Calculate azure availability zone from count.index - Terraform The count.index attribute represents the unique index number of each object created using the count meta-argument. Manage Similar Resources with Count | Terraform - HashiCorp Developer content { an artificial limit of 1024 numbers in the resulting sequence in order to avoid The count can utilize it with modules and with all resource types. What information can you get with only a private IP address? Since indexes start with 0, we add 1 to the count.index to return 1 & 2 instead of 0 & 1. Would appreciate it if you guys could help me out. rev2023.7.24.43543. vpc_security_group_ids = [module.sg.sg_id] I'm going to lock this issue because it has been closed for 30 days . In my case, the fix was to terraform state rm the offending state which linked to the VPCE. When it loops through the first time the count.index will be 0 pulling the first item in each of the variable lists. For anyone else, below conditional to null wont work because instance ID is a required filed: TEMP RESOLUTION: (there could be another better way) but I solve it like this way, sharing my code for better understanding: Using the Terraform configuration and provider versions included in the initial issue comment, I am unable to replicate this issue. index (list, value) Copy The returned index is zero-based. Powered by Discourse, best viewed with JavaScript enabled. Referring to the block: use .. Not the answer you're looking for? } Can consciousness simply be a brute fact connected to some physical processes that dont need explanation? *.id, count.index)}" Terraform Count [Save your time by using it] - Bits Lovers Let's say I have code as seen below. Providing the link here. Asking for help, clarification, or responding to other answers. threshold = var.cw_alarm_threshold_4xx device_name = ebs_block_device.value.device_name The fact that this is happening during the refresh stage and it is an interaction between a module input variable and a local value is an important insight here that should help us get to the bottom of this. If a resource or module block includes a count argument whose value is a whole number, Terraform will create that many instances. How to use Terraform Count Index Meta-Argument? (with Examples) Any other way to achieve the end result is also accepted as a valid solution. Terraform offers two resource repetition mechanisms: count and for_each. To learn more, see our tips on writing great answers. Is it better to use swiss pass or rent a car? Sum in terraform - Terraform - HashiCorp Discuss terraform-provider-openstack/terraform-provider-openstack#455. range (max) range (start, limit) range (start, limit, step) The start and step arguments can be omitted, in which case start defaults to zero and step defaults to either one or negative one depending on whether limit is greater than or less . for_each = var.ebs_block_device count = var.ec2_instance_count What is count in Terraform? It is commonly used when your instances have some arguments with distinct values. to zero and step defaults to either one or negative one depending on whether The resulting list is created by starting with the given start value and Are you looking to polish your Terraform skills in a real-world environment? Lets see an example below: In the code above, the length function determines the length of the given list (i.e., var.sandboxes). on 12.24 if we destroy an instance in AWS outside of terraform(via console or some other script), and rerun terraform to recreate that instance we are now seeing this behavior when running terraform plan. # InstanceId = "${element(aws_instance.ec2_server. Was the release of "Barbie" intentionally coordinated to be on the same day as "Oppenheimer"? the AWS CLI. +1, I have the same problem with 0.12.16 and 0.12.17 tested with eks module in cluster. Do the subject and object have to agree in number? What would kill you first if you fell into a sarlacc's mouth? Making statements based on opinion; back them up with references or personal experience. To learn more, see our tips on writing great answers. Take a look at the Gruntwork blog, it almost always helps Terraform using count.index in a resource name, What its like to be on the Python Steering Council (Ep. I used it in module where my cron_job module was dependent on lambda module and sometimes I don't want to create lambda but I want to setup cron job, in that case lambda_function_arn block is getting null value which cause terraform failure. Terraform Version 0.10.8 Terraform Configuration Files Simplifying the configs for the sake of readability. be useful when combined with other collections in collection-manipulation which then sounds like deploying volumes with no instance to attach to or erroring out on apply. The text was updated successfully, but these errors were encountered: It seems like Terraform here is evaluating the expression against the prior state rather than the planned state, and so the array length is coming back wrong. Already on GitHub? How did this hand from the 2008 WSOP eliminate Scott Montgomery? Because it sees the index as a resource's identity, to Terraform, this change roughly translates to "rename the bucket at index 1 to morpheus and delete the bucket at index 2." In other words, every time you use count to create a list of resources, if you remove an item from the middle of the list, Terraform will delete every resource . It is has been a few months now since moving to 0.12, that I am encountering these issues regularly for different resources and none of their counts are empty. Lets see how. unbounded memory usage if, for example, a very large value were accidentally comparison_operator = var.cw_comparison_operator Terraform has a count meta-argument to help you configure several similar infrastructure objects. However, I have not personally revisited this since 0.12 was released. Here we want the tag name to be Web-1 and Web-2. Terraform tricks to jump-start deployments on OCI: Iterations, if-then One error message tries to tell us that Terraform thinks aws_ebs_volume.data-ebs-volumes is an empty list (or tuple, or whatever collection). By clicking Sign up for GitHub, you agree to our terms of service and Figures it comes from you :), What its like to be on the Python Steering Council (Ep. InstanceId = aws_instance.ec2_server[count.index].id First of all, I'm quite sure that this is a Terraform bug. What would naval warfare look like if Dreadnaughts never came to be? With 0.11.14, I hit this error in our development environment, and using the same code (isolated) in a sandbox environment, I don't hit the error; but since the element() function will wrap, won't that prevent an index-out-of-range error? facing similar behavior after upgrading from 12.7 to 12.24 with AWS provider version = "~> 2.25.0". I encountered the error with a GCP resource and with a resource of a custom provider. iam_instance_profile = aws_iam_instance_profile.instance_profile.name You have to apply the same trick to aws_instance.data_cluster_worker simultaneously (not sequentially). I would like to count.index to generate the description. Referring to the instance: use .[]. cidrhost Function. Calculate azure availability zone from count.index. kms_key_id = lookup(root_block_device.value, "kms_key_id", data.aws_kms_key.ebs.arn) }, tags = merge(map("Name", "${var.app_name}-server-error"), merge(var.tags, var.s3_tags)) joeminicucci: locals { tld = join (".",tolist ( [reverse (split (".", "$ {var.domain-mappings [count.index]}")) [1],reverse (split (".","$ {var.domain-mappings [count.index]}")) [0]])) } I don't think count.index is available within locals. Seems to be a core issue with 0.12. content { If the given index is greater than the length of the list then the index is "wrapped around" by taking the index modulo the length of the list: Does ECDH on secp256k produce a defined shared secret for two key pairs, or is it implementation defined? Facing the same issue with count on oci provider and just plain null provisioners as well. The count meta-argument also accepts numeric expressions. Can consciousness simply be a brute fact connected to some physical processes that dont need explanation? The count.index attribute starts at 0 for the 1st resource instance, then in the next iteration, it is 1 for the 2nd resource instance, and for the last iteration (i.e., since the count is 3), it is index number 2. Im facing the same issue Make sure to reference the resource which Terraform thinks is empty (here: Now that Terraform is able to run again, refresh the state by running. How feasible is a manned flight to Apophis in 2029 using Artemis or Starship? thanks for the info @apparentlymart ! How can kaiju exist in nature and not significantly alter civilization? We added 1 more instance and modifying the tag for the already existing instance. But what if you need multiple similar infrastructure components (e.g., multiple virtual machines, like a pool of AWS EC2 instances)? @apparentlymart Looks like I am facing the same issue with TF v0.11.7 as well. 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