uninstall

04-work-with-helm-charts/04-uninstall-helm-charts.md

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+## Helm Uninstall
+
+## add repo & install a chart 
+```t
+# add & Search Helm Repo
+
+    helm repo add lerndevops https://lerndevops.github.io/helm-charts/
+    helm search repo lerndevops/nginxdemo
+
+# install a chart from repo 
+    helm install sampleapp lerndevops/sampleapp
+    helm install mynginx lerndevops/nginxdemo
+```
+## uninstall Helm Relase - NO FLAGS 
+```t
+# List Helm Releases
+    helm ls
+
+# Uninstall Helm Release
+    helm uninstall <RELEASE-NAME>
+    helm uninstall mynginx 
+    helm uninstall sampleapp
+```
+
+## Uninstall Helm Release with --keep-history Flag
+```t
+# install, upgrade & rollback a Helm Chart
+    helm install mynginx lerndevops/nginxdemo --version 0.1
+    helm upgrade mynginx lerndevops/nginxdemo --version 0.2
+    helm upgrade mynginx lerndevops/nginxdemo --version 0.3
+    helm rollback mynginx 
+
+# List Helm Releases
+    helm list
+    hlem list -f mynginx
+    helm list -f mynginx --superseded
+    helm list -f mynginx --deployed
+
+# List Release History
+    helm history mynginx
+
+# Uninstall Helm Release with --keep-history Flag
+    helm uninstall <RELEASE-NAME> --keep-history
+    helm uninstall mynginx --keep-history
+
+# List Helm Releases which are uninstalled
+    helm list -f mynginx 
+    helm list -f mynginx --uninstalled
+
+Note: We should see uninstalled release
+
+# helm status command
+    helm status mynginx
+
+Note:
+1. works only when we use --keep-history flag
+2. We can see all the details of release with "Status: Uninstalled"
+```
+
+## Rollback Uninstalled Release
+```t
+# List Release History
+    helm history mynginx
+
+# Rollback Helm Uninstalled Release
+    helm rollback <RELEASE> [REVISION] [flags]
+    helm rollback mynginx 3
+
+Note: It should rollback to specific revision number from revision history
+
+# List Helm Releases
+    helm list
+
+# List Kubernetes Resources
+    kubectl get pods
+    kubectl get svc
+
+# List Kubernetes Resources Deployed as part of this Helm Release
+    helm status mynginx --show-resources
+
+# Access Application 
+    http://localhost:31232
+```
+
+## Best Practice for Helm Uninstall
+
+>  **It is recommended to always use `--keep-history Flag` for following reasons**
+   - Keeping Track of uninstalled releases
+   - Quick Rollback if that Release is required