Disable a Custom Configuration of an Application for a Cluster

Enabled customizations are defined in a ConfigMap, which, in turn, is referenced in the spec.clusterConfigOverrides object of your AppDeployment.

1. Review your current configuration to establish what you want to remove:

   BASH

   kubectl get appdeployment -n ${WORKSPACE_NAMESPACE} kube-prometheus-stack -o yaml

   The output looks similar to this:

   YAML

   apiVersion: apps.kommander.d2iq.io/v1alpha3
   kind: AppDeployment
   metadata:
     name: kube-prometheus-stack
     namespace: ${WORKSPACE_NAMESPACE}
   spec:
     appRef:
       name: kube-prometheus-stack-46.8.0
       kind: ClusterApp
     configOverrides:
       name: kube-prometheus-stack-overrides-attached
     clusterSelector:
       matchExpressions:
       - key: kommander.d2iq.io/cluster-name
         operator: In
         values:
         - attached-cluster1
         - attached-cluster2
     clusterConfigOverrides:
       - configMapName: kps-cluster1-overrides
         clusterSelector:
           matchExpressions:
           - key: kommander.d2iq.io/cluster-name
             operator: In
             values:
             - attached-cluster1
       - configMapName: kps-cluster2-overrides
         clusterSelector:
           matchExpressions:
           - key: kommander.d2iq.io/cluster-name
             operator: In
             values:
             - attached-cluster2

   Here you can see that kube-prometheus-stack has been enabled for the attached-cluster1 and attached-cluster2. There is also a custom configuration for each of the clusters: kps-cluster1-overrides and kps-cluster2-overrides.

2. Edit the file by deleting the configMapName entry of the cluster for which you would like to delete the customization. This is located under the clusterConfigOverrides:

   YAML

   cat <<EOF | kubectl apply -f -
   apiVersion: apps.kommander.d2iq.io/v1alpha3
   kind: AppDeployment
   metadata:
     name: kube-prometheus-stack
     namespace: ${WORKSPACE_NAMESPACE}
   spec:
     appRef:
       kind: ClusterApp
       name: kube-prometheus-stack-46.8.0
     configOverrides:
       name: kube-prometheus-stack-ws-overrides
     clusterSelector:
       matchExpressions:
         - key: kommander.d2iq.io/cluster-name
           operator: In
           values:
           - attached-cluster1
     clusterConfigOverrides:
       - configMapName: kps-cluster1-overrides
         clusterSelector:
           matchExpressions:
           - key: kommander.d2iq.io/cluster-name
             operator: In
             values:
             - attached-cluster1
   EOF

   Compare steps one and two for a reference of how an entry should be deleted.

3. Before deleting a ConfigMap that contains your customization, ensure you will NOT require it at a later time. It is not possible to restore a deleted ConfigMap.
   If you choose to delete it, run:

kubectl delete configmap <name_configmap> -n ${WORKSPACE_NAMESPACE} 

It is NOT possible to delete a ConfigMap that is being actively used and referenced in the configOverride of any AppDeployment.

Verify the Current Configuration of your Application

Refer to the Verify applications help to connect to the managed or attached cluster and check the status of the deployments. 

If you want to know how the AppDeployment resource is currently configured, refer to the Print and review the state of your AppDeployment section.