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Kubernetes Examples

A reference repository of YAML with canonical and as-simple-as-possible demonstrations of kubernetes functionality and features.

See here for a searchable front-end: https://k8s-examples.container-solutions.com/

Why?

At Container Solutions we find we regularly need chunks of YAML to demonstrate something specific, such as:

• A simple deployment

• A simple pod

• A pod with a volume

This might be to do a basic test of an environment, find an example to tinker with, or send to someone to get them going.

Usage

The examples can be used by a kubectl plugin examples. This plugin can be installed by krew:

• first install krew
• Install a custom plugin index: kubectl krew index add cs https://github.com/ContainerSolutions/kubernetes-examples.git
• Install this plugin: kubectl krew install cs/examples

Interactively discover by first selecting the resource type:

$ kubectl examples

filter by resource type

$ kubectl examples Service

filter by resource type and pattern

$ kubectl examples Pod res

If there is only a single match selected by the parameters, it is printed to the stdout. So you can deploy a modified version of a sample by:

$ export KUBE_EDITOR='code -w'
$ kubectl examples Ingress fanout | kubectl create -f - --edit

Sections

broken-* - yamls that exemplify broken kubernetes yaml states

[A-Z][a-zA-Z]* - Example yamls that correspond to resource types.

test - Scripts to test or validate the YAML

Within those folders are either simple/canonical examples, or examples in subfolders that expose particular items of functionality that are highlighted by their yaml path, eg Pod/spec.initContainers/.

If an example is an exemplar of a particular feature but tightly related to another resource, then an absolute folder might be added eg in Service there is Service/Pod.spec.subdomain.

Symlinks are also used to make finding things easier, eg Service/headless-service -> Service/spec.clusterIP.

plugins - a directory following the spec for a Custom krew plugin index

Principles

The examples seek to be:

• As simple as possible to illustrate the functionality

• Self-contained (ie limited to one .yaml file)

• Non-conflicting (eg resource names are unique)

• Clear (eg resource names are verbose and unambiguous)

Release Process

See here

Sources / Thanks To

Official Kubernetes docs

Kubernetes by Example

Practical Kubernetes

Security Examples