Kubernetes Tools

Kubernetes Labels Generator

Generate valid Kubernetes labels following recommended naming conventions, with invalid-character checking.

Fill in common label categories - this tool generates a valid labels block and flags any values that don't meet Kubernetes' character rules.

app.kubernetes.io/name

app.kubernetes.io/version

app.kubernetes.io/component

environment

Custom Labels

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Labels are how Services and Selectors find the right Pods - see the Kubernetes Selector Builder to build a matching selector for these labels.

What Are Kubernetes Labels?

Labels are key-value pairs attached to Kubernetes objects, used to organize and select subsets of resources - Kubernetes itself recommends a standard set like app.kubernetes.io/name and app.kubernetes.io/version for consistency across tools.

Why Use This Tool?

Label keys and values have specific character rules (alphanumerics, -, _, and ., with a 63-character limit for values) - an invalid label causes kubectl apply to reject the whole manifest. This tool checks your values against those rules.

How to Use It

Fill in common label values: app name, environment, version, and component.
Add any custom labels.
Copy the generated labels block - any invalid values are flagged before you copy.

Limitations

This checks the character-format rules for label keys/values - it does not check whether a specific label is semantically meaningful for your setup beyond following Kubernetes' own recommended label conventions.

Frequently Asked Questions

Values can be up to 63 characters of letters, numbers, -, _ and ., starting and ending with a letter or number. Keys follow the same rule, with an optional DNS-style prefix such as app.kubernetes.io/.

app.kubernetes.io/name, instance, version, component, part-of and managed-by. Tools and dashboards understand them.

Labels are short values used to select and group resources. Annotations hold longer, non-identifying information and cannot be used in selectors.