Let’s break down components and understand their correlation with vSphere terms:
Pod:
In Kubernetes, a Pod is the smallest deployable unit that can be created and managed. It represents one or more containers that share the same network IP, port space, and storage.
vSphere Relation: Think of a Pod as a VM. While they’re not the same, both are units that encapsulate an application environment. However, Pods are more lightweight and ephemeral than VMs.
Tanzu Kubernetes Cluster (TKC):
This is a fully conformant Kubernetes cluster provided by Tanzu Kubernetes Grid Service. It’s managed by the Supervisor Cluster in vSphere with Tanzu.
vSphere Relation: Think of a TKC as a cluster of VMs. Each node in the TKC is a VM in vSphere. The Supervisor Cluster manages the lifecycle of these VMs.
Namespace:
In Kubernetes, a Namespace is a way to divide cluster resources between multiple users or teams. It’s like a virtual cluster within the same physical cluster.
vSphere Relation: Think of Namespaces as Resource Pools in vSphere. They both allow for isolation and management of resources.
TKG Worker Node:
In Tanzu Kubernetes Grid, a worker node is a VM that runs your application containers. It’s managed by the control plane nodes.
vSphere Relation: Think of a TKG Worker Node as a VM in vSphere. The VM is specially configured to be part of a Kubernetes cluster.
Correlation with vSphere Components:
vSphere VMs and Tanzu: In vSphere with Tanzu, every node (whether it’s a control plane node or a worker node) in a Tanzu Kubernetes Cluster is a VM in vSphere.
vSphere Networking and Tanzu: Tanzu leverages NSX-T for networking. Each Pod gets its own IP, and services are also assigned IPs, all managed by NSX-T.
vSphere Storage and Tanzu: Persistent storage for Pods is provided using the CNS (Cloud Native Storage) feature of vSphere. This allows Pods to leverage vSphere storage capabilities like vSAN, NFS, etc.
vCenter Server: It’s the central place for managing both your traditional VM infrastructure and your new Kubernetes infrastructure with Tanzu.
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