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Download DemoVendor: Linux Foundation
Certifications: Linux Foundation Certifications
Exam Code: CKS
Exam Name: Linux Foundation Certified Kubernetes Security Specialist (CKS)
Updated: Dec 28, 2024
Q&As: 46
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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.
A. See the explanation below:
B. PlaceHolder
Correct Answer: A
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: network-policy
spec:
podSelector: {} #selects all the pods in the namespace deployed policyTypes:
-Ingress ingress:
-ports: #in input traffic allowed only through 80 port only
-protocol: TCP port: 80
Service is running on port 389 inside the system, find the process-id of the process, and stores the names of all the open-files inside the /candidate/KH77539/files.txt, and also delete the binary.
A. See explanation below.
B. PlaceHolder
Correct Answer: A
root# netstat -ltnup
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.1:17600 0.0.0.0:* LISTEN 1293/dropbox
tcp 0 0 127.0.0.1:17603 0.0.0.0:* LISTEN 1293/dropbox
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 575/sshd
tcp 0 0 127.0.0.1:9393 0.0.0.0:* LISTEN 900/perl
tcp 0 0 :::80 :::* LISTEN 9583/docker-proxy
tcp 0 0 :::443 :::* LISTEN 9571/docker-proxy
udp 0 0 0.0.0.0:68 0.0.0.0:* 8822/dhcpcd
root# netstat -ltnup | grep ':22'
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 575/sshd
The ss command is the replacement of the netstat command.
Now let's see how to use the ss command to see which process is listening on port 22:
root# ss -ltnup 'sport = :22'
Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port
tcp LISTEN 0 128 0.0.0.0:22 0.0.0.0:* users:("sshd",pid=575,fd=3))
Analyze and edit the given Dockerfile
1.
FROM ubuntu:latest
2.
RUN apt-get update -y
3.
RUN apt-install nginx -y
4.
COPY entrypoint.sh /
5.
ENTRYPOINT ["/entrypoint.sh"]
6.
USER ROOT
Fixing two instructions present in the file being prominent security best practice issues
Analyze and edit the deployment manifest file
1.
apiVersion: v1
2.
kind: Pod
3.
metadata:
4.
name: security-context-demo-2
5.
spec:
6.
securityContext:
7.
runAsUser: 1000
8.
containers:
9.
- name: sec-ctx-demo-2 10.image: gcr.io/google-samples/node-hello:1.0 11.securityContext: 12.runAsUser: 0 13.privileged: True 14.allowPrivilegeEscalation: false
Fixing two fields present in the file being prominent security best practice issues
Don't add or remove configuration settings; only modify the existing configuration settings
Whenever you need an unprivileged user for any of the tasks, use user test-user with the user id 5487
A. See the explanation below:
B. PlaceHolder
Correct Answer: A
FROM debian:latest MAINTAINER [email protected]
# 1 - RUN RUN apt-get update andand DEBIAN_FRONTEND=noninteractive apt-get install -yq apt-utils RUN DEBIAN_FRONTEND=noninteractive apt-get install -yq htop RUN apt-get clean
# 2 - CMD #CMD ["htop"] #CMD ["ls", "-l"]
# 3 - WORKDIR and ENV WORKDIR /root ENV DZ version1 $ docker image build -t bogodevops/demo . Sending build context to Docker daemon 3.072kB
Step 1/7 : FROM debian:latest ---> be2868bebaba
Step 2/7 : MAINTAINER [email protected] ---> Using cache ---> e2eef476b3fd
Step 3/7 : RUN apt-get update andand DEBIAN_FRONTEND=noninteractive apt-get install -yq apt-utils ---> Using cache ---> 32fd044c1356
Step 4/7 : RUN DEBIAN_FRONTEND=noninteractive apt-get install -yq htop ---> Using cache ---> 0a5b514a209e
Step 5/7 : RUN apt-get clean ---> Using cache ---> 5d1578a47c17
Step 6/7 : WORKDIR /root ---> Using cache ---> 6b1c70e87675
Step 7/7 : ENV DZ version1 ---> Using cache ---> cd195168c5c7 Successfully built cd195168c5c7 Successfully tagged bogodevops/demo:latest
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