Container logging architecture in Kubernetes - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the logging driver for a Docker container.

Kubernetes

docker run --log-driver=[1] nginx

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Ajson-file

Bsyslog

Cnone

Djournald

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a logging driver that disables logging like 'none'.

Using a system logging driver when the default is expected.

The json-file driver is the default logging driver for Docker containers, storing logs as JSON files on the host.

2fill in blank

medium

Complete the command to view logs of a Kubernetes pod named 'webapp'.

Kubernetes

kubectl logs [1]

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Adeployment/webapp

Bpod/webapp

Cservice/webapp

Dnode/webapp

Attempts:

3 left

💡 Hint

Common Mistakes

Using deployment or service names instead of pod names.

Trying to get logs from nodes directly.

The kubectl logs command requires the pod name, so pod/webapp is correct.

3fill in blank

hard

Fix the error in the Fluentd configuration snippet to collect container logs from the correct path.

Kubernetes

<source>
  @type tail
  path [1]
  pos_file /var/log/fluentd-containers.log.pos
  tag kubernetes.*
  format json
</source>

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A/var/log/syslog

B/var/log/pods/*.log

C/var/log/docker/*.log

D/var/log/containers/*.log

Attempts:

3 left

💡 Hint

Common Mistakes

Using pod log paths instead of container log paths.

Using system log paths like syslog.

Fluentd collects container logs from /var/log/containers/*.log in Kubernetes environments.

4fill in blank

hard

Fill both blanks to create a Kubernetes DaemonSet manifest snippet that deploys a logging agent on all nodes.

Kubernetes

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: fluentd
spec:
  selector:
    matchLabels:
      name: fluentd
  template:
    metadata:
      labels:
        name: fluentd
    spec:
      containers:
      - name: fluentd
        image: fluentd:latest
        volumeMounts:
        - name: varlog
          mountPath: [1]
      volumes:
      - name: varlog
        hostPath:
          path: [2]

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A/var/log/containers

B/var/log/pods

C/var/log

D/var/lib/docker/containers

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up container mount path and host path.

Using pod log paths instead of container log paths.

The logging agent mounts /var/log inside the container and maps it to /var/log on the host to access container logs.

5fill in blank

hard

Fill all three blanks to define a Kubernetes ConfigMap for Fluentd with a filter to add Kubernetes metadata.

Kubernetes

apiVersion: v1
kind: ConfigMap
metadata:
  name: fluentd-config
data:
  fluent.conf: |
    <filter kubernetes.**>
      @type [1]
      kubernetes_url [2]
      cache_size [3]
    </filter>

Drag options to blanks, or click blank then click option'

Akubernetes_metadata

Bhttps://kubernetes.default.svc

C1000

Drecord_transformer

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong filter types like record_transformer.

Incorrect Kubernetes API URL.

Setting cache_size to a non-numeric value.

The filter type is kubernetes_metadata to enrich logs with Kubernetes info. The URL points to the Kubernetes API server, and cache_size controls metadata caching.