Deploying a Coherence Cluster in Kubernetes


Coherence-Operator is a Kubernetes opeartor for deploying Oracle Coherence in k8s. Let’s see how to do it.

1 Clean previous setup intents:

helm del --purge sample-coherence
helm del --purge sample-coherence-operator
kubectl delete namespace sample-coherence-ns

2 Execute the following:

kubectl config set-context $(kubectl config current-context) --namespace=sample-coherence-ns

helm repo add coherence https://oracle.github.io/coherence-operator/charts

helm repo update

helm --debug install coherence/coherence-operator --name sample-coherence-operator --set "targetNamespaces={}" --set imagePullSecrets=sample-coherence-secret

helm ls

helm status sample-coherence-operator

3 Create a secret with your credentials to Oracle Container Registry:

kubectl create secret docker-registry oracle-container-registry-secret --docker-server=container-registry.oracle.com --docker-username='youruser' --docker-password='yourpasswd' --docker-email='youremail'

4 Install:

helm --debug install coherence/coherence --name sample-coherence --set imagePullSecrets=oracle-container-registry-secret

5 Proxy to a pod:

export POD_NAME=$(kubectl get pods --namespace sample-coherence-ns -l "app=coherence,release=sample-coherence,component=coherencePod" -o jsonpath="{.items[0].metadata.name}")

kubectl --namespace sample-coherence-ns port-forward $POD_NAME 20000:20000

6 Download and install Coherence Stand Alone

7 Download this and this

8 Build the client:

export COHERENCE_HOME=~/Oracle/Middleware/Oracle_Home/coherence
javac -cp .:${COHERENCE_HOME}/lib/coherence.jar HelloCoherence.javaexport COHERENCE_HOME=~/Oracle/Middleware/Oracle_Home/coherence

9 Test it:

java -cp .:${COHERENCE_HOME}/lib/coherence.jar -Dcoherence.cacheconfig=$PWD/example-client-config.xml HelloCoherence

2019-07-11 01:21:33.575/0.538 Oracle Coh...

…

Oracle Coherence Version 12.2.1.3.0 Build 68243

2019-07-11 01:21:34.430/1.392 Oracle 

The value of the key is 7

That’s all, hope it helps 🙂

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