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Prepare Linux Foundation CKS Exam

With Certified Kubernetes Security Specialist Exam Questions

Last Updated : May 8, 2021
Total Questions : 29
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Latest Linux Foundation CKS Exam Questions

We regularly update our Linux Foundation CKS Exam Questions, following is the glimpse of the latest CKS Exam Questions updated in our Linux Foundation CKS Exam preparation products. Buy Linux Foundation CKS Exam preparation material listed above to avail full set of updated exam preparation material.

SIMULATION

On the Cluster worker node, enforce the prepared AppArmor profile

#include

profile docker-nginx flags=(attach_disconnected,mediate_deleted) {

#include

network inet tcp,

network inet udp,

network inet icmp,

deny network raw,

deny network packet,

file,

umount,

deny /bin/** wl,

deny /boot/** wl,

deny /dev/** wl,

deny /etc/** wl,

deny /home/** wl,

deny /lib/** wl,

deny /lib64/** wl,

deny /media/** wl,

deny /mnt/** wl,

deny /opt/** wl,

deny /proc/** wl,

deny /root/** wl,

deny /sbin/** wl,

deny /srv/** wl,

deny /tmp/** wl,

deny /sys/** wl,

deny /usr/** wl,

audit /** w,

/var/run/nginx.pid w,

/usr/sbin/nginx ix,

deny /bin/dash mrwklx,

deny /bin/sh mrwklx,

deny /usr/bin/top mrwklx,

capability chown,

capability dac_override,

capability setuid,

capability setgid,

capability net_bind_service,

deny @{PROC}/* w, # deny write for all files directly in /proc (not in a subdir)

# deny write to files not in /proc//** or /proc/sys/**

deny @{PROC}/{[^1-9],[^1-9][^0-9],[^1-9s][^0-9y][^0-9s],[^1-9][^0-9][^0-9][^0-9]*}/** w,

deny @{PROC}/sys/[^k]** w, # deny /proc/sys except /proc/sys/k* (effectively /proc/sys/kernel)

deny @{PROC}/sys/kernel/{?,??,[^s][^h][^m]**} w, # deny everything except shm* in /proc/sys/kernel/

deny @{PROC}/sysrq-trigger rwklx,

deny @{PROC}/mem rwklx,

deny @{PROC}/kmem rwklx,

deny @{PROC}/kcore rwklx,

deny mount,

deny /sys/[^f]*/** wklx,

deny /sys/f[^s]*/** wklx,

deny /sys/fs/[^c]*/** wklx,

deny /sys/fs/c[^g]*/** wklx,

deny /sys/fs/cg[^r]*/** wklx,

deny /sys/firmware/** rwklx,

deny /sys/kernel/security/** rwklx,

}

Edit the prepared manifest file to include the AppArmor profile.

apiVersion: v1

kind: Pod

metadata:

name: apparmor-pod

spec:

containers:

- name: apparmor-pod

image: nginx

Finally, apply the manifests files and create the Pod specified on it.

Verify: Try to use commandping, top, sh


SIMULATION

A container image scanner is set up on the cluster.

Given an incomplete configuration in the directory

/etc/Kubernetes/confcontrol and a functional container image scanner with HTTPS endpoint https://acme.local.8081/image_policy

1. Enable the admission plugin.

2. Validate the control configuration and change it to implicit deny.

Finally, test the configuration by deploying the pod having the image tag as the latest.


SIMULATION

Create a network policy named allow-np, that allows pod in the namespace staging to connect to port 80 of other pods in the same namespace.

Ensure that Network Policy:-

1. Does not allow access to pod not listening on port 80.

2. Does not allow access from Pods, not in namespace staging.


SIMULATION

Create a RuntimeClass named untrusted using the prepared runtime handler named runsc.

Create a Pods of image alpine:3.13.2 in the Namespace default to run on the gVisor runtime class.

Verify: Exec the pods and run the dmesg, you will see output like this:-


SIMULATION

Before Making any changes build the Dockerfile with tag base:v1

Now Analyze and edit the given Dockerfile(based on ubuntu 16:04)

Fixing two instructions present in the file, Check from Security Aspect and Reduce Size point of view.

Dockerfile:

FROM ubuntu:latest

RUN apt-get update -y

RUN apt install nginx -y

COPY entrypoint.sh /

RUN useradd ubuntu

ENTRYPOINT ["/entrypoint.sh"]

USER ubuntu

entrypoint.sh

#!/bin/bash

echo "Hello from CKS"

After fixing the Dockerfile, build the docker-image with the tag base:v2

To Verify:Check the size of the image before and after the build.


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