Helm Kubernetes

Helm is for packaging and deploying kubernetes applications

Install

curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3
chmod 700 get_helm.sh
./get_helm.sh

To create helm chart

helm create nodeapp-helm

To create helm package

helm package nodeapp-helm

To deploy helm package

helm install nodeapp-helm

To deploy helm package with custom release name

If you do not mention name, helm chooses random names for release, if you want to have custom name for a relase, run the following command

  helm install --name my-release nodeapp-helm

NOTE - If you get error as follows when you run above command

configmaps is forbidden: User "system:serviceaccount:kube-system:default" cannot list resource "configmaps" in API group "" in the namespace "kube-system"

deploy tiller service account RBAC to avoid above error

  kubectl --namespace kube-system create serviceaccount tiller
  kubectl create clusterrolebinding tiller-cluster-rule --clusterrole=cluster-admin --serviceaccount=kube-system:tiller
  kubectl --namespace kube-system patch deploy tiller-deploy -p '{"spec":{"template":{"spec":{"serviceAccount":"tiller"}}}}'

Upgrade helm release

helm upgrade --set-string image.tag=v2 <release-name> <chart-path>

  helm upgrade --set-string image.tag=v2 nodeapp nodeapp

To list out helm releases which are in deployed state

  helm ls

To list out helm releases which are deployed and deleted state

  helm ls --all

To delete helm release

To delete release completely run following two commands

  helm delete helm-release-name

javahometech/helm