Disabling Istio

This section describes how to uninstall Istio in a cluster or disable a namespace, or workload.

Uninstall Istio in a Cluster

To uninstall Istio,

1. From the Cluster Explorer, navigate to Installed Apps in Apps & Marketplace and locate the rancher-istio installation.
2. Select rancher-istio in the `istio-system namespace and click Delete
3. After rancher-istio is deleted, you can then select all the remaining apps in the istio-system namespace and click Delete

Result: The rancher-istio app in the cluster gets removed. The Istio sidecar cannot be deployed on any workloads in the cluster.

Note: You can no longer disable and re-enable your Istio installation. If you would like to save your settings for a future install, view and save individual YAMLs to refer back to / reuse for future installations.

Troubleshooting Uninstall: If you didn't follow the uninstall steps, you may encounter a warning during uninstall:

Error: uninstallation completed with 1 error(s): unable to build kubernetes objects for delete: unable to recognize "": no matches for kind "MonitoringDashboard" in version "monitoring.kiali.io/v1alpha1"

This could mean a few things. You either selected all the apps in the istio-system namespace and deleted them at the same time, or you deleted rancher-istio chart dependencies prior to deleting the rancher-istio chart. Since the uninstall did not complete properly, you will have resources remaining in the istio-system namespace that you will need to manually clean up. Another option to avoid manual clean up is to install rancher-istio again, then uninstall it in the correct order.

Disable Istio in a Namespace

1. From the Cluster Explorer view, use the side-nav to select Namespaces page
2. On the Namespace page, you will see a list of namespaces. Go to the namespace where you want to disable and click the select Edit as Form or Edit as Yaml
3. Remove the istio-injection=enabled label from the namespace
4. Click Save

Result: When workloads are deployed in this namespace, they will not have the Istio sidecar.

Remove the Istio Sidecar from a Workload

Disable Istio in the namespace, then redeploy the workloads with in it. They will be deployed without the Istio sidecar.