To load balance Oracle WebCenter Portal domain clusters, you can install the ingress-based Traefik load balancer (version 2.2.1 or later for production deployments) and configure it for non-SSL, SSL termination, and end-to-end SSL access of the application URL. Follow these steps to set up Traefik as a load balancer for an Oracle WebCenter Portal domain in a Kubernetes cluster:
Use Helm to install the Traefik (ingress-based) load balancer.
You can use the following values.yaml sample file and set kubernetes.namespaces as required.
$ cd ${WORKDIR}/weblogic-kubernetes-operator
$ kubectl create namespace traefik
$ helm repo add traefik https://containous.github.io/traefik-helm-chart
Sample output:
"traefik" has been added to your repositories
Install Traefik:
$ helm install traefik traefik/traefik \
--namespace traefik \
--values kubernetes/samples/scripts/charts/traefik/values.yaml \
--set "kubernetes.namespaces={traefik}" \
--set "service.type=NodePort" --wait
A sample values.yaml for deployment of Traefik 2.2.x looks like this:
image:
name: traefik
tag: 2.2.8
pullPolicy: IfNotPresent
ingressRoute:
dashboard:
enabled: true
annotations: {}
labels: {}
providers:
kubernetesCRD:
enabled: true
kubernetesIngress:
enabled: true
ports:
traefik:
port: 9000
expose: true
exposedPort: 9000
protocol: TCP
web:
port: 8000
expose: true
exposedPort: 30305
nodePort: 30305
protocol: TCP
websecure:
port: 8443
expose: true
exposedPort: 30443
protocol: TCP
nodePort: 30443
Verify the Traefik status and find the port number of the SSL and non-SSL services:
$ kubectl get all -n traefik
Access the Traefik dashboard through the URL http://$(hostname -f):30070, with the HTTP host traefik.example.com:
$ curl -H "host: $(hostname -f)" http://$(hostname -f):30070/dashboard/
Note: Make sure that you specify a fully qualified node name for
$(hostname -f)
Configure Traefik to manage ingresses created in this namespace. In the following sample, traefik is the Traefik namespace and wcpns is the namespace of the domain:
$ helm upgrade traefik traefik/traefik \
--reuse-values \
--namespace traefik \
--set "kubernetes.namespaces={traefik,wcpns}" \
--wait
Create an ingress for the domain in the domain namespace by using the sample Helm chart. Here path-based routing is used for ingress.
Sample values for default configuration are shown in the file ${WORKDIR}/weblogic-kubernetes-operator/kubernetes/samples/charts/ingress-per-domain/values.yaml.
By default, type is TRAEFIK , tls is Non-SSL. You can override these values by passing values through the command line or edit them in the sample values.yaml file based on the type of configuration (non-SSL or SSL).
If needed, you can update the ingress YAML file to define more path rules (in section spec.rules.host.http.paths) based on the domain application URLs that need to be accessed. The template YAML file for the Traefik (ingress-based) load balancer is located at ${WORKDIR}/weblogic-kubernetes-operator/kubernetes/samples/charts/ingress-per-domain/templates/traefik-ingress.yaml
Install ingress-per-domain using Helm for non-SSL configuration:
$ cd ${WORKDIR}/weblogic-kubernetes-operator
$ helm install wcp-traefik-ingress \
kubernetes/samples/charts/ingress-per-domain \
--namespace wcpns \
--values kubernetes/samples/charts/ingress-per-domain/values.yaml \
--set "traefik.hostname=$(hostname -f)"
Sample output:
NAME: wcp-traefik-ingress
LAST DEPLOYED: Mon Jul 20 11:44:13 2020
NAMESPACE: wcpns
STATUS: deployed
REVISION: 1
TEST SUITE: None
For secured access (SSL) to the Oracle WebCenter Portal application, create a certificate and generate a Kubernetes secret:
$ openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /tmp/tls1.key -out /tmp/tls1.crt -subj "/CN=*"
$ kubectl -n wcpns create secret tls wcpinfra-tls-cert --key /tmp/tls1.key --cert /tmp/tls1.crt
Note: The value of
CNis the host on which this ingress is to be deployed.
Create a Traefik Middleware custom resource
In case of SSL termination, Traefik must pass a custom header WL-Proxy-SSL:true to the WebLogic Server endpoints. Create the Middleware using the following command:
$ cat <<EOF | kubectl apply -f -
apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
name: wls-proxy-ssl
namespace: wcpns
spec:
headers:
customRequestHeaders:
WL-Proxy-SSL: "true"
EOF
Create the Traefik TLSStore custom resource.
