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Kubernetes CKS Study Guide

Preview the Kubernetes CKS flashcard-note study format, then unlock Pro for the complete section-by-section guide.

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Section 1 Use Network security policies to restrict cluster level access Preview

Preview: Cluster Setup (15%)

Preview includes
  • 4 of 6 lesson topics
  • 1 overview segment
  • 3 core concepts
  • 2 exam tips

Lesson Topics

  • Isolation model
  • Pod and namespace selectors
  • Ingress and egress
  • ipBlock and except

Overview

NetworkPolicy is a Kubernetes API policy object that describes allowed Layer 3/4 traffic for selected Pods; actual enforcement depends on a compatible network plugin.

Core Concepts

  • Ingress isolation and egress isolation are independent. A Pod can be isolated for one direction but not the other.
  • Multiple NetworkPolicies are additive. Policy order and resource names do not create priority; allowed traffic is the union of matching allow rules.
  • For Pod-to-Pod traffic, the source Pod egress rules and destination Pod ingress rules must both allow the connection when both sides are isolated.

Exam Tips

  • Start by asking: which Pods are selected, for which direction, and is the peer expressed correctly?
  • When traffic fails after default deny, verify DNS first, then peer selectors, ports, and both ends of Pod-to-Pod traffic.
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Section 2 Use CIS benchmark to review security configuration of Kubernetes components Pro
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Section 3 Properly set up Ingress with TLS Pro
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Section 4 Protect node metadata and endpoints Pro
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Section 5 Verify platform binaries before deploying Pro
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Section 6 Use Role Based Access Controls to minimize exposure Pro
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Section 7 Exercise caution in using service accounts Pro
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Section 8 Restrict access to Kubernetes API Pro
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Section 9 Upgrade Kubernetes to avoid vulnerabilities Pro
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Section 10 Minimize host OS footprint Pro
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Section 11 Using least-privilege identity and access management Pro
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Section 12 Minimize external access to the network Pro
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Section 13 Appropriately use kernel hardening tools such as AppArmor, seccomp Pro
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Section 14 Use appropriate pod security standards Pro
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Section 15 Manage Kubernetes secrets Pro
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Section 16 Understand and implement isolation techniques Pro
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Section 17 Implement Pod-to-Pod encryption Pro
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Section 18 Minimize base image footprint Pro
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Section 19 Understand your supply chain Pro
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Section 20 Secure your supply chain Pro
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Section 21 Perform static analysis of user workloads and container images Pro
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Section 22 Perform behavioral analytics to detect malicious activities Pro
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Section 23 Detect threats within physical infrastructure, apps, networks, data, users and workloads Pro
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Section 24 Investigate and identify phases of attack and bad actors within the environment Pro
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Section 25 Ensure immutability of containers at runtime Pro
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Section 26 Use Kubernetes audit logs to monitor access Pro
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