Terraform local exec command output

Terraform local exec command output

GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Perhaps I'm mistaken, but I believed locals functionality to require being defined in a module? Does it look like something similar to you, or am I off-base here?

Yes, it appears there are still some more edge cases in destroy. I have a similar case already, and I'll be taking a closer look asap.

terraform local exec command output

Can I assume here that you're encountering the errors during destroy, though your example only mentions apply? The reference is in a destroy provisioner, and I can't replicate this on apply. If that's the case, then the good news is it is already fixed in master! This prevents it from being added to the destroy graph, the only time the destroy provisioner is evaluated.

There may be some additional details to consider, but we need to get the datasource lifecycle fixed up first. During the 0. In order to retain as much of the functionality of destroy-time provisioners as possible while addressing the design flaws, one of the 0. The forthcoming Terraform 0.

As a consequence of that, the example given in the original framing of this bug will no longer be considered valid in Terraform 0. To get a similar result it will be required to copy the desired value into the resource configuration so that during the destroy phase it can be obtained via selflike this:.

For other resource types some more creative solutions will likely be required, because most resource types don't have an attribute like this triggers where the given values are meaningless to the resource type.

The 0. Similar content will appear in the main 0. Since this broader change has now intentionally made the original reproduction case invalid, I'm going to close this issue. While these new restrictions are inconvenient, they are necessary to fix fundamental problems with how destroy-time provisioners were designed, and so various other issues around ordering of operations during destroy have either already been resolved for 0.

This helps our maintainers find and focus on the active issues. 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.

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We use essential cookies to perform essential website functions, e. We use analytics cookies to understand how you use our websites so we can make them better, e. Skip to content.Provisioners can be used to model specific actions on the local machine or on a remote machine in order to prepare servers or other infrastructure objects for service. Hands-on: To learn about more declarative ways to handle provisioning actions, try the Provision Infrastructure Deployed with Terraform collection on HashiCorp Learn.

Terraform includes the concept of provisioners as a measure of pragmatism, knowing that there will always be certain behaviors that can't be directly represented in Terraform's declarative model. However, they also add a considerable amount of complexity and uncertainty to Terraform usage. Firstly, Terraform cannot model the actions of provisioners as part of a plan because they can in principle take any action.

Secondly, successful use of provisioners requires coordinating many more details than Terraform usage usually requires: direct network access to your servers, issuing Terraform credentials to log in, making sure that all of the necessary external software is installed, etc.

The following sections describe some situations which can be solved with provisioners in principle, but where better solutions are also available. We do not recommend using provisioners for any of the use-cases described in the following sections. Even if your specific use-case is not described in the following sections, we still recommend attempting to solve it using other techniques first, and use provisioners only if there is no other option.

When deploying virtual machines or other similar compute resources, we often need to pass in data about other related infrastructure that the software on that server will need to do its job. The various provisioners that interact with remote servers over SSH or WinRM can potentially be used to pass such data by logging in to the server and providing it directly, but most cloud computing platforms provide mechanisms to pass data to instances at the time of their creation such that the data is immediately available on system boot.

For example:. Many official Linux distribution disk images include software called cloud-init that can automatically process in various ways data passed via the means described above, allowing you to run arbitrary scripts and do basic system configuration immediately during the boot process and without the need to access the machine over SSH. If you are building custom machine images, you can make use of the "user data" or "metadata" passed by the above means in whatever way makes sense to your application, by referring to your vendor's documentation on how to access the data at runtime.

This approach is required if you intend to use any mechanism in your cloud provider for automatically launching and destroying servers in a group, because in that case individual servers will launch unattended while Terraform is not around to provision them. Even if you're deploying individual servers directly with Terraform, passing data this way will allow faster boot times and simplify deployment by avoiding the need for direct network access from Terraform to the new server and for remote access credentials to be provided.

As a convenience to users who are forced to use generic operating system distribution images, Terraform includes a number of specialized provisioners for launching specific configuration management products. We strongly recommend not using these, and instead running system configuration steps during a custom image build process.

For example, HashiCorp Packer offers a similar complement of configuration management provisioners and can run their installation steps during a separate build process, before creating a system disk image that you can deploy many times. If you are using configuration management software that has a centralized server component, you will need to delay the registration step until the final system is booted from your custom image.

To achieve that, use one of the mechanisms described above to pass the necessary information into each instance so that it can register itself with the configuration management server immediately on boot, without the need to accept commands from Terraform over SSH or WinRM. It is technically possible to use the local-exec provisioner to run the CLI for your target system in order to create, update, or otherwise interact with remote objects in that system.

If you are trying to use a new feature of the remote system that isn't yet supported in its Terraform provider, that might be the only option. However, if there is provider support for the feature you intend to use, prefer to use that provider functionality rather than a provisioner so that Terraform can be fully aware of the object and properly manage ongoing changes to it.

