Im trying to output a resource that has been created conditionally using count. All resources were counted. It worked! My best guess is that this error was caused by a bad upgrade path somewhere between Terraform versions 0.11.x and 0.12.x -- as a fresh config does not encounter the same issue. 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For the record, I hit this issue after I got an error on update (not related with the additional resources in the list). We can specify the number of identical resources to create. Exported value aws_vpc_endpoint_service of aws_vpc_endpoint_service has no indices, documentation/add return types to Attributes Reference, Please do not leave "+1" or "me too" comments, they generate extra noise for issue followers and do not help prioritize the request, If you are interested in working on this issue or have submitted a pull request, please leave a comment. The full configuration I used and the terminal output details are included below. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Alternatively: this may be the result of a strange interaction between how Terraform handles indices and how it passes them to modules -- but it seems as though not every instance of this bug involves the use of a module. privacy statement. #1 Is there a way to make the range function of terraform start from 1 instead of 0 or any other function or way to achieve the end result. Do US citizens need a reason to enter the US? Ran into this issue with v0.12.20 using count to conditionally enable / disable a resource and referencing it elsewhere, was also able to resolve it by setting the count value to something else, refreshing, and re-creating the change before applying again. To see all available qualifiers, see our documentation. Facing the same issue with count on oci provider and just plain null provisioners as well. *.id)}" When you deploy resources with count, there is a count index (starting at zero) which is assigned for each instance of the resource deployed. Physical interpretation of the inner product between two quantum states, what to do about some popcorn ceiling that's left in some closet railing. But what if you need multiple similar infrastructure components (e.g., multiple virtual machines, like a pool of AWS EC2 instances)? Hence, if I get the list from range function which starts from 1, then I can simply use it in other places. With our big configuration language improvements now merged into master I tried out the following configuration on the v0.12.0-alpha2 prerelease build: I initially applied this accepting the default count of 1: I then applied again with an incremented count: and finally I applied again letting the count return to 1, destroying the two instances with index 1: Out of curiousity, I also simplified the configuration as follows to approximate the other example you gave: Since this appears to be fixed in master I'm going to close this out now. 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. Also, when used in a data block, it fetches multiple instances of an object. Basic Syntax The Terraform count is a meta-argument determined by the Terraform language. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. encrypted = lookup(ebs_block_device.value, "encrypted", true) value = "${join(", ", aws_instance.ec2_server. Connect and share knowledge within a single location that is structured and easy to search. I'm going to lock this issue because it has been closed for 30 days . By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. You signed in with another tab or window. [ 0 ] Well occasionally send you account related emails. repeatedly adding step to it until the result is equal to or beyond limit. Each meta-argument allows you to create more than one resource or module with a single configuration block. Can a simply connected manifold satisfy ? It should have created 3 instances, 3 volumes per instance and attached 3 volumes to each instance. Below are some of the frequently asked questions about the count meta-argument. Conclusions from title-drafting and question-content assistance experiments Terraform outputs for resources with count, Terraform Invalid count argument that depends on another resource, Terraform - Count.index and String together. In the example above, the web_servers module is reused to create multiple web server instances using the count meta-argument. It appears to be possible to encounter this if you create a aws_vpc_endpoint resource with count, and the VPCE transitions to "rejected" or "deleted" state outside of Terraform. step, the sequence is complete when the next number is greater than or equal Have a question about this project? Expected behavior a fresh redeploy of the below resources without error. }, tags = merge(map("Name", "${var.app_name}-server-error"), merge(var.tags, var.s3_tags)) This object has one attribute: count.index The distinct index number (starting with 0) corresponding to this instance. Well occasionally send you account related emails. Lets look at some examples that use the count meta-argument. If the count is 1, set associate_public_ip_address to true; else, set associate_public_ip_address to false. 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. Providing the link here. Terraform has two ways to do this: count and for_each. Terraform Version 0.10.8 Terraform Configuration Files Simplifying the configs for the sake of readability. You need to change it to be the following: Thanks for contributing an answer to Stack Overflow! Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. The expression aws_route53_zone.private refers to a list of zero or one items, so in order to return a single ID in this output value you need to decide what the value ought to be in the case where there are no instances of the resource. The best answers are voted up and rise to the top, Not the answer you're looking for? It only takes a minute to sign up. @apparentlymart Looks like I am facing the same issue with TF v0.11.7 as well. volume_size = lookup(root_block_device.value, "volume_size", "gp2") Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Using the count.index like above, is still fragile because each instance is still identified by Terraform using its index and not the string value in the list. How does hardware RAID handle firmware updates for the underlying drives? The range function is primarily useful when working with other collections Also, the count meta-argument supports a whole number moreover makes that many instances of the resource or module. Given that I cannot replicate this issue and the most recent comment is from 2 years ago, I am marking this issue as Closed for the time being. How can kaiju exist in nature and not significantly alter civilization? Pasting some relevant o/p from the log by enabling TF_LOG here. 