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": " "
```