Issues with Fluentd Collecting Unreadable Logs in Kubernetes

Fluentd is deployed in Kubernetes using the fluentd-daemonset-elasticsearch-rbac.yaml file, which contains configurations for RBAC permissions, etc. However, after starting, when checking the Fluentd logs, it shows unread. The reason is an issue with the log locations.

The original log collection configuration is as follows:

        volumeMounts:
        - name: varlog
          mountPath: /var/log
        # When actual pod logs in /var/lib/docker/containers, the following lines should be used.
        # - name: dockercontainerlogdirectory
        #   mountPath: /var/lib/docker/containers
        #   readOnly: true
        # When actual pod logs in /var/log/pods, the following lines should be used.
        - name: dockercontainerlogdirectory
          mountPath: /var/log/pods
          readOnly: true
      terminationGracePeriodSeconds: 30
      volumes:
      - name: varlog
        hostPath:
          path: /var/log
      # When actual pod logs in /var/lib/docker/containers, the following lines should be used.
      # - name: dockercontainerlogdirectory
      #   hostPath:
      #     path: /var/lib/docker/containers
      # When actual pod logs in /var/log/pods, the following lines should be used.
      - name: dockercontainerlogdirectory
        hostPath:
          path: /var/log/pods

Here, the /var/log part cannot be changed, and the issue lies with the dockercontainerlogdirectory part.

It needs to be changed to:

        volumeMounts:
        - name: varlog
          mountPath: /var/log
        # When actual pod logs in /var/lib/docker/containers, the following lines should be used.
        - name: dockercontainerlogdirectory
          mountPath: /var/lib/docker/containers
          readOnly: true
        # When actual pod logs in /var/log/pods, the following lines should be used.
        # - name: dockercontainerlogdirectory
        #   mountPath: /var/log/pods
        #   readOnly: true
      terminationGracePeriodSeconds: 30
      volumes:
      - name: varlog
        hostPath:
          path: /var/log
      # When actual pod logs in /var/lib/docker/containers, the following lines should be used.
      - name: dockercontainerlogdirectory
        hostPath:
          path: /var/lib/docker/containers
      # When actual pod logs in /var/log/pods, the following lines should be used.
      # - name: dockercontainerlogdirectory
      #   hostPath:
      #     path: /var/log/pods