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Helm Basics

⬅️ Back to Kubernetes overview

Add jhidalgo3s helm repository locally, similar to a docker registry.

helm repo add jhidalgo3-github https://jhidalgo3.github.io/helm-charts/

💡 Helm does support reading/writing Helm charts to an OCI registry.

Search repositories for a keyword in charts. E.g. find hello-kubernetes.

helm search repo hello-kubernetes

Install a Helm chart with its latest version under the release name my-hello-kubernetes

helm install my-hello-kubernetes jhidalgo3-github/hello-kubernetes-chart

💡 You can find the chart's source code here: github.com/jhidalgo3/hello-kubernetes.

List your release with the following command.

helm ls

See everything related to the just installed Helm chart based on your releae name.

kubectl get all -l "app.kubernetes.io/instance=my-hello-kubernetes"

Forward the service installed by helm and open it in your browser:

 kubectl port-forward service/my-hello-kubernetes-hello-kubernetes-chart 8080:80

💡 If port forwarding does not work and you are using Kubernetes with support for a LoadBalancer, you can use the LoadBalancer instead during the upgrade or installation of the Helm chart. --set 'service.type=LoadBalancer'

Explore installed Helm chart

What if you want to configure the Helm chart? Surely the default config is not what you were looking for..

Let's set a custom message:

helm upgrade my-hello-kubernetes jhidalgo3-github/hello-kubernetes-chart --set 'configs.MESSAGE=I was here'

For better maintainability and particularly if you have more than one simple message:

echo -e "configs:\n  MESSAGE: I think you are going too fast ... ️🤯️" > values-message.yaml

If you do not have the echo command, create a file that looks like this one.

    configs:
        MESSAGE: I think you are going too fast ... ️🤯️
helm upgrade my-hello-kubernetes jhidalgo3-github/hello-kubernetes-chart -f values-message.yaml

Important Note: Please delete the existing Pod. A new one will be created. After that, you can run the port forward.

💡 Multiple values.yaml files can be provided to a Helm installation

Explore the chart locally:

helm pull jhidalgo3-github/hello-kubernetes-chart --untar

The chart should be available in the file hello-kubernetes-chart-3.0.0.tgz as well as unpacked in the directory hello-kubernetes-chart.

💡 Many other charts are published on artifacthub.io, where they can be inspected directly in the browser.

Helm charts structure

Explain anatomy of Helm CLI

helm help

A few tricks when working with Helm charts List description/info for a chart

helm show chart jhidalgo3-github/hello-kubernetes-chart

List all (default) values for a chart.

helm show values jhidalgo3-github/hello-kubernetes-chart

https://artifacthub.io/ is where a lot of charts and also documentation can be found. A lot of different charts already exist, obviously.

💡 For good charts apart from official ones (if available) are the Bitnami ones: https://artifacthub.io/packages/search?kind=0&org=bitnami

Uninstall

helm uninstall my-hello-kubernetes

💡 Alternative to Helm: kustomize