I was playing with Kubernetes in Minikube. I could able to deploy spring boot sample application into Kubernetes.

I am exploring Kubernetes configMap. I could successfully run a spring boot application with a spring cloud starter and picking the property keys from config map. Till here I am successful.

The issue I am facing currently is configmap reload.

Here is my config map :

ConfigMap.yaml

 apiVersion: v1
kind: ConfigMap
metadata:
  name: minikube-sample
  namespace: default
data:
  app.data.name: name
  application.yml: |-
    app:
      data:
        test: test

bootstrap.yaml

management:
    endpoint:
        health:
            enabled: true
        info:
            enabled: true
        restart:
            enabled: true
spring:
    application:
        name: minikube-sample
    cloud:
        kubernetes:
            config:
                enabled: true
                name: ${spring.application.name}
                namespace: default
            reload:
                enabled: true

HomeController:

package com.minikube.sample.rest.controller;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.minikube.sample.properties.PropertiesConfig;
import lombok.Getter;
import lombok.Setter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Lookup;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author Gorantla, Eresh
 * @created 06-12-2018
 */
@RestController
@RequestMapping("/home")
public class HomeResource {

    @Autowired
    PropertiesConfig config;

    @GetMapping("/data")
    public ResponseEntity<ResponseData> getData() {
        ResponseData responseData = new ResponseData();
        responseData.setId(1);
        responseData.setName(config.getName());
        responseData.setPlace("Hyderabad");
        responseData.setValue(config.getTest());
        return new ResponseEntity<>(responseData, HttpStatus.OK);
    }

    @Getter
    @Setter
    public class ResponseData {
        private String name;
        private Integer id;
        private String place;
        private String value;
    }
}

deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: minikube-sample
  namespace: default
spec:
  selector:
      matchLabels:
        app: minikube-sample

  replicas: 1
  template:
    metadata:
      labels:
        app: minikube-sample
    spec:
      containers:
        - name: minikube-sample
          image: minikube-sample:latest
          imagePullPolicy: Never
          ports:
            - containerPort: 8080
          env:
            - name: env.namespace
              value: default
          volumeMounts:
            - name: config
              mountPath: /config
      volumes:
        - name: config
          configMap:
            name: minikube-sample

I used @ConfigurationProperties to reload properties.

Dependencies

 <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-kubernetes</artifactId>
            <version>1.1.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-kubernetes-config</artifactId>
            <version>1.1.0.RELEASE</version>
        </dependency>

What I did ? I have gone through spring cloud documentation. "The view role on the service account is required in order to listen for config map changes." Then I created cluster view role through below command

C:\Users\eresh.gorantla\apps\minikube-sample\src\main\fabric8 (master -> origin)
λ kubectl create clusterrolebinding minikube-sample --clusterrole=view --serviceaccount=default:minikube --namespace=default
clusterrolebinding.rbac.authorization.k8s.io/minikube-sample created

But when I update the configmap in kubernetes, the properties are not reloaded on the fly. I suspect something wrong in clusterrolebinding. Please provide your thoughts. Any help is appreciated.