Override ConfigMap to Restrict Logging to Specific Namespaces

How to override the logging configMap to restrict logging to specific namespaces.

As a cluster administrator, you may have a need to limit, or restrict, logging activities only to certain namespaces. Kommander allows you to do this by creating an override configMap that modifies the logging configuration created in the Create AppDeployment for Workspace Logging procedure.

Prerequisites

• Implement each of the steps listed in Enable Workspace-level Logging.

• Ensure that log data is available before you execute this procedure.

Create and use the Override Entries

To create and use the override configMap entries, follow these steps:

1. Execute the following command to get the namespace of your workspace:

   CODE

   dkp get workspaces

   And copy the value under the NAMESPACE column for your workspace.

2. Set the WORKSPACE_NAMESPACE variable to the namespace copied in the previous step:

   CODE

   export WORKSPACE_NAMESPACE=<WORKSPACE_NAMESPACE>

3. Identify one or more namespaces to which you want to restrict logging.

4. Create a file named logging-operator-logging-overrides.yaml and paste the following YAML code into it to create the overrides configMap:

   CODE

   apiVersion: v1
   kind: ConfigMap
   metadata:
     name: logging-operator-logging-overrides
     namespace: ${WORKSPACE_NAMESPACE}
   data:
     values.yaml: |
       ---
       clusterFlows:
       - name: cluster-containers
         spec:
           globalOutputRefs:
           - loki
           match:
           - exclude:
               namespaces:
               - <your-namespace>
               - <your-other-namespace>

5. Add the relevant namespace values for metadata.namespace and the clusterFlows[0].spec.match[0].exclude.namespaces values at the end of the file, and save the file.

6. Use the following command to apply the YAML file:

   CODE

   kubectl apply -f logging-operator-logging-overrides.yaml

7. Edit the logging-operator AppDeployment to set the value of spec.configOverrides.name to logging-operator-logging-overrides.
   (Refer to Deploy an application with a custom configuration for more information)

   CODE

   dkp edit appdeployment -n ${WORKSPACE_NAMESPACE} logging-operator

   After your editing is complete, the AppDeployment resembles this example:

   CODE

   apiVersion: apps.kommander.d2iq.io/v1alpha3
   kind: AppDeployment
   metadata:
     name: logging-operator
     namespace: ${WORKSPACE_NAMESPACE}
   spec:
     appRef:
       name: logging-operator-3.17.7
       kind: ClusterApp
     configOverrides:
       name: logging-operator-logging-overrides

8. Perform actions that generate log data, both in the specified namespaces and the namespaces you mean to exclude.

9. Verify that the log data contains only the data you expected to receive.