feat: k8s exercices

kubernetes-exercises/.gitignore

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+
+# Created by https://www.toptal.com/developers/gitignore/api/macos,linux,windows
+# Edit at https://www.toptal.com/developers/gitignore?templates=macos,linux,windows
+
+### Linux ###
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+### macOS ###
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# End of https://www.toptal.com/developers/gitignore/api/macos,linux,windows
+
+# Yaml extracted from Markdown files
+*.md.yaml
+

kubernetes-exercises/.test/extract_all_k8s_from_md.sh

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+#!/bin/bash
+find . -iname "*.md" -exec sh -c "cat {} | sh kubernetes-exercises/.test/parse_k8s_from_md.sh > {}.yaml" \;

kubernetes-exercises/.test/lint_kube.sh

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+#!/bin/bash
+
+# Select all yaml files, except the Helmsman related ones. These are
+# detected by exluding files with filenames starting with "helmfile." or "values-".
+KUBERNETES_RESOURCE_FILES=$(find * -type f \( -iname '*.yml' -or -iname '*.yaml' \) -and ! \( -iname "helmfile.yaml" -or -iname "values-*.yaml" -or -iname "*docker-compose*" \))
+
+excludes=(
+  kubernetes-exercises/deployments-ingress/start/frontend-deployment.yaml
+  kubernetes-exercises/deployments-ingress/start/backend-deployment.yaml
+  kubernetes-exercises/manifests/start/frontend-pod.yaml
+  kubernetes-exercises/services/start/backend-svc.yaml
+  kubernetes-exercises/services/start/frontend-svc.yaml
+  kubernetes-exercises/kubernetes-exercises/old/support-files/traefik-rbac-serviceaccount.yaml
+  kubernetes-exercises/old/ingress-nginx/ingress.yml
+  kubernetes-exercises/old/support-files/traefik-service.yaml
+  kubernetes-exercises/old/extras/08-ingress-gke.md.yaml
+  kubernetes-exercises/old/extras/08-ingress-gke.md.yaml
+  kubernetes-exercises/old/extras/08-ingress-traefik.md.yaml
+  kubernetes-exercises/old/support-files/traefik-rbac-serviceaccount.yaml
+  kubernetes-exercises/old/extras/08-ingress-traefik.md.yaml
+  kubernetes-exercises/old/extras/08-ingress-traefik.md.yaml
+  kubernetes-exercises/old/extras/08-ingress-traefik.md.yaml
+  kubernetes-exercises/old/ingress-gke/ingress.yml
+  kubernetes-exercises/old/ingress-traefik/traefik-rbac.yaml
+  kubernetes-exercises/old/ingress-traefik/traefik-rbac.yaml
+  kubernetes-exercises/old/ingress-traefik/traefik-webui-ingress.yaml
+  kubernetes-exercises/old/ingress-traefik/example-ingress.yaml
+  kubernetes-exercises/old/ingress-traefik/my-ingress.yml
+  kubernetes-exercises/old/ingress-traefik/traefik-ingress-controller.yml
+)
+for exclude in ${excludes[@]}
+do
+   KUBERNETES_RESOURCE_FILES=("${KUBERNETES_RESOURCE_FILES[@]/$exclude}")
+done
+
+# Run all files through kubeconform
+docker run --rm -v ${PWD}:/fixtures -w /fixtures ghcr.io/yannh/kubeconform -summary $KUBERNETES_RESOURCE_FILES

kubernetes-exercises/.test/parse_k8s_from_md.sh

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+#!/bin/bash
+sed -n '/^```[^\n]*k8s/,/^```/p' | sed '/^```[^\n]*k8s/d' | sed -e 's/```/---/g'

kubernetes-exercises/CONTRIBUTION.md

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+# Contribution
+
+## Exercise structure
+
+The exercise should have the following sections:
+
+* Learning goals (bullet points on what the student should learn)
+* Introduction (cleartext description of the exercise)
+* Exercise (Step-by-step instructions on how to solve the exercise)
+* Extras and wrap-up (optional)
+
+When creating a new exercise, you should use the [exercise template](exercise-template.md) as a starting point.
+## Best practices
+
+### Hints
+Use :bulb: `:bulb:` to indicate a hint to the exercise. 
+
+### Dealing with text rich content
+
+When ever you think there is too much text, but that it is necessary, please use the `details` tag to make the text toggleable, by clicking the arrow:
+
+<details>
+    <summary>A Hint</summary>
+    It helps reducing the amount of word overload that we sometimes write
+</details>
+
+The code to make this happen is the following:
+
+```markdown
+<details>
+    <summary>Hint</summary>
+        All markdown in here is hidden in an expandable field
+</details>
+```

