Using Infinispan remote cache - PART 2: Kubernetes
In this guide, you will learn HOW-TO run the Docker Image we built in Using Infinispan remote cache - PART 1: Docker Image on Kubernetes.
Prerequisites
To complete this guide, you need:
Infinispan
We basically will repeat everything we did in WildFly Java Microservice - PART 2: Kubernetes but, before, we will deploy Infinispan on Kubernetes.
Infinispan configmap
Create a file named infinispan-configmap.yaml with the following content:
apiVersion: v1
kind: ConfigMap
metadata:
name: infinispan-secret
labels:
app: infinispan
data:
USER: admin
PASS: 123pippobaudoapply the ConfigMap configuration to Kubernetes:
kubectl apply -f infinispan-configmap.yamlInfinispan deployment
Create a file named infinispan-deployment.yaml with the following content:
apiVersion: apps/v1
kind: Deployment
metadata:
name: infinispan
spec:
replicas: 1
selector:
matchLabels:
app: infinispan
template:
metadata:
labels:
app: infinispan
spec:
containers:
- name: infinispan
image: 'quay.io/infinispan/server:latest'
imagePullPolicy: IfNotPresent
ports:
- containerPort: 5432
env:
- name: USER
valueFrom:
configMapKeyRef:
name: infinispan-secret
key: USER
- name: PASS
valueFrom:
configMapKeyRef:
name: infinispan-secret
key: PASS
- name: JAVA_OPTIONS
value: '-Dinfinispan.cluster.stack=kubernetes -Djgroups.dns.query="infinispan-dns-ping.myproject.svc.cluster.local"'apply the Deployment configuration to Kubernetes:
kubectl apply -f infinispan-deployment.yamlInfinispan service
Create a file named infinispan-service.yaml with the following content:
apiVersion: v1
kind: Service
metadata:
name: infinispan-service
labels:
app: infinispan
spec:
ports:
- protocol: TCP
port: 11222
targetPort: 11222
selector:
app: infinispanapply the Service configuration to Kubernetes:
kubectl apply -f infinispan-service.yaml|
Note
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if you are using minikube, and you want to test if Infinispan Server on Kubernetes is working, run kubectl port-forward svc/infinispan-service 11222:11222, then open http://0.0.0.0:11222/console/ in your browser and log in as admin / 123pippobaudo
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Image Registry
To make the my-jaxrs-app-infinispan:latest Docker Image available to Kubernetes, you need to push it to some Image Registry that is accessible by the Kubernetes cluster you want to use.
Quay.io
There are many options to achieve this; in this guide, we will push the my-jaxrs-app-infinispan:latest Docker Image, to the quay.io Image Registry.
Create a public repository named my-jaxrs-app-infinispan on quay.io (e.g. https://quay.io/repository/tborgato/my-jaxrs-app-infinispan).
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Note
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replace tborgato with the name of your account in all the commands that will follow
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Tag the Docker image:
podman tag my-jaxrs-app-infinispan quay.io/tborgato/my-jaxrs-app-infinispanPush the my-jaxrs-app-infinispan Docker Image to it:
podman push quay.io/tborgato/my-jaxrs-app-infinispanAt this point, the my-jaxrs-app-infinispan:latest Docker Image should be publicly available and free to be consumed by any Kubernetes Cluster; you can verify this by running:
podman pull quay.io/tborgato/my-jaxrs-app-infinispanDeploy to Kubernetes
To deploy our my-jaxrs-app-infinispan Docker Image on minikube, create a file named deployment-my-jaxrs-app-infinispan.yaml (see kubernetes deployment) in the same directory as the Dockerfile and the pom.xml file, with the following content:
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-jaxrs-app-infinispan-deployment
labels:
app: my-jaxrs-app-infinispan
spec:
replicas: 1
selector:
matchLabels:
app: my-jaxrs-app-infinispan
template:
metadata:
labels:
app: my-jaxrs-app-infinispan
spec:
containers:
- name: my-jaxrs-app-infinispan
image: quay.io/tborgato/my-jaxrs-app-infinispan
ports:
- containerPort: 8080
- containerPort: 9990
livenessProbe:
httpGet:
path: /health/live
port: 9990
readinessProbe:
httpGet:
path: /health/ready
port: 9990
startupProbe:
httpGet:
path: /health/started
port: 9990
env:
- name: INFINISPAN_SERVER_HOST
value: infinispan-service
- name: INFINISPAN_SERVER_PORT
value: '11222'
- name: INFINISPAN_SERVER_USER
valueFrom:
configMapKeyRef:
name: infinispan-secret
key: USER
- name: INFINISPAN_SERVER_PASSWORD
valueFrom:
configMapKeyRef:
name: infinispan-secret
key: PASSapply the Deployment configuration to Kubernetes:
kubectl apply -f deployment-my-jaxrs-app-infinispan.yamlWe used minikube as Kubernetes Cluster, hence we expose the deployment as NodePort:
kubectl expose deployment.apps/my-jaxrs-app-infinispan-deployment --type=NodePort --port=8080Check the application
Find out on what IP address/port, minikube is exposing your service:
$ minikube service my-jaxrs-app-infinispan-deployment --url
http://192.168.39.143:31076Open http://192.168.39.143:31076/ in your Browser, enter some name in the Name field (e.g. "pippo") and press `Say Hello`".
Stop the application:
kubectl scale deploy my-jaxrs-app-infinispan-deployment --replicas=0Start the application once again:
kubectl scale deploy my-jaxrs-app-infinispan-deployment --replicas=1Type a different name in the Name field and press Say Hello again: the page should display something like "last time you were pippo" and that means that the previous name was stored in the Infinispan Server.
