How to collect Control Plane component logs for an RKE cluster when logging based on determined or selected namespaces

This document (000020959) is provided subject to the disclaimer at the end of this document.

Situation

By default, rancher-logging allows you to collect logs from all the control plane and node components for any clusters. However, you may want to select which namespaces to collect logs from, which for RKE clusters introduces an issue as the control plane components are deployed as containers and are not in any namespaces.

Resolution

The simplest way to resolve this is by using the container_names directive with the logging app when creating the flow. This will allow you to list all the control plane or node components deployed as containers with the RKE clusters.
Below is an example of a cluster flow collecting logs based on a list of selected namespaces, which will not, without the container_names directive, collect the control plane components.
For this example, we have a cluster output cattle-logging-cluster-test-output forwarding logs to an endpoint of our choice, and you will have to do the same to see the logs in your logging infrastructure.

Note: Below is not an exhaustive list of all the RKE control plane containers and system namespaces, but the most common ones.
 
apiVersion: logging.banzaicloud.io/v1beta1
kind: ClusterFlow
metadata:
  name: cattle-logging-cluster-test-flow
  namespace: cattle-logging
spec:
  filters:
  match:
    - select:
         namespaces:
           - kube-janitor
           - kube-node-lease
           - kube-public
           - kube-system
           - calico-system
           - cattle-fleet-system
           - cattle-impersonation-system
           - cattle-system
           - cattle-logging
           - default
           - opa
         container_names:
           - kube-apiserver
           - etcd
           - kubelet
  globalOutputRefs:
    - cattle-logging-cluster-test-output

Cause

The control plane components are deployed as containers for an RKE cluster which makes the logging based on selected namespaces not pick their logs up.

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:000020959
  • Creation Date: 06-Feb-2023
  • Modified Date:06-Feb-2023
    • SUSE Rancher

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