spring boot cloud kubernetes config not working for multiple pods - spring

Question

I am using spring-cloud-starter-kubernetes-all dependency for reading config map from my spring boot microservices and its working fine.
After modifying the config map i am using refresh endpoint
minikube servie list # to get the servive url
curl http://192.168.99.100:30824/actuator/refresh -d {} -H "Content-Type: application/json"
it working as expected and application loads configmap changes.
Issue
The above working fine if i have only 1 pod of my application but when i do use more that 1 pods only 1 pods picks the changes not all.
In below example only i pod picks the changes
[message-producer-5dc4b8b456-tbbjn message-producer] Say Hello to the World12431
[message-producer-5dc4b8b456-qzmgb message-producer] Say Hello to the World
minkube deployment
apiVersion: apps/v1
kind: Deployment
metadata:
name: message-producer
labels:
app: message-producer
spec:
replicas: 2
selector:
matchLabels:
app: message-producer
template:
metadata:
labels:
app: message-producer
spec:
containers:
- name: message-producer
image: sandeepbhardwaj/message-producer
ports:
- containerPort: 8080
---
apiVersion: v1
kind: Service
metadata:
name: message-producer
spec:
selector:
app: message-producer
ports:
- protocol: TCP
port: 80
targetPort: 8080
type: LoadBalancer
configmap.yml
kind: ConfigMap
apiVersion: v1
metadata:
name: message-producer
data:
application.yml: |-
message: Say Hello to the World
bootstrap.yml
spring:
cloud:
kubernetes:
config:
enabled: true
name: message-producer
namespace: default
reload:
enabled: true
mode: EVENT
strategy: REFRESH
period: 3000
configuration
#ConfigurationProperties(prefix = "")
#Configuration
#Getter
#Setter
public class MessageConfiguration {
private String message = "Default message";
}
rbac
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
namespace: default # "namespace" can be omitted since ClusterRoles are not namespaced
name: service-reader
rules:
- apiGroups: [""] # "" indicates the core API group
resources: ["services"]
verbs: ["get", "watch", "list"]
---
apiVersion: rbac.authorization.k8s.io/v1
# This cluster role binding allows anyone in the "manager" group to read secrets in any namespace.
kind: ClusterRoleBinding
metadata:
name: service-reader
subjects:
- kind: User
name: default # Name is case sensitive
apiGroup: rbac.authorization.k8s.io
roleRef:
kind: ClusterRole
name: service-reader
apiGroup: rbac.authorization.k8s.io

Answer 1

This is happening because when you hit curl http://192.168.99.100:30824/actuator/refresh -d {} -H "Content-Type: application/json" kubernetes will send that request to one of the pods behind the service via round robin load balancing.
You should use the property source reload feature by setting spring.cloud.kubernetes.reload.enabled=true. This will reload the property whenever there is a change in the config map hence you don't need to use the refresh endpoint.