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| Section | Weight | Objectives |
|---|---|---|
| System Hardening | 15% | - Enable audit logging - Kernel defaults and parameters using sysctl - Modify host components to improve security - Understand the concept of OPA (Open Policy Agent) and Gatekeeper |
| Minimize Microservice Vulnerabilities | 20% | - Use PSP to enforce security controls - Use AppArmor or seccomp profiles to constrain container behavior - Configure network policies for namespace isolation - Understand the principle of immutable containers - Set appropriate security contexts for pods and containers - Use OPA Gatekeeper to enforce security controls |
| Cluster Setup | 10% | - Use Pod Security Policies to control security-related pod behaviors - Manage sensitive information in clusters - Use Cis benchmarks to check Kubernetes cluster settings - Understand the security implications of embedding cloud provider flags - Implement Pod-to-Pod encryption using mTLS or WireGuard - Configure TLS certificates and minimum version for etcd - Use role-based access control (RBAC) to minimize exposure |
| Cluster Hardening | 15% | - Minimize admission of containers without a security context - Minimize admission of containers with raw block devices - Minimize admission of containers with capabilities assigned - Minimize admission of containers with added capabilities - Minimize admission of privileged containers - Minimize admission of containers with FlexVolume volumes - Minimize admission of containers with sharing the host process namespace - Minimize admission of containers that allow host namespaces - Minimize admission of containers without seccomp profiles - Minimize admission of containers without AppArmor profile - Minimize admission of containers with hostPath volumes - Minimize admission of containers with allowPrivilegeEscalation - Minimize admission of containers with sharing the host IPC namespace - Minimize admission of containers with sharing the host network namespace |
| Supply Chain Security | 20% | - Sign container images and verify signatures - Use distroless images for static workload - Understand image security scanning and its workflow - Use image admission controllers to prevent use of untrusted images - Understand the software supply chain best practices - Understand the container build process - Use static analysis tools to detect vulnerabilities - Minimize base image footprint |
| Monitoring, Logging, and Runtime Security | 20% | - Minimize the attack surface using container health indicators - Perform behavioral analytics to detect malicious activity - Falco - container security monitoring and threat detection - Understand and monitor network traffic - Detect threats at the container level - Audit and detect logs and events for anomalies |
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NEW QUESTION # 17
You're working with a Kubernetes cluster where you need to enforce a secure supply chain. You have a Kubernetes deployment that utilizes a container image from a specific registry. How would you configure your Kubernetes cluster to only allow images from this registry to be used in deployments?
Answer:
Explanation:
Solution (Step by Step) :
1. Create a PodSecurityPolicy (PSP):
- A PSP is a policy that enforces security restrictions on pods. We will use it to restrict image pulls to a specific registry.
- create a PSP YAML file.
2. Define Allowed Registries: - Within the 'spec' of your PSP, create a field 'seLinux' and then define the allowed registries within the 'seLinux' field. - Example:
3. Apply the PSP: - Apply the PSP to your cluster using kubectl apply -f restricted-registry-psp.yaml' 4. Create a Service Account: - Create a service account that will be allowed to run pods with this PSP:
5. Bind the PSP to the Service Account: - Add the 'securityContext' field to your deployment and specify the PSP you just created:
- Apply the deployment: bash kubectl apply -f deploymentyaml - Now, the deployment will only be able to pull images from the specified registry-
NEW QUESTION # 18
SIMULATION
Create a new NetworkPolicy named deny-all in the namespace testing which denies all traffic of type ingress and egress traffic
Answer:
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 traffic
You 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.
NEW QUESTION # 19
You are tasked with hardening the security of your Kubernetes cluster by following the CIS Kubernetes Benchmark. You need to implement a solution for securing the etcd cluster using a strong encryption at rest configuration. Explain the steps involved, including the configuration changes required in the etcd cluster and any relevant configuration changes in the Kubernetes control plane.
Answer:
Explanation:
Solution (Step by Step) :
1. Generate Encryption Keys:
- Create a strong encryption key using tools like 'openssr or 'gpg'
- For example, using OpenSSL:
bash
openssl genrsa -out etcd-encryption-key.pem 4096
2. Configure etcd:
- Edit tne etcd server configuration file, typically located at' /etc/etcd/etcd.conf' or a similar path depending on your setup.
- Set the '--data-dirs to the directory where you want to store the encrypted etcd data.
- Add the following lines to enable encryption at rest and specify the encryption key:
- Make sure to replace 'path/to:etcd-enctyption-key.pem' with the actual path to the encryption key file. 3. Configure Kubernetes Control Plane: - If using kubeadm, modify the 'kubeadm init or 'kubeadm joins commands to include the path to the encryption key file in tne =etcd.encryption-key' option. For example: bash kubeadm init -etcd.encryption-key=path/to/etcd-encryption-key.pem 4. Restart etcd and Control Plane Components: - Restart the etcd server and the Kubernetes control plane components like 'kube-apiserver and 'kube-controller-manager' to ensure the new configuration is loaded. 5. Verify Encryption: - After restarting the components, verify that the etcd data is encrypted by checking the directory configured as the '-data-dir' in your etcd configuration. You should see encrypted files. 6. Rotate Encryption Keys (Recommended): - For enhanced security, periodically rotate the encryption key. This involves generating a new key, updating the etcd configuration with the new key, and restarting the etcd and control plane components.
NEW QUESTION # 20
Secrets stored in the etcd is not secure at rest, you can use the etcdctl command utility to find the secret value for e.g:- ETCDCTL_API=3 etcdctl get /registry/secrets/default/cks-secret --cacert="ca.crt" --cert="server.crt" --key="server.key" Output
Using the Encryption Configuration, Create the manifest, which secures the resource secrets using the provider AES-CBC and identity, to encrypt the secret-data at rest and ensure all secrets are encrypted with the new configuration.
Answer:
Explanation:
ETCD secret encryption can be verified with the help of etcdctl command line utility.
ETCD secrets are stored at the path /registry/secrets/$namespace/$secret on the master node.
The below command can be used to verify if the particular ETCD secret is encrypted or not.
# ETCDCTL_API=3 etcdctl get /registry/secrets/default/secret1 [...] | hexdump -C
NEW QUESTION # 21
You are responsible for securing the Kubernetes clusters supply chain. You want to ensure that only images from trusted registries are allowed to be deployed to the cluster. How would you configure Kubernetes to restrict deployments to only images from specific registries?
Answer:
Explanation:
Solution (Step by Step) :
1. Create a Pod Security Policy (PSP):
- A PSP is a policy that enforces security restrictions on pods. You can define the allowed registries for image pulls within the PSP
- create a PSP YAML file:
2. Define Allowed Registries: - Within the 'spec' of your PSP, create a field 'seLinux' and then define the allowed registries within the 'seLinux' field. - Example:
3. Apply the PSP: - Apply the PSP to your cluster using 'kubectl apply -f restricted-registry-psp.yaml' 4. Create a Service Account: - Create a service account that will be allowed to run pods with this PSP:
5. Bind the PSP to the Service Account: - Add the 'securityContext' field to your deployment and specify the PSP you just created:
- Apply the deployment: bash kubectl apply -f deploymentyaml - Now, the deployment will only be able to pull images from the specified registry.
NEW QUESTION # 22
......
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