ReplicaSet

As explained in Platform Engineering on Kubernetes

A ReplicaSet is a Kubernetes resource controller that maintains a specified number of matching pod instances.

How Platform Engineering on Kubernetes covers it

How deep it goes

Explains desired replica counts, automatic replacement, scaling commands, and single-replica downtime, but defers direct ReplicaSet management.

Examples

Demonstrates Frontend scaling, Pod deletion, automatic replacement, replica inspection, and HTTP 503 downtime.

What it assumes

Assumes familiarity with Kubernetes Deployments, Pods, services, and kubectl while illustrating replica behavior through the Frontend application.

What you can do after

Operate ReplicaSet behavior through kubectl by inspecting, scaling, and testing Pod recovery under failure.

How it connects

Connects ReplicaSets to Kubernetes Deployments, Pods, rolling updates, scaling, and Ingress controllers.

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Also explained in

• 

  liveBookmanning.com
  Kubernetes in Action, Second EditionA ReplicaSet is a Kubernetes resource that maintains a specified number of identical pod replicas.
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  liveBookmanning.com
  Acing the Certified Kubernetes Administrator Exam, Second EditionA ReplicaSet is a Kubernetes object that maintains a specified number of equivalent pod replicas through a control loop.
• 

  liveBookmanning.com
  Machine Learning Platform EngineeringA Kubernetes ReplicaSet is a controller that maintains a specified number of identical pod replicas.
• 

  liveBookmanning.com
  Kubernetes for DevelopersA ReplicaSet is a Kubernetes workload resource that maintains a set of Pods matching a specified Pod template and replica count.

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Related concepts

• podproduces · A Kubernetes Pod is the smallest deployable unit in Kubernetes, grouping one or more co-located containers that share networking and other resources.
• Kubernetes Deploymentproduced by · A Kubernetes Deployment is a declarative API resource that manages the desired state, scaling, and updates of a replicated application workload.
• Kubernetes resourcekind of · A Kubernetes resource is a persistent API-managed object representing the desired or observed state of a workload, configuration, or other cluster entity.
• deployment revisionused by · A Deployment revision is a versioned record of a Kubernetes Deployment’s pod template and rollout state, associated with a ReplicaSet.
• pod templateuses · A pod template is a declarative specification embedded in a Kubernetes workload that defines the metadata, containers, and configuration of pods it creates.
• label selectoruses · A label selector is a Kubernetes expression that identifies or filters resources whose labels match specified keys, values, or conditions.

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