App Java web (javaee8) with Wildfly, PostgreSQL and Docker.

Running on Kubernetes and replicating the session between instances using Kube Ping.

Settings

Clone the project repository:

git clone https://github.com/evandromoura/jkubecluster.git

Settings: kubernetes/standalone-full-ha.xml

Datasource:

Configure according to your PostgreSQL connection data

HOST:

<host name="jkubecluster" alias="jkubecluster.evandromoura.com" default-web-module="jkubecluster.war"></host>
Configure the Host correctly

If you need to register the host on your machine:

echo "192.168.xx.xx jkubecluster.evandromoura.com" >> /etc/hosts

Enter the IP of Kubernetes – NGINX – IngressController

Understanding the Dockerfile file

FROM jboss/wildfly LABEL MAINTAINER Evandro Moura USER root COPY kubernetes/docker-entrypoint.sh $JBOSS_HOME/docker-entrypoint.sh RUN chown jboss $JBOSS_HOME/docker-entrypoint.sh && \ chmod a+x $JBOSS_HOME/docker-entrypoint.sh #KUBE_PING COPY kubernetes/kubeping-module $JBOSS_HOME/modules/system/layers/base/org/jgroups/kubernetes #CONEXAO COPY kubernetes/standalone-full-ha.xml $JBOSS_HOME/standalone/configuration/standalone-full-ha.xml COPY kubernetes/postgresql-8.4-701.jdbc3.jar $JBOSS_HOME/standalone/deployments/ #BUILD COPY /target/jkubecluster.war $JBOSS_HOME/standalone/deployments/ #PORTAS EXPOSE 8080 8009 9990 7600 8888 ENTRYPOINT $JBOSS_HOME/docker-entrypoint.sh

When generating the Docker build, it will copy the KUBE PING module files, the standalone-full-ha.xml file (with the datasource and host information) and the build to the corresponding wildfly directories.

Also, it will set the docker ENTRYPOINT to docker-entrypoint.sh

Docker build creation and upload to Docker Hub

File buildAndRun.sh

mvn clean package && sudo docker build -t evandromoura/jkubecluster . && sudo docker push evandromoura/jkubecluster

Change the command above informing your repository on the docker hub

Configuration of Kubernetes components

Prerequisites: Have Kubernetes and NGINX Ingress Controller installed:

• Installation of Kubernetes
• Installing NGINX Controller

Namespace

kind: Namespace apiVersion: v1 metadata: name: jkubecluster

Jgroups / Cluster Role

kind: ServiceAccount apiVersion: v1 metadata: name: jgroups-kubeping-service-account namespace: jkubecluster --- kind: ClusterRole apiVersion: rbac.authorization.k8s.io/v1 metadata: name: jgroups-kubeping-pod-reader namespace: jkubecluster rules: - apiGroups: [""] resources: ["pods"] verbs: ["get", "list"] --- kind: ClusterRoleBinding apiVersion: rbac.authorization.k8s.io/v1beta1 metadata: name: jgroups-kubeping-api-access roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: jgroups-kubeping-pod-reader subjects: - kind: ServiceAccount name: jgroups-kubeping-service-account namespace: jkubecluster

Deployment

apiVersion: apps/v1 kind: Deployment metadata: name: jkubecluster-evandromoura namespace: jkubecluster spec: selector: matchLabels: app: jkubecluster-evandromoura-server tier: Production replicas: 3 template: metadata: labels: app: jkubecluster-evandromoura-server tier: Production spec: serviceAccountName: jgroups-kubeping-service-account containers: - name: jkubecluster-evandromoura image: evandromoura/jkubecluster command: ["/opt/jboss/wildfly/bin/standalone.sh"] args: ["--server-config", "standalone-full-ha.xml", "-b", $(POD_IP), "-bmanagement", $(POD_IP) ,"-bprivate", $(POD_IP) ] imagePullPolicy: Always ports: - containerPort: 8080 - containerPort: 9990 - containerPort: 7600 - containerPort: 8888 env: - name: POD_IP valueFrom: fieldRef: apiVersion: v1 fieldPath: status.podIP - name: KUBERNETES_NAMESPACE valueFrom: fieldRef: apiVersion: v1 fieldPath: metadata.namespace - name: KUBERNETES_LABELS value: app=jkubecluster-evandromoura

Service

apiVersion: v1 kind: Service metadata: name: jkubecluster-evandromoura-service namespace: jkubecluster spec: type: LoadBalancer selector: app: jkubecluster-evandromoura-server ports: - name: jkubecluster-evandromoura-http protocol: TCP port: 8080 targetPort: 8080 #externalIPs: #- 192.168.12.50

Ingress

apiVersion: networking.k8s.io/v1 kind: Ingress metadata: name: jkubecluster-evandromoura-ingress namespace: jkubecluster annotations: nginx.ingress.kubernetes.io/rewrite-target: / kubernetes.io/ingress.class: nginx nginx.ingress.kubernetes.io/ssl-redirect: "false" nginx.ingress.kubernetes.io/affinity: "cookie" #cert-manager.io/cluster-issuer: "letsencrypt-prod" spec: tls: - hosts: - https-jkubecluster.evandromoura.com secretName: tls-jkubecluster-ingress rules: - host: jkubecluster.evandromoura.com http: paths: - path: / pathType: Prefix backend: service: name: jkubecluster-evandromoura-service port: number: 8080

Applying the jkubecluster-app.yaml file

Run this configuration on the master

kubectl apply -f jkubecluster-app.yaml

Running and testing session replication

3 replicas of our container were created.

Let's stop POD jkubecluster-evandromoura-97d578665-wb5j8

Refreshing the page will redirect it to another POD and keep the session values