Kubernetes helm chart notes

• Links: Azure/Kubernetes

Install 2019-03

• Ran official curl, and get_helm, all fine
• When deploying chart got an error, tiller not allowed to create namespaces.

• Fixed with command belown and helm init --upgrade

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

Run 2019-02

• helm install --name p1 git/helmchart/ --namespace piet --set "env=DEV" --timeout 600
• Run: helm ls --all p1; to check the status of the release
• run: helm del --purge p1; to delete it
• helm status p1
• helm history p1
• helm rollback p1 3; roll back to version 3
• helm rollback; to last successfully DEPLOYED revision
• helm upgrade --debug --dry-run
• helm upgrade --install

Tricks

• Use checksum of config map to change app annotation and force a new version to be deployed for apps that do not pick up new configs.

  • https://helm.sh/docs/developing_charts/#hooks

  • https://youtu.be/WugC_mbbiWU?t=1043

• hooks

  annotation:
    "helm.sh/hook": " "