Controllers

• Controllers are part of Workload APIs
• Controllers can maintain desired state

Replication Controller.

• Replication controller can replicate pods.
• Desired State would be number of pods
• Gives Self-Healing Capability to K8S cluster

Writing Replication Controller Manifest YAML

• In Replication Controller’s spec we would have information of POD.
• Refer API Reference from here

---
apiVersion: v1
kind: ReplicationController
metadata:
  name: tomcat-rc
spec:
  replicas: 2
  template:
    metadata:
      labels:
        app: tomcat
    spec:
      containers:
        - image: tomcat:8
          name: tomcat
          ports:
            - containerPort: 8080
              protocol: TCP