Kubernetes worker node

As explained in Road to Kubernetes

A node is a machine in a Kubernetes cluster that runs container workloads.

A Kubernetes worker node is a virtual machine that belongs to a cluster and runs container workloads. Kubernetes places containers on nodes, while containerd provides the lightweight container runtime used by Kubernetes. section 8.1.3 section 1.6

Understand a node through the surrounding Kubernetes structure:

• A cluster groups the virtual machines that run Kubernetes and containers. section 8.1.3
• Kubernetes chooses which node runs a container by default. section 1.6
• Pods provide the smallest running unit for containers, and Deployments commonly create those Pods. section 8.1.3

Running a web application

When a container-based web application runs in Kubernetes, the cluster distributes its containers across virtual machines. Kubernetes selects the node for each workload, while a Deployment defines the desired Pods and a Service exposes them. section 8.1.3 section 1.6

Figure 8.3 Kubernetes concepts

Use the Kubernetes concepts diagram to see how nodes fit within clusters alongside containers, Pods, Deployments, and Services. section 8.1.3

How Road to Kubernetes covers it

How deep it goes

Defines nodes and workload placement, but stops short of node administration, capacity, and scheduling internals.

Examples

Uses virtual machines running containers for a container-based web application.

What it assumes

Assumes basic containers and introduces clusters, nodes, Pods, Deployments, and Services at a high level.

What you can do after

Evaluate how Kubernetes places container workloads across virtual machines in a cluster.

How it connects

Connects nodes with Kubernetes clusters, containers, containerd, Pods, Deployments, and Services.

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Also explained in

• 

  liveBookmanning.com
  Kubernetes in Action, Second EditionA Kubernetes node is a machine that runs kubelet, containers, and pods belonging to a cluster.
• 

  liveBookmanning.com
  Acing the Certified Kubernetes Administrator Exam, Second EditionA worker node is a machine in a Kubernetes cluster that runs application workloads and node-level Kubernetes components.
• 

  liveBookmanning.com
  Kubernetes for DevelopersA node is an individual machine that provides computing resources within a cluster.
• 

  liveBookmanning.com
  Google Anthos in ActionA worker node is a Kubernetes cluster node that reports available resources, runs container workloads, and maintains node network rules.
• 

  liveBookmanning.com
  Azure SecurityA Kubernetes worker node is a machine that runs containerized workloads scheduled by the cluster control plane.

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Related concepts

• Kubernetespart of · Kubernetes is an open-source platform for orchestrating and automating the deployment, scaling, and management of containerized workloads across computing clusters.
• computer clusterpart of · A computer cluster is a group of interconnected computing nodes coordinated to provide shared computing resources, execute workloads, or deliver services.
• podused by · A Kubernetes Pod is the smallest deployable unit in Kubernetes, grouping one or more co-located containers that share networking and other resources.
• virtual machinekind of · A virtual machine is a software-based environment that emulates or implements an abstract computer system, providing an interface on which an operating system or programs can execute.
• Kubernetes clusterpart of · A Kubernetes cluster is a set of control-plane and worker machines managed by Kubernetes to run and coordinate workloads and services.
• metadata sectionhas part · A metadata section is the part of a Kubernetes object definition containing identity and management metadata for an object instance.

This explainer was generated by Manning's knowledge graph from the text of Road to Kubernetes. The section links point to the parts of the book it draws on.