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What You Will Learn
Beginner
- All key Kubernetes terms explained simply
- How pods, nodes, and clusters relate
- The K8s object hierarchy
Essential Terms
| Term | What it is | Analogy |
|---|---|---|
| Cluster | A set of machines running K8s | A factory |
| Node | A single machine in the cluster | A worker in the factory |
| Pod | Smallest deployable unit (1+ containers) | A task assignment |
| Deployment | Manages a set of Pods (scaling, updates) | A team of workers |
| Service | Stable network endpoint for Pods | A phone number for the team |
| Namespace | Logical partition of the cluster | A department |
| ConfigMap | Configuration data for Pods | A settings file |
| Secret | Sensitive data (passwords, tokens) | A locked safe |
| Ingress | HTTP routing to services | A receptionist directing visitors |
| Volume | Persistent storage for Pods | A filing cabinet |
The Object Hierarchy
Cluster contains Nodes
Nodes run Pods
Pods contain Containers
Deployments manage Pods
Services provide access to Pods
Ingress routes traffic to Services
Pod = not a container
A Pod can contain 1 or more containers. Usually 1 container per Pod. The Pod is the smallest unit K8s manages - not the container.Practical Exercise
Read through the terms table
Draw the object hierarchy on paper
Try to explain each term in your own words
Search for each term in the K8s docs
Key Takeaways
- Cluster > Nodes > Pods > Containers.
- Pod = smallest K8s unit (not container).
- Deployment manages Pods (scaling, updates).
- Service = stable network identity for Pods.
- ConfigMap = config. Secret = sensitive data. Volume = storage.
- Namespace = logical partition for organizing resources.
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