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ReplicaSets

ReplicaSet : A process that monitors the pods and redeploys if it fails

The labels in the RS spec section search for pods with those labels, so it matches the template/labels section and not the metadata/labels section!

tip

ReplicaSets can also manage pods that were not created under the replicaset itself.

Template​

# tip! Are you sure you don't want a deployment ?

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: ${RESOURCE_NAME}
  namespace: default
  labels: &app_labels
    name: ${RESOURCE_NAME}
spec:
  selector:
    matchLabels:
      <<: *app_labels
  replicas: 1
  template:
    metadata:
      name: ${RESOURCE_NAME}
      labels:
        <<: *app_labels
    spec:
      containers:
        - name: ${RESOURCE_NAME}
          image: localhost:30000/${RESOURCE_NAME}:latest

Replication Controller​

Replication Controller is older technology, ReplicaSet is newer standard. Both do similar tasks.