CKAD Practice Exam - Part 2

Switch to root so you can read the config file:

sudo -i

Get the contents of the config file:

cat /usr/ckad/fluent.conf

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>

Create the ConfigMap in the cluster:

kubectl apply -f fluentd-config.yml

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

sudo -i

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

Create the pod:

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

Verify that the pod starts up:

kubectl get pod counter

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]

Look for the fluentd output files in the output directory:

ls /usr/ckad/log_output