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10-Nodes.md

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Node

Kubernetes runs your workload by placing containers into Pods to run on Nodes. A node may be a virtual or physical machine, depending on the cluster. Each node is managed by the control plane and contains the services necessary to run Pods.

Node Management

There are two main way to have Node add to the K8s API server

  1. The kubelet on a node self-registers to the control plane
  2. Manually add a Node object for the Controller to check.

An example of json manifest of the Node object

{
  "kind": "Node",
  "apiVersion": "v1",
  "metadata": {
    "name": "10.240.79.157",
    "labels": {
      "name": "my-first-k8s-node"
    }
  }
}

Note

Kubernetes keeps the object for the invalid Node and continues checking to see whether it becomes healthy. The Node object name (metadata) must be a valid DNS subdomain name.