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Linux Foundation CKS Exam Sample Questions

Question # 1

Analyze and edit the given Dockerfile FROM ubuntu:latest RUN apt-get update -y RUN apt-install nginx -y COPY entrypoint.sh / ENTRYPOINT ["/entrypoint.sh"] USER ROOT Fixing two instructions present in the file being prominent security best practice issues Analyze and edit the deployment manifest file apiVersion: v1 kind: Pod metadata: name: security-context-demo-2 spec: securityContext: runAsUser: 1000 containers: - name: sec-ctx-demo-2 image: gcr.io/google-samples/node-hello:1.0 securityContext: runAsUser: 0 privileged: True 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

Explanation:
FROM debian:latest
MAINTAINER k@bogotobogo.com
# 1 - RUN
RUN apt-get update && 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 k@bogotobogo.com
---> Using cache
---> e2eef476b3fd
Step 3/7 : RUN apt-get update && 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

---

Question # 2

---

Question # 3

Enable audit logs in the cluster, To Do so, enable the log backend, and ensure that 1. logs are stored at /var/log/kubernetes-logs.txt. 2. Log files are retained for 12 days. 3. at maximum, a number of 8 old audit logs files are retained. 4. set the maximum size before getting rotated to 200MB Edit and extend the basic policy to log: 1. namespaces changes at RequestResponse 2. Log the request body of secrets changes in the namespace kube-system 3. Log all other resources in core and extensions at the Request level. 4. Log "pods/portforward", "services/proxy" at Metadata level. 5. Omit the Stage RequestReceived All other requests at the Metadata level

Explanation:
Kubernetes auditing provides a security-relevant chronological set of records about a cluster. Kube-apiserver performs auditing. Each request on each stage of its execution generates an event, which is then pre-processed according to a certain policy and written to a backend. The policy determines what’s recorded and the backends persist the records.
You might want to configure the audit log as part of compliance with the CIS (Center for Internet Security) Kubernetes Benchmark controls.
The audit log can be enabled by default using the following configuration in cluster.yml:
services:
kube-api:
audit_log:
enabled: true
When the audit log is enabled, you should be able to see the default values at /etc/kubernetes/audit-policy.yaml
The log backend writes audit events to a file in JSONlines format. You can configure the log audit backend using the following kube-apiserver flags:
--audit-log-path specifies the log file path that log backend uses to write audit events. Not specifying this flag disables log backend. - means standard out
--audit-log-maxage defined the maximum number of days to retain old audit log files
--audit-log-maxbackup defines the maximum number of audit log files to retain
--audit-log-maxsize defines the maximum size in megabytes of the audit log file before it gets rotated
If your cluster's control plane runs the kube-apiserver as a Pod, remember to mount the hostPath to the location of the policy file and log file, so that audit records are persisted.
For example:
--audit-policy-file=/etc/kubernetes/audit-policy.yaml \
--audit-log-path=/var/log/audit.log

---

Question # 4

Create a new NetworkPolicy named deny-all in the namespace testing which denies all traffic of type ingress and egress traffic

Explanation:
You can create a "default" isolation policy for a namespace by creating a NetworkPolicy that selects all pods but does not allow any ingress traffic to those pods.
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: default-deny-ingress
spec:
podSelector: {}
policyTypes:
- Ingress
You can create a "default" egress isolation policy for a namespace by creating a NetworkPolicy that selects all pods but does not allow any egress traffic from those pods.
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: allow-all-egress
spec:
podSelector: {}
egress:
- {}
policyTypes:
- Egress
Default deny all ingress and all egress trafficYou can create a "default" policy for a namespace which prevents all ingress AND egress traffic by creating the following NetworkPolicy in that namespace.
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: default-deny-all
spec:
podSelector: {}
policyTypes:
- Ingress
- Egress
This ensures that even pods that aren't selected by any other NetworkPolicy will not be allowed ingress or egress traffic.

---

Question # 5

Create a Pod name Nginx-pod inside the namespace testing, Create a service for the Nginx-pod named nginx-svc, using the ingress of your choice, run the ingress on tls, secure port.

Explanation:
$ kubectl get ing -n
NAME HOSTS ADDRESS PORTS AGE
cafe-ingress cafe.com 10.0.2.15 80 25s
$ kubectl describe ing -n
Name: cafe-ingress
Namespace: default
Address: 10.0.2.15
Default backend: default-http-backend:80 (172.17.0.5:8080)
Rules:
Host Path Backends
---- ---- --------
cafe.com
/tea tea-svc:80 ()
/coffee coffee-svc:80 ()
Annotations:
kubectl.kubernetes.io/last-applied-configuration:
{"apiVersion":"networking.k8s.io/v1","kind":"Ingress","metadata":{"annotations":{},"name":"c
afeingress","
namespace":"default","selfLink":"/apis/networking/v1/namespaces/default/ingress
es/cafeingress"},"
spec":{"rules":[{"host":"cafe.com","http":{"paths":[{"backend":{"serviceName":"teasvc","
servicePort":80},"path":"/tea"},{"backend":{"serviceName":"coffeesvc","
servicePort":80},"path":"/coffee"}]}}]},"status":{"loadBalancer":{"ingress":[{"ip":"169.48. 142.110"}]}}}
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal CREATE 1m ingress-nginx-controller Ingress default/cafe-ingress
Normal UPDATE 58s ingress-nginx-controller Ingress default/cafe-ingress
$ kubectl get pods -n
NAME READY STATUS RESTARTS AGE
ingress-nginx-controller-67956bf89d-fv58j 1/1 Running 0 1m
$ kubectl logs -n ingress-nginx-controller-67956bf89d-fv58j
-------------------------------------------------------------------------------
NGINX Ingress controller
Release: 0.14.0
Build: git-734361d
Repository: https://github.com/kubernetes/ingress-nginx
-------------------------------------------------------------------------------

---

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