Kubernetes Security Basics
Secure clusters.
Kubernetes Security Basics is a free Cyber Security Academy lesson on CoddyKit — lesson 4 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Cyber Security Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
What Is Kubernetes
Kubernetes is a system that runs and manages many containers across many machines.
It groups containers into pods and schedules them onto nodes automatically.
Why Clusters Are Targets
A Kubernetes cluster often runs an organization's most important apps.
Its many moving parts, the control plane, nodes, and network, give attackers a large surface to probe.
Protect the API Server
The API server is the brain of the cluster. Every action goes through it.
It must never be exposed to the public internet without strong authentication, or attackers can control everything.
RBAC Basics
RBAC means Role-Based Access Control. It decides who can do what in the cluster.
Give each user and service only the permissions they need, following the principle of least privilege.
Service Accounts
Pods talk to the API using a service account.
By default this can be overly permissive. Disable the token when a pod does not need it:
automountServiceAccountToken: falseNamespaces for Isolation
Namespaces split a cluster into separate areas.
Putting teams or environments in different namespaces limits blast radius and makes access rules easier to manage.
Network Policies
By default, all pods can talk to each other freely.
A network policy restricts that traffic, so a compromised pod cannot reach everything. Allow only the connections you truly need.
Managing Secrets
Kubernetes Secrets hold sensitive data like passwords and tokens.
Enable encryption at rest and never hardcode secrets into pod definitions or images.
Pod Security
Pods should follow the same hardening as any container:
- Run as non-root
- Drop unneeded capabilities
- Avoid privileged mode
Pod Security standards help enforce these rules cluster-wide.
Audit Logging
The API server can record every request as an audit log.
These logs reveal who did what and when, which is essential for spotting and investigating suspicious activity.
Keep It Updated
Kubernetes and its components release security fixes regularly.
Running an old version leaves known holes open. Patch the control plane, nodes, and add-ons on a schedule.
Quick Check
What does RBAC control in a Kubernetes cluster?
Recap
Securing Kubernetes means protecting the API server, applying RBAC and least privilege, isolating with namespaces and network policies, managing secrets safely, hardening pods, enabling audit logs, and patching often.
Frequently asked questions
Is the “Kubernetes Security Basics” lesson free?
Yes — the full text of “Kubernetes Security Basics” is free to read here on the web, and the Cyber Security Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Cyber Security Academy course, upgrade to CoddyKit PRO.
What will I learn in “Kubernetes Security Basics”?
Secure clusters. You practise Cyber Security Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Cyber Security Academy?
No prior experience is required. Cyber Security Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 4 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Kubernetes Security Basics” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Cyber Security Academy lesson?
Yes. Every Cyber Security Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- Container Threats
- Image Scanning
- Runtime Security
- Kubernetes Security Basics