Even if the functionality you need is not available in a provider today, we suggest to consider local-exec usage a temporary workaround and to also open an issue in the relevant provider's repository to discuss adding first-class provider support. Provider development teams often prioritize features based on interest, so opening an issue is a way to record your interest in the feature.

Provisioners are used to execute scripts on a local or remote machine as part of resource creation or destruction.GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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Sign in to your account. The most straightforward way to address this would be to allow variables to be used in destroy provisioners. Direct use of passed-in variables does not present the danger of cyclic dependences created by resource references.

A more ambitious alternate solution would be to allow resources to declare arbitrary attributes at create time, which could be referenced at destroy time. This would allow the provisioner or other resources to access values calculated in state before application. Even if the community likes this, it would seem quicker, and not really hacky to allow reference to passed in variables in destroy provisioners.

But now, since the connection block is built using variables, even if the destroy provisionner does not use any variable, it emits a deprecation warning. Hi shaunc. We don't intend to make an exception for referring to variables because within descendant modules a variable is just as likely to cause a dependency as anything else. While it is true that root module variables can never depend on anything else by definition, Terraform treats variables the same way in all modules in order to avoid a situation where a module would be invalid as a descendant module but not as a root module.

We'd be interested to hear what your use-case is for customizing the interpreter via a variable like that. Usually a provisioner's interpreter is fixed by whatever syntax the command itself is written in. It may be more practical to address whatever was causing you to do this in the first place and make it unnecessary to do so. Thanks for the explanation. However, I think that using them in triggers may be exactly what I meant when I talked about "two passes".

I'm curious in your implementation why referring to variables via triggers doesn't cause loops, while referring to them directly does. And whether direct reference could just be syntactic sugar for reference via trigger. Is there a declarative semantic difference between the two? I think I'm running into a similar situation for the same reasons, though perhaps more mundane. Like him, I also understand the concerns around possibly unknown state at destroy-time.

While the documentation currently indicates this should be possible, I'm getting the deprecation warning for the connection block when setting the ssh private key from a variable:. This is problematic because the private key file isn't stored locally in the same place on my local mac as, say, my co-worker's windows laptop.

For example:. It doesn't affect the resource itself, but it is required to act sort of on behalf of the resource, or in the resource's name.

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Relatedly, while not a user-supplied variable, var. While it would technically be possible to hard-code the value of var. To elaborate the example briefly, our vault cluster consists of AWS instances whose names all begin with vault- and end with a portion of the AWS instance ID - so vaultavault-bcdef0 etc.

The value vault obviously will change from stack to stack, depending on the application, but the use of var. Even if we were, that only covers some of the issue. Local environment configuration ie the path to the private key or knife. If I understand it correctly, that's the idea behind terraform.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am working with Terraform provisionar. And i am not able to store the 'local-exec' provisionar output in local variable to use later. I can store it in local file but not in intermediate variable. Unfortunately you can't. The solution I have found is to instead use an external data source block.

You can run a command from there and retrieve the output sthe only catch is that the command needs to produce json to standard output stdout. See documentation here. I hope this is some help to others trying to solve this problem.

Learn more. Asked 1 year, 4 months ago. Active 2 months ago. Viewed 3k times. BMW You can't. There's a few other questions based on this that this would be a duplicate of but don't have time to find them right now.

Given this question is the first hit when searching "terraform local exec output into variable" it would be helpful to either have an explanation in an answer or closure pointing to relevant questions s with the answer. Active Oldest Votes. Jenny Jenny 26 1 1 bronze badge. Sign up or log in Sign up using Google.

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Related 0. Hot Network Questions. Question feed. Stack Overflow works best with JavaScript enabled.The local-exec provisioner invokes a local executable after a resource is created.

This invokes a process on the machine running Terraform, not on the resource. See the remote-exec provisioner to run commands on the resource. Note that even though the resource will be fully created when the provisioner is run, there is no guarantee that it will be in an operable state - for example system services such as sshd may not be started yet on compute resources.

Note: Provisioners should only be used as a last resort. For most common situations there are better alternatives. For more information, see the main Provisioners page.

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It can be provided as a relative path to the current working directory or as an absolute path. It is evaluated in a shell, and can use environment variables or Terraform variables.

It can be provided as as a relative path to the current working directory or as an absolute path. The directory must exist.

terraform local exec command output

The first argument is the interpreter itself. The remaining arguments are appended prior to the command. If interpreter is unspecified, sensible defaults will be chosen based on the system OS. Live Webinar. Create Account.GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. As a result, if quotes are escaped, they're passed with an escape symbol to the underlying command that might not handle it properly. I'm not a windows expert by any means, but because strings require double quotes, I believe you'll need to escape the additional quotes required within your command string.

I don't believe this is a Terraform issue, and it's probably a discussion worth moving to our community forums if you're willing. This helps our maintainers find and focus on the active issues. 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.

terraform local exec command output

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