Null label

For example, if you have 10 instances, there should be 10 different labels. However, if you have multiple different kinds of resources e.

For most purposes, the id output is sufficient to create an ID or label for a resource, and if you want a different ID or a different format, you would instantiate another instance of null-label and configure it accordingly. This feature is intentionally simple and minimally configurable and will not be enhanced to add more features that are already in null-label. All Cloud Posse Terraform modules use this module to ensure resources can be instantiated multiple times within an account and without conflict.

With Terraform 0. This project is part of our comprehensive "SweetOps" approach towards DevOps. We literally have hundreds of terraform modules that are Open Source and well-maintained. Check them out! Security scanning is graciously provided by Bridgecrew. Bridgecrew is the leading fully hosted, cloud-native solution providing continuous Terraform security and compliance. IMPORTANT: We do not pin modules to versions in our examples because of the difficulty of keeping the versions in the documentation in sync with the latest released versions.

We highly recommend that in your code you pin the version to the exact version you are using so that your infrastructure remains stable, and update versions in a systematic way so that they do not catch you by surprise. The table below correctly indicates which inputs are required. Cloud Posse Terraform modules share a common context object that is meant to be passed from module to module.

The context object is a single object that contains all the input values for terraform-null-label. However, each input value can also be specified individually by name as a standard Terraform variable, and the value of those variables, when set to something other than null , will override the value in the context object.

In order to allow chaining of these objects, where the context object input to one module is transformed and passed on to the next module, all the variables default to null or empty collections. The actual default values used when nothing is explicitly set are described in the documentation below. For example, the default value of delimiter is shown as null , but if you leave it set to null , terraform-null-label will actually use the default delimiter - hyphen.

A non-obvious but intentional consequence of this design is that once a module sets a non-default value, future modules in the chain cannot reset the value back to the original default.

Instead, the new setting becomes the new default for downstream modules. Also, collections are not overwritten, they are merged, so once a tag is added, it will remain in the tag set and cannot be removed, although its value can be overwritten. The value in the context object cannot be changed, so that later modules cannot re-enable a problematic tag. Here is a more complex example with two instances using two different labels.

Note how efficiently the tags are defined for both the instance and the security group. Autoscaling group using propagating tagging below full example: autoscalinggroup. See complete example for even more examples. File a GitHub issue , send us an email or join our Slack Community. We are a DevOps Accelerator. We'll help you build your cloud infrastructure from the ground up so you can own it. Then we'll show you how to operate it and stick around for as long as you need us. Work directly with our team of DevOps experts via email, slack, and video conferencing.

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New post summary designs on greatest hits now, everywhere else eventually. Related Hot Network Questions. Stack Overflow works best with JavaScript enabled. Accept all cookies Customize settings. It would be nice to use coalesce here, but we cannot, because it.

Just for standardization and completeness. Create a truncated ID if needed. Calculate length of normal part of ID, leaving room for delimiter and hash. Truncate the ID and ensure a single not double trailing delimiter.

Support usages that disallow numeric characters. Would prefer tr q-z but Terraform does not support it. Probably would have been better to take the hash of only the characters being removed,. Create the short ID by adding a hash to the end of the truncated ID. Context of this label to pass to other label modules.