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kubernetes-katas

A selection of exercises for Kubernetes (K8s).

The exercises are ordered in the way we think it makes sense to introduce Kubernetes concepts.

There are three variants of the ingress exercise - one of them is Google Kubernetes Engine (gke) specific, whereas the two others are generic and should work on any Kubernetes cluster.

You can find a summary of many of the commands used in the exercises in the cheatsheet.md.

Setup

• 00-setup-kubectl-linux - Skip if you've already installed kubectl and have access to a cluster.
• 00-setup-namespace - Skip if you've already created a personal namespace and set it as your default.

Exercises

• 01-pods-deployments.md

• 02-service-discovery-and-loadbalancing.md

• 03-rolling-updates.md

• 04-secrets-configmaps.md

• 05-storage.md

• 06-ingress-gke.md

• 06-ingress-nginx.md

• 06-ingress-traefik.md

• 07-healthchecks.md

• 08-helm-package-manager.md

• 09-secrets-ssl-certs-in-nginx.md

• Setup your own cluster with kubeadm

• Spinup a Sock-Shop application with Grafana and Prometheus monitoring

kubectl autocompletion

On Linux, using bash, run the following commands:

$ 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 for more info.

Cheatsheet

A collection of useful commands to use throughout the exercises:

$ 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 for a more extended overview of the kubectl command.

Auto-completion

See: kubectl - Autocomplete