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.
