_ip that we have declared above in a module named aws_web_server_instance from its parent module, we have to use: Lets examine how we can use all this in a real-world example. // "proposed_unknown" is a representation of the attributes, including any, // potentially-unknown attributes. // error_message argument of the failing condition. This can be used to inspect a plan to ensure that the planned operations are expected, or to inspect the current state as Terraform sees it. Hands-on: Try the Output Data From machine-readable format. The Terraform CLI output is designed to be parsed by humans. tutorials first. terraform output command to query all of them. We are not // "instance_key" is included for resources only and specifies the, // resource-level instance key, which can either be a number or a. Since we have successfully applied our plan, we can now access these output values at will. // provider for the type-specific arguments described in "expressions". This time, the new subnet needs to be defined in a completely separate Terraform configuration that has its own state. // "expressions" describes the provider-specific content of the, // configuration block, as a block expressions representation (see section, // "root_module" describes the root module in the configuration, and serves. The semantics of this version are: We will introduce new major versions only within the bounds of $ terraform destroy sensitive output, which we then use in a resource attribute. When summarizing checks in a UI, we recommend preferring to list only the Before moving on, destroy the infrastructure you created in this tutorial to This common representation is not suitable for all use-cases because it loses information compared to the data structures it is built from. N/A. again to reinitialize your working directory. Check the official documentation about these arguments and how to set them in detail, After declaring our input variables, we can utilize them in modules by referencing them like this, where matches the label following the. We've all been there, we just deployed something to production and broke EVERYTHING. The lb_url output uses string Usually, we refer to them as just variables in the context of Terraform. configurations, and with other tools and automation. terraform plan will not render outputs. the top-level object instead to serve as a placeholder so that the user can flag for JSON-formatted If you are using Terraform Cloud, you can also find a table of your configuration's outputs on your workspace's overview page. // when it compared the most recent state to the prior saved state. Output values make information about your infrastructure available on the Even more, we compared input and output variables and examined multiple use cases where the use of outputs is helpful. We define three output values for our root module, and we expect to see them at the command line after our infrastructure is provisioned. Is it known that BQP is not contained within NP? maintainers understand the purpose of the additional dependency. Study the complete list of study materials (including docs) in the Certification Prep guides. This can be used to inspect a plan to ensure You can use the result of any Terraform // "resolved_source" is the resolved source address of the module, after, // any normalization and expansion. // "checks" describes the partial results for any checkable objects, such as, // resources with postconditions, with as much information as Terraform can, // recognize at plan time. argument on output declarations is used to define dependencies explicitly when this is necessary. // Connection info will not be included here. Affected Resource(s) random_password. console. Some of the infrastructure in this tutorial may not qualify for briefly describe the purpose of each value using the optional description displayed to the user; in a child module, it can be used to access the output's Before moving on, destroy the infrastructure you created in this tutorial. We notice that when calling the module aws_web_server_instance, we are passing two expressions using output values from the aws_web_server_vpc module with the notation module.. we have seen earlier. You can parse the output using a JSON command-line parser such as jq: $ terraform output -json instance_ips | jq -r '. the root module. Hands-on: Try the Output Data From Terraform tutorial. // - "read_because_dependency_pending": For a data resource, Terraform, // cannot read the data during the plan phase because the data, // resource depends on at least one managed resource that also has, // If there is no special reason to note, Terraform will omit this, // "resource_drift" is a description of the changes Terraform detected. I want to print values of variables in "plan" stage. characters. However, you must still keep your Terraform state secure to avoid For every variable, we have the option to set some arguments such as, . Running module... // "message" is the string that resulted from evaluating the. It creates and configures the web server instance accordingly. Terraform Cloud is a platform that you can use to Consider including a comment when you use this option to explain why this is necessary. Redirecting to https://www.terraform.io/docs/cli/commands/show.html (308) "Deposed" objects are not reflected in this structure at all; in plan representations, you can refer to the change representations for further details. For example, if you have an EC2 instance or a VM deployed in your . Study for the Terraform Associate (003) exam by following these tutorials. // "action_reason" is some optional extra context about why the, // actions given inside "change" were selected. If you are new to Terraform, complete the Get Started collection first. module has an output declared as sensitive and a module call with a We can leverage the, To get the JSON-formatted output, we can use the, This is quite useful when we want to pass the outputs to other tools for automation since JSON is way easier to handle programmatically. Additionally, we can query individual output values by name like this. Cloud workflows. Checking the value parameter of each block, we notice that all of them are coming from output values of the two child modules, and by declaring them as output values of the root module, we are able to pass them through to the command line. The JSON output format consists of the following objects and sub-objects: State does not have any significant metadata not included in the common values representation, so the uses the following format: A plan consists of a prior state, the configuration that is being applied to that state, and the set of changes Terraform plans to make to achieve that. Output values have several uses: confirmation prompt with yes. We encourage you also to explorehow Spacelift makes it easy to work with Terraform. When Terraform plans to make changes, it prints a human-readable summary to the terminal. output declarations to document the intent and content of the output. // The current set of possible values is: // - "replace_because_tainted": the object in question is marked as. This can be used to inspect a plan to ensure that the planned operations are expected, or to inspect the current state as Terraform sees it. This blog post will deep dive into how Terraform handles output and how we can leverage and use output values efficiently across our Terraform projects. Because the output values of a module are part of its user interface, you can valid identifier. In a parent module, outputs of child modules are available in expressions as just scan the list for "delete" to recognize all three situations, // where the object will be deleted, allowing for any new deletion. This way, we can reuse Terraform modules while assigning custom values based on our needs. work with complex-typed values such as objects. In the context of Terraform, we refer to output values as just outputs for simplicity. Terraform only renders and displays outputs when executing terraform apply and not when executing terraform plan. This is where the terraform_remote_state data sources come into play. Different, // kinds of object will have different additional properties inside the. to create a URL from the load balancer's domain name. Just as with value could still display in the CLI output for other reasons, like if the "The server's root volume is not encrypted. Now that you know how to use Terraform outputs, check out the following the Terraform 1.0 Compatibility Promises. In practice, this is a good use case when we would like to pass values to other Terraform modules or automation tools without exposing them to the intermediate users. Note that Terraform wont redact sensitive output values when you query a specific output by name. to a parent module. An output can be marked as containing sensitive material using the optional export TF_VAR_ami=ami-0d26eb3972b7f8c96. Checking the. The terraform output command by default displays in a human-readable format, which can change over time to improve clarity. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. It can be used to show the values of output variables after a successful terraform apply command has been run. Important Factoids. If you forget, other. because it assumes that an automation tool will use the output. See the terraform show documentation for more details. command line, and can expose information for other Terraform configurations to It can also convert state files to the same format, to simplify data loading and provide better long-term compatibility. For every variable, we have the option to set some arguments such as default, type, description, validation, sensitive, and nullable. When defining output values, we have a couple of options that might help us better define and organize them. Expand Documentation Overview Starting with version 0.14, Terraform wraps string outputs in quotes by Add the following definitions to outputs.tf. Terraform will redact sensitive outputs when planning, applying, or destroying running. data.terraform_remote_state.terraform_output.outputs.vpc_id, Although this option is handy for some use cases, it also has some caveats. -raw - If defined, Terraform will change the specified output value to a string and show that string right to the Output, without any specific format.