Linux Foundation Exam CKS Topic 1 Question 42 Discussion

Actual exam question for Linux Foundation's CKS exam

Question #: 42
Topic #: 1

Context: Cluster:prod Master node:master1 Worker node:worker1

You can switch the cluster/configuration context using the following command:

[desk@cli] $kubectl config use-context prod

Task: Analyse and edit the given Dockerfile (based on theubuntu:18:04image) /home/cert_masters/Dockerfilefixing two instructions present in the file being prominent security/best-practice issues.

Analyse and edit the given manifest file /home/cert_masters/mydeployment.yamlfixing two fields present in the file being prominent security/best-practice issues.

Note:Don't add or remove configuration settings; only modify the existing configuration settings, so that two configuration settings each are no longer security/best-practice concerns. Should you need an unprivileged user for any of the tasks, use usernobodywith user id65535

AExplanation:
1. For Dockerfile:Fix the image version & user name in Dockerfile
2. For mydeployment.yaml : Fix security contexts
Explanation
[desk@cli] $vim /home/cert_masters/Dockerfile
FROM ubuntu:latest # Remove this
FROM ubuntu:18.04 # Add this
USER root # Remove this
USER nobody # Add this
RUN apt get install -y lsof=4.72 wget=1.17.1 nginx=4.2
ENV ENVIRONMENT=testing
USER root # Remove this
USER nobody # Add this
CMD ['nginx -d']

[desk@cli] $vim/home/cert_masters/mydeployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: kafka
name: kafka
spec:
replicas: 1
selector:
matchLabels:
app: kafka
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: kafka
spec:
containers:
- image: bitnami/kafka
name: kafka
volumeMounts:
- name: kafka-vol
mountPath: /var/lib/kafka
securityContext:
{'capabilities':{'add':['NET_ADMIN'],'drop':['all']},'privileged': True,'readOnlyRootFilesystem': False, 'runAsUser': 65535} # Delete This
{'capabilities':{'add':['NET_ADMIN'],'drop':['all']},'privileged': False,'readOnlyRootFilesystem': True, 'runAsUser': 65535} # Add This
resources: {}
volumes:
- name: kafka-vol
emptyDir: {}
status: {}
Pictorial View:
[desk@cli] $vim/home/cert_masters/mydeployment.yaml

Show Suggested Answer

Suggested Answer: A

by Nana at Oct 05, 2023, 04:25 AM

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