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Latest Linux Foundation CKS Exam Practice Questions With ExamTopics

Name: Linux Foundation CKS Exam Questions
Brand: Linux Foundation
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CKS Free Demo Questions

A sample from the full question set for this exam.

QUESTION 1 OF 3

SIMULATION Create a new ServiceAccount named backend - sa in the existing namespace default, which has the capability to list the pods inside the namespace default. Create a new Pod named backend - pod in the namespace default, mount the newly created sa backend - sa to the pod, and Verify that the pod is able to list pods. Ensure that the Pod is running.

QUESTION 2 OF 3

SIMULATION Fix all issues via configuration and restart the affected components to ensure the new setting takes effect. Fix all of the following violations that were found against the API server: - a. Ensure the - - authorization - mode argument includes RBAC b. Ensure the - - authorization - mode argument includes Node c. Ensure that the - - profiling argument is set to false Fix all of the following violations that were found against the Kubelet: - a. Ensure the - - anonymous - auth argument is set to false. b. Ensure that the - - authorization - mode argument is set to Webhook. Fix all of the following violations that were found against the ETCD: - a. Ensure that the - - auto - tls argument is not set to true Hint: Take the use of Tool Kube - Bench

Correct Answer: See the

API server:
Ensure the - - authorization - mode argument includes RBAC
Turn on Role Based Access Control.
Role Based Access Control (RBAC) allows fine - grained control over the operations that different
entities can perform on different objects in the cluster. It is recommended to use the RBAC
authorization mode.
Fix - Buildtime
Kubernetes
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: null
labels:
component: kube - apiserver
tier: control - plane
name: kube - apiserver

namespace: kube - system
spec:
containers:
- command:
+ - kube - apiserver
+ - - - authorization - mode=RBAC,Node
image: gcr.io/google_containers/kube - apiserver - amd64:v1.6.0
livenessProbe:
failureThreshold: 8
httpGet:
host: 127.0.0.1
path: /healthz
port: 6443
scheme: HTTPS
initialDelaySeconds: 15
timeoutSeconds: 15
name: kube - apiserver - should - pass
resources:
requests:
cpu: 250m
volumeMounts:
- mountPath: /etc/kubernetes/
name: k8s
readOnly: true
- mountPath: /etc/ssl/certs
name: certs
- mountPath: /etc/pki
name: pki
hostNetwork: true
volumes:
- hostPath:
path: /etc/kubernetes
name: k8s
- hostPath:
path: /etc/ssl/certs
name: certs
- hostPath:
path: /etc/pki
name: pki
Ensure the - - authorization - mode argument includes Node
Remediation: Edit the API server pod specification file /etc/kubernetes/manifests/kube -
apiserver.yaml on the master node and set the - - authorization - mode parameter to a value that
includes Node.
- - authorization - mode=Node,RBAC
Audit:
/bin/ps - ef | grep kube - apiserver | grep - v grep

Expected result:
'Node,RBAC' has 'Node'
Ensure that the - - profiling argument is set to false
Remediation: Edit the API server pod specification file /etc/kubernetes/manifests/kube -
apiserver.yaml on the master node and set the below parameter.
- - profiling=false
Audit:
/bin/ps - ef | grep kube - apiserver | grep - v grep
Expected result:
'false' is equal to 'false'
Fix all of the following violations that were found against the Kubelet: -
Ensure the - - anonymous - auth argument is set to false.
Remediation: If using a Kubelet config file, edit the file to set authentication: anonymous: enabled
to false. If using executable arguments, edit the kubelet service
file /etc/systemd/system/kubelet.service.d/10 - kubeadm.conf on each worker node and set the
below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
- - anonymous - auth=false
Based on your system, restart the kubelet service. For example:
systemctl daemon - reload
systemctl restart kubelet.service
Audit:
/bin/ps - fC kubelet
Audit Config:
/bin/cat /var/lib/kubelet/config.yaml
Expected result:
'false' is equal to 'false'
2) Ensure that the - - authorization - mode argument is set to Webhook.
Audit
docker inspect kubelet | jq - e '.[0].Args[] | match(" - - authorization - mode=Webhook").string'
Returned Value: - - authorization - mode=Webhook
Fix all of the following violations that were found against the ETCD: -
a. Ensure that the - - auto - tls argument is not set to true
Do not use self - signed certificates for TLS. etcd is a highly - available key value store used by
Kubernetes deployments for persistent storage of all of its REST API objects. These objects are
sensitive in nature and should not be available to unauthenticated clients. You should enable the
client authentication via valid certificates to secure the access to the etcd service.
Fix - Buildtime
Kubernetes
apiVersion: v1
kind: Pod
metadata:
annotations:
scheduler.alpha.kubernetes.io/critical - pod: ""

creationTimestamp: null
labels:
component: etcd
tier: control - plane
name: etcd
namespace: kube - system
spec:
containers:
- command:
+ - etcd
+ - - - auto - tls=true
image: k8s.gcr.io/etcd - amd64:3.2.18
imagePullPolicy: IfNotPresent
livenessProbe:
exec:
command:
- /bin/sh
- - ec
- ETCDCTL_API=3 etcdctl - - endpoints=https://[192.168.22.9]:2379 - -
cacert=/etc/kubernetes/pki/etcd/ca.crt
- - cert=/etc/kubernetes/pki/etcd/healthcheck - client.crt - -
key=/etc/kubernetes/pki/etcd/healthcheck - client.key
get foo
failureThreshold: 8
initialDelaySeconds: 15
timeoutSeconds: 15
name: etcd - should - fail
resources: {}
volumeMounts:
- mountPath: /var/lib/etcd
name: etcd - data
- mountPath: /etc/kubernetes/pki/etcd
name: etcd - certs
hostNetwork: true
priorityClassName: system - cluster - critical
volumes:
- hostPath:
path: /var/lib/etcd
type: DirectoryOrCreate
name: etcd - data
- hostPath:
path: /etc/kubernetes/pki/etcd
type: DirectoryOrCreate
name: etcd - certs
status: {}