kubernetes-exercises/README.md

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+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)][gitpod]
+
+# kubernetes-exercises
+
+A selection of exercises for Kubernetes (k8s).
+
+The exercises are ordered in the way we think it makes sense to introduce Kubernetes concepts.
+
+You can find a summary of many of the commands used in the exercises in the
+[cheatsheet.md](cheatsheet.md).
+
+> :exclamation: The exercises expect that you have access to a kubernetes cluster.
+> Please have a look at the [Setup](#setup) section if that is not the case.
+> There are plenty of free and easy options.
+
+## exercises in suggested order:
+
+- [intro](intro.md)
+- [desired-state](desired-state.md)
+- [manifests](manifests.md)
+- [accessing-your-application](accessing-your-application.md)
+- [services](services.md)
+- [deployments-loadbalancing](deployments-loadbalancing.md)
+- [rolling-updates](rolling-updates.md)
+- [configmaps-secrets](configmaps-secrets.md)
+- [persistent-storage](persistent-storage.md)
+
+## Setup
+
+There are several ways to get a free Kubernetes cluster for running the exercises.
+
+[Amazon][eks], [Google][gke], [Microsoft][aks] and [Oracle][oke] provide various degrees of free managed clusters.
+
+Alternatively, you can set up a local cluster with [Docker
+Desktop][docker-desktop] or [Kind][kind].
+
+Once you have access to a cluster, the following exercises will help you get setup for running the exercises.
+
+- [setup-kubectl-linux](old/exercise_setup/00-setup-kubectl-linux.md) - Skip if
+  you've already installed `kubectl` and have access to a cluster.
+- [setup-namespace](old/exercise_setup/00-setup-namespace.md) - Skip if you've
+  already created a personal namespace and set it as your default.
+
+### kubectl autocompletion
+
+On Linux, using bash, run the following commands:
+
+```shell
+echo "source <(kubectl completion bash)" >> ~/.bashrc
+. ~/.bashrc
+```
+
+The commands above will enable kubectl autocompletion when you start a new bash session and source (reload) bashrc i.e. enable kubectl autocompletion in your current session.
+
+See: [Kubernetes.io - Enabling shell autocompletion][autocompletion] for more info.
+
+# Cheatsheet
+
+A collection of useful commands to use throughout the exercises:
+
+```bash
+kubectl api-resources         # List resource types
+
+
+kubectl explain <resource>    # Show information about a resource
+kubectl explain deployment
+
+
+# List resources in cluster
+kubectl get <resource>                    # In current namespace
+kubectl get <resource> -n <namespace>     # In specific namespace
+kubectl get <resource> --all-namespaces   # In all namespaces
+kubectl get <resource> -o wide            # Add extended information
+kubectl get <resource> -o yaml            # output in YAML format
+kubectl get <resource> -o json            # output in JSON format
+
+# Example
+kubectl get pods [-n abc|--all-namespaces] [-o wide|yaml|json]
+```
+
+See:
+[kubectl - Cheat Sheet](https://kubernetes.io/docs/reference/kubectl/cheatsheet/)
+for a more extended overview of the `kubectl` command.
+
+[eks]: https://aws.amazon.com/ecs/pricing/
+[gke]: https://cloud.google.com/kubernetes-engine/pricing#cluster_management_fee_and_free_tier
+[aks]: https://azure.microsoft.com/en-us/pricing/free-services/
+[oke]: https://www.oracle.com/cloud/free/#free-cloud-trial
+[docker-desktop]: https://docs.docker.com/desktop/
+[kind]: https://kind.sigs.k8s.io/
+[autocompletion]: https://kubernetes.io/docs/tasks/tools/install-kubectl/#enabling-shell-autocompletion