Table of Contents

1. Challenge

   Create a ConfigMap to Store the fluentd Configuration

   1. Switch to root so you can read the config file:

      sudo -i
      

   2. Get the contents of the config file:

      cat /usr/ckad/fluent.conf
      

   3. Create a descriptor for the ConfigMap with vi fluentd-config.yml:

      apiVersion: v1
      kind: ConfigMap
      metadata:
        name: fluentd-config
      data:
        fluent.conf: |
          <source>
            type tail
            format none
            path /var/log/1.log
            pos_file /var/log/1.log.pos
            tag count.format1
          </source>
      
          <source>
            type tail
            format none
            path /var/log/2.log
            pos_file /var/log/2.log.pos
            tag count.format2
          </source>
      
          <match **>
            @type file
            path /var/logout/count
            time_slice_format %Y%m%d%H%M%S
            flush_interval 5s
            log_level trace
          </match>
      

   4. Create the ConfigMap in the cluster:

      kubectl apply -f fluentd-config.yml
      

2. Challenge

   Create the Pod Descriptor

   1. Switch to root so you can work with the descriptor file:

      sudo -i
      

   2. Edit the descriptor file with vi /usr/ckad/adapter-pod.yml:

      apiVersion: v1
      kind: Pod
      metadata:
        name: counter
      spec:
        containers:
        - name: count
          image: busybox
          args:
          - /bin/sh
          - -c
          - >
            i=0;
            while true;
            do
              echo "$i: $(date)" >> /var/log/1.log;
              echo "$(date) INFO $i" >> /var/log/2.log;
              i=$((i+1));
              sleep 1;
            done
          volumeMounts:
          - name: varlog
            mountPath: /var/log
        - name: adapter
          image: k8s.gcr.io/fluentd-gcp:1.30
          env:
          - name: FLUENTD_ARGS
            value: -c /fluentd/etc/fluent.conf
          volumeMounts:
          - name: varlog
            mountPath: /var/log
          - name: config-volume
            mountPath: /fluentd/etc
          - name: logout
            mountPath: /var/logout
        volumes:
        - name: varlog
          emptyDir: {}
        - name: config-volume
          configMap:
            name: fluentd-config
        - name: logout
          hostPath:
            path: /usr/ckad/log_output
      

3. Challenge

   Create the Pod in the Cluster and Make Sure It Is Working

   1. Create the pod:

      kubectl apply -f /usr/ckad/adapter-pod.yml
      

   2. Verify that the pod starts up:

      kubectl get pod counter
      

   3. You can also verify that everything is working by checking the output directory on the worker node. Log in to the worker from the master:

      ssh [email protected]
      

   4. Look for the fluentd output files in the output directory:

      ls /usr/ckad/log_output