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: Term meaning multiple different layers across many eras? The count meta-argument has been around for a long time, but for_each is a relative newcomer (introduced in version 0.12). Connect and share knowledge within a single location that is structured and easy to search. Examples > index ( ["a", "b", "c"], "b") 1 Copy I see https://www.hashicorp.com/blog/terraform-0-1-2-preview and https://www.terraform.io/upgrade-guides/0-12.html. How do you manage the impact of deep immersion in RPGs on players' real-life? Terraform offers two resource repetition mechanisms: count and for_each. In blocks where count is set, an additional count object is available in expressions, so you can modify the configuration of each instance. Is it better to use swiss pass or rent a car? ami = var.vpc_config.ec2_ami Ran into this issue as well with v0.12.17 using count to conditionally enable / disable a resource (apply with auto-approve) and was able to resolve it by running plan and apply again (both without auto-approve). The code is: resource "aws_route53_zone" "private" { count = (terraform.workspace == "prod") ? For a negative step, it's complete when less than or equal. For example: Centralized secrets lifecycle management for developers. Is it a concern? Youve subscribed to our newsletter and exclusive offers from KodeKloud! Why is this Etruscan letter sometimes transliterated as "ch"? I'm describing what I did to my environment, using the values from your example. In my case, the fix was to terraform state rm the offending state which linked to the VPCE. kms_key_id = lookup(root_block_device.value, "kms_key_id", data.aws_kms_key.ebs.arn) This is where the count object attribute (i.e., count.index) comes into play. Even though count helps you create multiple similar resource instances, you need to know if it is the right meta-argument for your use case. Not the answer you're looking for? kms_key_id = lookup(ebs_block_device.value, "kms_key_id", data.aws_kms_key.ebs.arn) If Phileas Fogg had a clock that showed the exact date and time, why didn't he realize that he had reached a day early? 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. https://learn.hashicorp.com/tutorials/terraform/expressions?in=terraform/configuration-language#update-your-instance-configuration. 1 : 0 ec2-instance.tf: Ph.D. / Golden Gate Ave, San Francisco / Seoul National Univ / Carnegie Mellon / UC Berkeley / DevOps / Deep Learning / Visualization. These seem to suggest that v0.12.0 was planned for a summer release, is there a new timeline? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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. reverting to 12.7 works without issue. This will be discussed further in the Referencing blocks and block instances section later in this article. One more thing: I see this bug is tagged as service/ec2. We added 1 more instance and modifying the tag for the already existing instance. The count meta-argument can also be used inside data blocks. I have already upvoted this issue. facing similar behavior after upgrading from 12.7 to 12.24 with AWS provider version = "~> 2.25.0". be useful when combined with other collections in collection-manipulation Thanks for reporting this, and thanks for your patience while we got to the bottom of it. It includes video lectures, interactive exercises, and hands-on labs to help you internalize concepts and commands. The range function takes either one, two, or three arguments, with each additional argument overriding what would otherwise be a default behavior. The start and step arguments can be omitted, in which case start defaults With touch and echo, the utility tee enables the remote-exec to run sudo commands while . I believe that I'm also hitting this issue. }, resource "aws_instance" "ec2_server" { This function produces an error if the given value is not present in the list. The examples below demonstrate its usage. Seems to be a core issue with 0.12. https://www.terraform.io/docs/language/meta-arguments/count.html#the-count-object. Would it be possible for you to give this a try with Terraform 0.11 and see if you still see the problem there? device_name = ebs_block_device.value.device_name 2 Answers Sorted by: 11 My suggestion will be to add tags and use name_prefix arguments. dynamic "root_block_device" { Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. We then use this index value to get the name's actual value from local.names List itself. destroyed 3 EBS volumes attached to instance unbounded memory usage if, for example, a very large value were accidentally 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). Below are examples of references for instances that use count. Sponsor Open Source development activities and free contents for everyone. Already on GitHub? Reddit, Inc. 2023. One of the best explanations there is. Do I have a misconception about probability? May I reveal my identity as an author during peer review? 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. functions or for expressions. Cool! The count meta-argument also accepts numeric expressions. Trying to migrate from terraform 11 to 12 and terraform refresh doesn't seem to do anything in regards to getting the data sources to populate prior to an initial terraform12.20 apply. The meta-argument supported in each block type varies. rev2023.7.24.43543. Downgrading to 12.10 fixed the issue. Previously this was NOT and issue on 12.07 or 11.07. Create dynamic resources using 'for_each' or 'for', Terraform Dynamic Block with list intro them. 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. refresh had no effect either. content { It is used to create multiple instances of an infrastructure object when it is used in a resource or module block. InstanceId = aws_instance.ec2_server[count.index].id rev2023.7.24.43543. Have this same issue with Terraform v0.12.18 and creating route table associations with subnets (that ive admittedly manually deleted while testing) using count. If the list has only one value, itll return that value.