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127 lines
3.6 KiB
Markdown
127 lines
3.6 KiB
Markdown
# Helm
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Package manager for Kubernetes.
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## Table of contents <!-- omit in toc -->
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1. [TL;DR](#tldr)
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1. [Start managing existing resources with a specific helm chart](#start-managing-existing-resources-with-a-specific-helm-chart)
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1. [Further readings](#further-readings)
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1. [Sources](#sources)
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## TL;DR
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```sh
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# List installed plugins.
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helm plugin list
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helm plugin ls
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# Install new plugins.
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helm plugin add https://github.com/author/plugin
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helm plugin install path/to/plugin
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# Update installed plugins.
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helm plugin update plugin-name
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helm plugin up plugin-name
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# Uninstall plugins.
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helm plugin rm plugin-name
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helm plugin remove plugin-name
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helm plugin uninstall plugin-name
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# Manage repositories.
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helm repo list
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helm repo add 'grafana' 'https://grafana.github.io/helm-charts'
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helm repo add 'ingress-nginx' 'https://kubernetes.github.io/ingress-nginx'
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helm repo update
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helm repo update 'keda'
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helm repo remove 'prometheus'
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# Search for specific charts
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helm search hub --max-col-width '100' 'ingress-nginx'
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helm search repo 'grafana'
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helm search repo --versions 'grafana/grafana'
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# Download and extract charts.
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helm pull 'grafana/grafana'
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helm pull 'ingress-nginx/ingress-nginx' --version '4.0.6' \
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--destination '/tmp' \
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--untar --untardir 'extracted/chart'
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# Get the default values of specific charts.
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helm inspect values 'gitlab/gitlab'
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# Install releases
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helm install 'my-gitlab' 'gitlab/gitlab'
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helm upgrade --install 'my-gitlab' 'gitlab/gitlab'
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helm install --atomic --values 'values.yaml' 'my-gitlab' 'gitlab/gitlab'
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helm install --set 'value=key' 'my-gitlab' 'gitlab/gitlab'
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# Install charts without adding their repository.
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helm upgrade --install 'keda' 'keda' \
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--repo 'https://kedacore.github.io/charts' \
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--namespace 'keda' --create-namespace
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# Upgrade deployed releases
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helm upgrade --install 'my-wordpress' 'wordpress'
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helm upgrade --values values.yaml 'my-wordpress' 'wordpress'
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helm upgrade --namespace 'gitlab' --values 'values.yaml' 'gitlab gitlab/gitlab' --dry-run
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helm upgrade --atomic --create-namespace --namespace 'gitlab' --timeout 0 --values 'values.yaml' 'gitlab' 'gitlab/gitlab' --debug
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# Inspect deployed releases' manifest
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helm get manifest 'wordpress'
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```
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## Start managing existing resources with a specific helm chart
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Since `helm` 3.2 it's possible to import/adopt existing resources into a helm release.<br/>
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To achieve this:
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1. create your helm release **leaving out** the needed existing resources
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1. add the following annotation and labels to the existing resources:
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```yaml
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annotations:
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meta.helm.sh/release-name: app-release-name
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meta.helm.sh/release-namespace: app-deploy-namespace-name
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labels:
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app.kubernetes.io/managed-by: Helm
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```
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with `app-release-name` being the release name used to deploy the helm chart and `app-deploy-namespace-name` being the deployment namespace
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```sh
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kubectl annotate "$KIND" "$NAME" "meta.helm.sh/release-name=${RELEASE_NAME}"
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kubectl annotate "$KIND" "$NAME" "meta.helm.sh/release-namespace=$NAMESPACE"
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kubectl label "$KIND" "$NAME" "app.kubernetes.io/managed-by=Helm"
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```
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1. add now the existing resources' manifests to the chart
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1. execute a chart upgrade:
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```sh
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helm upgrade <app-release-name>
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```
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## Further readings
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- [Website]
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- [Kubernetes]
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- [Helmfile]
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## Sources
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All the references in the [further readings] section, plus the following:
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<!-- project's references -->
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[website]: https://helm.sh/
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<!-- in-article references -->
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[further readings]: #further-readings
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<!-- internal references -->
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[helmfile]: helmfile.md
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[kubernetes]: README.md
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<!-- external references -->
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