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Oracle WebLogic Operator Tutorial

Deploy WebLogic domain

Preparing the Kubernetes cluster to run WebLogic domains

Create the domain namespace:

kubectl create namespace sample-domain1-ns

Create a Kubernetes secret containing the Administration Server boot credentials:

kubectl -n sample-domain1-ns create secret generic sample-domain1-weblogic-credentials \
  --from-literal=username=weblogic \
  --from-literal=password=welcome1

Update Traefik loadbalancer and WebLogic Operator configuration

Once you have your domain namespace (WebLogic domain not yet deployed) you have to update loadbalancer's and operator's configuration about where the domain will be deployed.

Make sure before execute domain helm install you are in the WebLogic Operator's local Git repository folder.

cd /u01/content/weblogic-kubernetes-operator/

To update operator execute the following helm upgrade command:

helm upgrade \
  --reuse-values \
  --set "domainNamespaces={sample-domain1-ns}" \
  --wait \
  sample-weblogic-operator \
  kubernetes/charts/weblogic-operator

To update Traefik execute the following helm upgrade command:

helm upgrade \
  --reuse-values \
  --set "kubernetes.namespaces={traefik,sample-domain1-ns}" \
  --wait \
  traefik-operator \
  stable/traefik

Please note the only updated parameter in both cases is the domain namespace.

Deploy WebLogic domain on Kubernetes

To deploy WebLogic domain you need to create a domain resource definition which contains the necessary parameters for the operator to start the WebLogic domain properly.

We provided for you domain.yaml file that contains yaml representation of the custom resoirce object. Please copy it locally

curl -LSs https://raw.githubusercontent.com/nagypeter/weblogic-operator-tutorial/master/k8s/domain_short.yaml >/u01/domain.yaml

Please review it with your favorite editor.

Cerate Domain custom resource object by applying the following command:

kubectl apply -f /u01/domain.yaml

Check the introspector job which needs to be run first:

$ kubectl get pod -n sample-domain1-ns
NAME                                         READY     STATUS              RESTARTS   AGE
sample-domain1-introspect-domain-job-kcn4n   0/1       ContainerCreating   0          7s

Check periodically the pods in the domain namespace and soon you will see the servers are starting:

$ kubectl get po -n sample-domain1-ns -o wide
NAME                             READY     STATUS    RESTARTS   AGE       IP            NODE            NOMINATED NODE
sample-domain1-admin-server      1/1       Running   0          2m        10.244.2.10   130.61.84.41    <none>
sample-domain1-managed-server1   1/1       Running   0          1m        10.244.2.11   130.61.84.41    <none>
sample-domain1-managed-server2   0/1       Running   0          1m        10.244.1.4    130.61.52.240   <none>

You have to see three running pods similar to the result above. If you don't see all the running pods please wait and check periodically. The whole domain deployment may take up to 2-3 minutes depending on the compute shapes.

In order to access any application or admin console deployed on WebLogic you have to configure Traefik ingress. OCI Load balancer is already assigned during Traefik install in the previous step.

As a simple solution the best is to configure path routing which will route the external traffic through Traefik to domain cluster address or admin server's console.

Execute the following ingress resource definition:

cat << EOF | kubectl apply -f -
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: traefik-pathrouting-1
  namespace: sample-domain1-ns
  annotations:
    kubernetes.io/ingress.class: traefik
spec:
  rules:
  - host:
    http:
      paths:
      - path: /
        backend:
          serviceName: sample-domain1-cluster-cluster-1
          servicePort: 8001
      - path: /console
        backend:
          serviceName: sample-domain1-admin-server
          servicePort: 7001          
EOF

Please note the two backends and the namespace, serviceName, servicePort definitions. The first backend is the domain cluster service to reach the application at the root context path. The second is for the admin console which is a different service.

Once the Ingress has been created construct the URL of the admin console based on the following pattern:

http://EXTERNAL-IP/console

The EXTERNAL-IP was determined during Traefik install. If you forgot to note the execute the following command to get the public IP address:

$ kubectl describe svc traefik-operator --namespace traefik | grep Ingress | awk '{print $3}'
129.213.172.44

Construct the Administration Console's url and open in a browser:

Enter admin user credentials (weblogic/welcome1) and click Login

!Please note in this use case the use of Administration Console is just for demo/test purposes because domain configuration persisted in pod which means after the restart the original values (baked into the image) will be used again. To override certain configuration parameters - to ensure image portability - follow the override part of this tutorial.

Test the demo Web Application

The URL pattern of the sample application is the following:

http://EXTERNAL-IP/opdemo/?dsname=testDatasource

Refresh the page and notice the hostname changes. It reflects the managed server's name which responds to the request. You should see the load balancing between the two managed servers.

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