CKS Exam Dumps : Certified Kubernetes Security Specialist (CKS)

1. For Dockerfile: Fix the image version & user name in Dockerfile2. 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"]

Text Description automatically generated

[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

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kubesec scan k8s-deployment.yaml

cat <<EOF > kubesec-test.yaml

apiVersion: v1

kind: Pod

metadata:

name: kubesec-demo

spec:

containers:

- name: kubesec-demo

image: gcr.io/google-samples/node-hello:1.0

securityContext:

readOnlyRootFilesystem: true

EOF

kubesec scan kubesec-test.yaml

docker run -i kubesec/kubesec:512c5e0 scan /dev/stdin < kubesec-test.yaml

kubesec http 8080 &

[1] 12345

{"severity":"info","timestamp":"2019-05-12T11:58:34.662+0100","caller":"server/server.go:69","message":"Starting HTTP server on port 8080"}

curl -sSX POST --data-binary @test/asset/score-0-cap-sys-admin.yml

[

{

"object": "Pod/security-context-demo.default",

"valid": true,

"message": "Failed with a score of -30 points",

"score": -30,

"scoring": {

"critical": [

{

"selector": "containers[] .securityContext .capabilities .add == SYS_ADMIN",

"reason": "CAP_SYS_ADMIN is the most privileged capability and should always be avoided"

},

{

"selector": "containers[] .securityContext .runAsNonRoot == true",

"reason": "Force the running image to run as a non-root user to ensure least privilege"

},

// ...