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ReplicationController

ReplicationController represents the configuration of a replication controller.
Concept documentation for ReplicationController
  • ReplicationController

    Legacy API for managing workloads that can scale horizontally. Superseded by the Deployment and ReplicaSet APIs.

    1. How a ReplicationController works
    2. Running an example ReplicationController
    3. Writing a ReplicationController Manifest
    4. Working with ReplicationControllers
    5. Common usage patterns
    6. Writing programs for Replication
    7. Responsibilities of the ReplicationController
    8. API Object
    9. Alternatives to ReplicationController
    10. What's next

apiVersion: v1

import "k8s.io/api/core/v1"

ReplicationController

ReplicationController represents the configuration of a replication controller.

Field Description
apiVersion
string
APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
kind
string
Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
metadata
ObjectMeta
If the Labels of a ReplicationController are empty, they are defaulted to be the same as the Pod(s) that the replication controller manages. Standard object's metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
spec
ReplicationControllerSpec
Spec defines the specification of the desired behavior of the replication controller. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
status
ReplicationControllerStatus
Status is the most recently observed status of the replication controller. This data may be out of date by some window of time. Populated by the system. Read-only. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status

ReplicationControllerSpec

ReplicationControllerSpec is the specification of a replication controller.

Field Description
minReadySeconds
integer
Minimum number of seconds for which a newly created pod should be ready without any of its container crashing, for it to be considered available. Defaults to 0 (pod will be considered available as soon as it is ready)
replicas
integer
Replicas is the number of desired replicas. This is a pointer to distinguish between explicit zero and unspecified. Defaults to 1. More info: https://kubernetes.io/docs/concepts/workloads/controllers/replicationcontroller#what-is-a-replicationcontroller
selector
object
Selector is a label query over pods that should match the Replicas count. If Selector is empty, it is defaulted to the labels present on the Pod template. Label keys and values that must match in order to be controlled by this replication controller, if empty defaulted to labels on Pod template. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#label-selectors
template
PodTemplateSpec
Template is the object that describes the pod that will be created if insufficient replicas are detected. This takes precedence over a TemplateRef. The only allowed template.spec.restartPolicy value is "Always". More info: https://kubernetes.io/docs/concepts/workloads/controllers/replicationcontroller#pod-template

ReplicationControllerStatus

ReplicationControllerStatus represents the current status of a replication controller.

Field Description
availableReplicas
integer
The number of available replicas (ready for at least minReadySeconds) for this replication controller.
conditions
ReplicationControllerCondition array
patch strategy: merge on key type
Represents the latest available observations of a replication controller's current state.
fullyLabeledReplicas
integer
The number of pods that have labels matching the labels of the pod template of the replication controller.
observedGeneration
integer
ObservedGeneration reflects the generation of the most recently observed replication controller.
readyReplicas
integer
The number of ready replicas for this replication controller.
replicas *
integer
Replicas is the most recently observed number of replicas. More info: https://kubernetes.io/docs/concepts/workloads/controllers/replicationcontroller#what-is-a-replicationcontroller

ReplicationControllerList

ReplicationControllerList is a collection of replication controllers.

Field Description
apiVersion
string
APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
items *
ReplicationController array
List of replication controllers. More info: https://kubernetes.io/docs/concepts/workloads/controllers/replicationcontroller
kind
string
Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
metadata
ListMeta
Standard list metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds

ReplicationControllerCondition

ReplicationControllerCondition describes the state of a replication controller at a certain point.

Field Description
lastTransitionTime
Time
The last time the condition transitioned from one status to another.
message
string
A human readable message indicating details about the transition.
reason
string
The reason for the condition's last transition.
status *
string
Status of the condition, one of True, False, Unknown.
type *
string
Type of replication controller condition.

© 2026 The Kubernetes Authors | Documentation Distributed under CC BY 4.0
Copyright © 2026 The Linux Foundation ®. All rights reserved.
https://kubernetes.io/docs/reference/kubernetes-api/core/replication-controller-v1/

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