QUESTION 3 OF 3

SIMULATION Create a PSP that will prevent the creation of privileged pods in the namespace. Create a new PodSecurityPolicy named prevent - privileged - policy which prevents the creation of privileged pods. Create a new ServiceAccount named psp - sa in the namespace default. Create a new ClusterRole named prevent - role, which uses the newly created Pod Security Policy prevent - privileged - policy. Create a new ClusterRoleBinding named prevent - role - binding, which binds the created ClusterRole prevent - role to the created SA psp - sa. Also, Check the Configuration is working or not by trying to Create a Privileged pod, it should get failed.

Correct Answer: See the

Create a PSP that will prevent the creation of privileged pods in the namespace.
$ cat clusterrole - use - privileged.yaml
- --
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: use - privileged - psp
rules:
- apiGroups: ['policy']
resources: ['podsecuritypolicies']
verbs: ['use']
resourceNames:
- default - psp
- --
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: privileged - role - bind
namespace: psp - test
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: use - privileged - psp
subjects:
- kind: ServiceAccount
name: privileged - sa
$ kubectl - n psp - test apply - f clusterrole - use - privileged.yaml
After a few moments, the privileged Pod should be created.

Create a new PodSecurityPolicy named prevent - privileged - policy which prevents the creation of
privileged pods.
apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
name: example
spec:
privileged: false # Don't allow privileged pods!
# The rest fills in some required fields.
seLinux:
rule: RunAsAny
supplementalGroups:
rule: RunAsAny
runAsUser:
rule: RunAsAny
fsGroup:
rule: RunAsAny
volumes:
- '*'
And create it with kubectl:
kubectl - admin create - f example - psp.yaml
Now, as the unprivileged user, try to create a simple pod:
kubectl - user create - f - <<EOF
apiVersion: v1
kind: Pod
metadata:
name: pause
spec:
containers:
- name: pause
image: k8s.gcr.io/pause
EOF
The output is similar to this:
Error from server (Forbidden): error when creating "STDIN": pods "pause" is forbidden: unable to
validate against any pod security policy: []
Create a new ServiceAccount named psp - sa in the namespace default.
$ cat clusterrole - use - privileged.yaml
- --
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: use - privileged - psp
rules:
- apiGroups: ['policy']

resources: ['podsecuritypolicies']
verbs: ['use']
resourceNames:
- default - psp
- --
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: privileged - role - bind
namespace: psp - test
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: use - privileged - psp
subjects:
- kind: ServiceAccount
name: privileged - sa
$ kubectl - n psp - test apply - f clusterrole - use - privileged.yaml
After a few moments, the privileged Pod should be created.
Create a new ClusterRole named prevent - role, which uses the newly created Pod Security Policy
prevent - privileged - policy.
apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
name: example
spec:
privileged: false # Don't allow privileged pods!
# The rest fills in some required fields.
seLinux:
rule: RunAsAny
supplementalGroups:
rule: RunAsAny
runAsUser:
rule: RunAsAny
fsGroup:
rule: RunAsAny
volumes:
- '*'
And create it with kubectl:
kubectl - admin create - f example - psp.yaml
Now, as the unprivileged user, try to create a simple pod:
kubectl - user create - f - <<EOF
apiVersion: v1
kind: Pod
metadata:
name: pause

0
spec:
containers:
- name: pause
image: k8s.gcr.io/pause
EOF
The output is similar to this:
Error from server (Forbidden): error when creating "STDIN": pods "pause" is forbidden: unable to
validate against any pod security policy: []
Create a new ClusterRoleBinding named prevent - role - binding, which binds the created ClusterRole
prevent - role to the created SA psp - sa.
apiVersion: rbac.authorization.k8s.io/v1
# This role binding allows "jane" to read pods in the "default" namespace.
# You need to already have a Role named "pod - reader" in that namespace.
kind: RoleBinding
metadata:
name: read - pods
namespace: default
subjects:
# You can specify more than one "subject"
- kind: User
name: jane # "name" is case sensitive
apiGroup: rbac.authorization.k8s.io
roleRef:
# "roleRef" specifies the binding to a Role / ClusterRole
kind: Role #this must be Role or ClusterRole
name: pod - reader # this must match the name of the Role or ClusterRole you wish to bind to
apiGroup: rbac.authorization.k8s.io
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
namespace: default
name: pod - reader
rules:
- apiGroups: [""] # "" indicates the core API group
resources: ["pods"]
verbs: ["get", "watch", "list"]

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Get full access to Certified Kubernetes Security Specialist

PDF

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Practice Test

CKS Free Demo Questions

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💻 Practice Test Demo

Get every Linux Foundation exam in one pack

All in One Linux Foundation Exams Pack

More Linux Foundation Certification Exams

LFCS

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