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89 lines
4.1 KiB
Markdown
89 lines
4.1 KiB
Markdown
# Example Guidelines
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## An Example Is
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An example demonstrates running an application/framework/workload on
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Kubernetes in a meaningful way. It is educational and informative.
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Examples are not:
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* Full app deployments, ready to use, with no explanation. These
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belong to [Helm charts](https://github.com/kubernetes/charts).
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* Simple toys to show how to use a Kubernetes feature. These belong in
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the [user guide](https://kubernetes.io/docs/user-guide/).
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* Demos that follow a script to show a Kubernetes feature in
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action. Example: killing a node to demonstrate controller
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self-healing.
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* A tutorial which guides the user through multiple progressively more
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complex deployments to arrive at the final solution. An example
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should just demonstrate how to setup the correct deployment
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## An Example Includes
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### Up front
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* Has a "this is what you'll learn" section.
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* Has a Table of Contents.
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* Has a section that brings up the app in the fewest number of
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commands (TL;DR / quickstart), without cloning the repo (kubectl
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apply -f http://...).
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* Points to documentation of prerequisites.
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* [Create a cluster](https://kubernetes.io/docs/getting-started-guides/) (e.g., single-node docker).
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* [Setup kubectl](https://kubernetes.io/docs/user-guide/prereqs.md).
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* etc.
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* Should specify which release of Kubernetes is required and any other
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prerequisites, such as DNS, a cloudprovider with PV provisioning, a
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cloudprovider with external load balancers, etc.
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* Point to general documentation about alternatives for those
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mechanisms rather than present the alternatives in each example.
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* Tries to balance between using using new features, and being
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compatible across environments.
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### Throughout
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* Should point to documentation on first mention:
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[kubectl](https://kubernetes.io/docs/user-guide/kubectl-overview.md),
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[pods](https://kubernetes.io/docs/user-guide/pods.md),
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[services](https://kubernetes.io/docs/user-guide/services.md),
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[deployments](https://kubernetes.io/docs/user-guide/deployments.md),
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[replication controllers](https://kubernetes.io/docs/user-guide/replication-controller.md),
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[jobs](https://kubernetes.io/docs/user-guide/jobs.md),
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[labels](https://kubernetes.io/docs/user-guide/labels.md),
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[persistent volumes](https://kubernetes.io/docs/user-guide/persistent-volumes.md),
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etc.
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* Most examples should be cloudprovider-independent (e.g., using PVCs, not PDs).
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* Other examples with cloudprovider-specific bits could be somewhere else.
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* Actually show the app working -- console output, and or screenshots.
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* Ascii animations and screencasts are recommended.
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* Follows [config best practices](https://kubernetes.io/docs/user-guide/config-best-practices.md).
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* Shouldn't duplicate the [thorough walk-through](https://kubernetes.io/docs/user-guide/#thorough-walkthrough).
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* Docker images are pre-built, and source is contained in a subfolder.
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* Source is the Dockerfile and any custom files needed beyond the
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upstream app being packaged.
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* Images are pushed to `gcr.io/google-samples`. Contact @jeffmendoza
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to have an image pushed
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* Images are tagged with a version (not latest) that is referenced
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in the example config.
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* Only use the code highlighting types
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[supported by Rouge](https://github.com/jneen/rouge/wiki/list-of-supported-languages-and-lexers),
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as this is what GitHub Pages uses.
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* Commands to be copied use the `shell` syntax highlighting type, and
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do not include any kind of prompt.
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* Example output is in a separate block quote to distinguish it from
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the command (which doesn't have a prompt).
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* When providing an example command or config for which the user is
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expected to substitute text with something specific to them, use
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angle brackets: `<IDENTIFIER>` for the text to be substituted.
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* Use `kubectl` instead of `cluster\kubectl.sh` for example cli
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commands.
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### At the end
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* Should have a section suggesting what to look at next, both in terms
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of "additional resources" and "what example to look at next".
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