Uninstall Anthos Service Mesh

This page explains how to uninstall Anthos Service Mesh.

Uninstall Anthos Service Mesh

Use the following commands to uninstall all Anthos Service Mesh components. These commands also delete the istio-system namespace and all custom resource definitions (CRDs), including any CRDs that you applied.

To prevent interruption of application traffic:
- Downgrade any STRICT mTLS policies to PERMISSIVE.
- Remove any AuthorizationPolicy that may block traffic.
Disable Automatic Management on this cluster (whether you applied it directly or using the fleet-default configuration):
```
  gcloud container fleet mesh update --management manual
```
Disable sidecar auto-injection on your namespace(s), if it is enabled. Run the following command to display namespace labels:
```
 kubectl get namespace YOUR_NAMESPACE --show-labels
```
The output is similar to the following:
```
 NAME   STATUS   AGE     LABELS
 demo   Active   4d17h   istio.io/rev=asm-181-5
```
If you see istio.io/rev= in the output under the LABELS column, remove it:
```
 kubectl label namespace YOUR_NAMESPACE istio.io/rev-
```
If you see istio-injection in the output under the LABELS column, remove it:
```
 kubectl label namespace YOUR_NAMESPACE istio-injection-
```
If you don't see either the istio.io/rev or istio-injection labels, then auto-injection wasn't enabled on the namespace.
Restart your workloads that have sidecars injected to remove the proxies.
If you're using managed Anthos Service Mesh, remove any controlplanerevision resources in the cluster:
```
kubectl delete controlplanerevision RELEASE_CHANNEL -n istio-system
```
Where RELEASE_CHANNEL is the release channel you provisioned, such as asm-managed, asm-managed-rapid, or asm-managed-stable.
Delete webhooks from your cluster, if they exist.
In-cluster Anthos Service Mesh
Delete the validatingwebhooksconfiguration and mutatingwebhookconfiguration.
```
kubectl delete validatingwebhookconfiguration,mutatingwebhookconfiguration -l operator.istio.io/component=Pilot
```
Managed Anthos Service Mesh
A. Delete the validatingwebhooksconfiguration.
```
kubectl delete validatingwebhookconfiguration istiod-istio-system-mcp
```
B. Delete the mutatingwebhookconfiguration.

Note: Use the RELEASE_CHANNEL according to the release channel you provisioned. For example, Regular(istiod-asm-managed), Rapid (istiod-asm-managed-rapid), and Stable (istiod-asm-managed-stable).
```
kubectl delete mutatingwebhookconfiguration istiod-RELEASE_CHANNEL
```
Once all workloads come up and no proxies are observed, then you can safely delete the in-cluster control plane to stop billing. If you deployed a managed control plane, then it is automatically deleted with the previous step.

To remove the in-cluster control plane, run the command below:
```
istioctl x uninstall --purge
```
If there are no other control planes, you can delete the istio-system namespace to get rid of all Anthos Service Mesh resources. Otherwise, delete the services corresponding to the Anthos Service Mesh revisions. This avoids deleting shared resources, such as CRDs.

Delete the istio-system and asm-system namespaces:

 kubectl delete namespace istio-system asm-system --ignore-not-found=true

Check if the deletions were successful:
```
 kubectl get ns
```
The output should indicate a Terminating state and return as shown, otherwise you might have to manually delete any remaining resources in the namespaces and try again.
```
 NAME                 STATUS       AGE
 istio-system         Terminating  71m
 asm-system           Terminating  71m
```
1. If you will delete your clusters, or have already deleted them, ensure that each cluster is unregistered from your fleet.
If you have enabled managed Anthos Service Mesh fleet-default configuration and want to disable it for future clusters, disable it. You can skip this step if you're only uninstalling from a single cluster.
```
 gcloud container hub mesh disable --fleet-default-member-config --project FLEET_PROJECT_ID
```
Where FLEET_PROJECT_ID is the ID of your Fleet Host project.
If you're using managed Anthos Service Mesh, delete the mdp-controller deployment:
```
 kubectl delete deployment mdp-controller -n kube-system
```
Check to see if the istio-cni-plugin-config configmap is present:
```
 kubectl get configmap istio-cni-plugin-config -n kube-system
```
If present, delete the istio-cni-plugin-config configmap:
```
 kubectl delete configmap istio-cni-plugin-config -n kube-system
```
Warning: The network reliability of your GKE cluster may be impacted if you don't delete this configmap.

Delete the istio-cni-node daemonset:

 kubectl delete daemonset istio-cni-node -n kube-system

Upon completion of these steps, all Anthos Service Mesh components, including proxies, in-cluster certificate authorities, and RBAC roles and bindings, are systematically removed from the cluster. During the installation process, a Google-owned service account is granted the necessary permissions to establish the service mesh resources within the cluster. These uninstall instructions don't revoke these permissions, allowing for a seamless re-activation of Anthos Service Mesh in the future.

Uninstall Anthos Service Mesh

Uninstall Anthos Service Mesh

In-cluster Anthos Service Mesh

Managed Anthos Service Mesh