In case of SSL termination, Traefik should be configured to use the user-defined SSL certificate. If the user-defined SSL certificate is not configured, Traefik creates a default SSL certificate. To configure a user-defined SSL certificate for Traefik, use the TLSStore custom resource. The Kubernetes secret created with the SSL certificate should be referenced in the TLSStore object. Run the following command to create the TLSStore:
$ cat <<EOF | kubectl apply -f -
apiVersion: traefik.containo.us/v1alpha1
kind: TLSStore
metadata:
name: default
namespace: wcpns
spec:
defaultCertificate:
secretName: wcpinfra-tls-cert
EOF
Install ingress-per-domain using Helm for SSL configuration.
The Kubernetes secret name should be updated in the template file.
The template file also contains the following annotations:
traefik.ingress.kubernetes.io/router.entrypoints: websecure
traefik.ingress.kubernetes.io/router.tls: "true"
traefik.ingress.kubernetes.io/router.middlewares: wcpns-wls-proxy-ssl@kubernetescrd
The entry point for SSL access and the Middleware name should be updated in the annotation. The Middleware name should be in the form <namespace>-<middleware name>@kubernetescrd.
$ cd ${WORKDIR}/weblogic-kubernetes-operator
$ helm install wcp-traefik-ingress \
kubernetes/samples/charts/ingress-per-domain \
--namespace wcpns \
--values kubernetes/samples/charts/ingress-per-domain/values.yaml \
--set "traefik.hostname=$(hostname -f)" \
--set tls=SSL
Sample output:
NAME: wcp-traefik-ingress
LAST DEPLOYED: Mon Jul 20 11:44:13 2020
NAMESPACE: wcpns
STATUS: deployed
REVISION: 1
TEST SUITE: None
For non-SSL access to the Oracle WebCenter Portal application, get the details of the services by the ingress:
$ kubectl describe ingress wcp-domain-traefik -n wcpns
For SSL access to the Oracle WebCenter Portal application, get the details of the services by the above deployed ingress:
$ kubectl describe ingress wcp-domain-traefik -n wcpns
To confirm that the load balancer noticed the new ingress and is successfully routing to the domain server pods, you can send a request to the URL for the WebLogic ReadyApp framework, which should return an HTTP 200 status code, as follows:
$ curl -v http://${LOADBALANCER_HOSTNAME}:${LOADBALANCER_PORT}/weblogic/ready
* Trying 149.87.129.203...
> GET http://${LOADBALANCER_HOSTNAME}:${LOADBALANCER_PORT}/weblogic/ready HTTP/1.1
> User-Agent: curl/7.29.0
> Accept: */*
> Proxy-Connection: Keep-Alive
> host: $(hostname -f)
>
< HTTP/1.1 200 OK
< Date: Sat, 14 Mar 2020 08:35:03 GMT
< Vary: Accept-Encoding
< Content-Length: 0
< Proxy-Connection: Keep-Alive
<
* Connection #0 to host localhost left intact
After setting up the Traefik (ingress-based) load balancer, verify that the domain application URLs are accessible through the non-SSL load balancer port 30305 for HTTP access. The sample URLs for Oracle WebCenter Portal domain are:
http://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-Non-SSLPORT}/webcenter
http://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-Non-SSLPORT}/console
http://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-Non-SSLPORT}/em
http://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-Non-SSLPORT}/rsscrawl
http://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-Non-SSLPORT}/rest
http://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-Non-SSLPORT}/webcenterhelp
After setting up the Traefik (ingress-based) load balancer, verify that the domain applications are accessible through the SSL load balancer port 30443 for HTTPS access. The sample URLs for Oracle WebCenter Portal domain are:
https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/webcenter
https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/console
https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/em
https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/rsscrawl
https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/rest
https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/webcenterhelp
Uninstall and delete the ingress deployment:
$ helm delete wcp-traefik-ingress -n wcpns
Use Helm to install the Traefik (ingress-based) load balancer. You can use the values.yaml sample file and set kubernetes.namespaces as required.
$ cd ${WORKDIR}/weblogic-kubernetes-operator
$ kubectl create namespace traefik
$ helm repo add traefik https://containous.github.io/traefik-helm-chart
Sample output:
"traefik" has been added to your repositories
Install Traefik:
$ helm install traefik traefik/traefik \
--namespace traefik \
--values kubernetes/samples/scripts/charts/traefik/values.yaml \
--set "kubernetes.namespaces={traefik}" \
--set "service.type=NodePort" --wait
Verify the Traefik operator status and find the port number of the SSL and non-SSL services:
$ kubectl get all -n traefik
Access the Traefik dashboard through the URL http://$(hostname -f):31288, with the HTTP host traefik.example.com:
$ curl -H "host: $(hostname -f)" http://$(hostname -f):31288/dashboard/
Note: Make sure that you specify a fully qualified node name for
$(hostname -f).
Configure Traefik to manage the domain application service created in this namespace. In the following sample, traefik is the Traefik namespace and wcpns is the namespace of the domain:
$ helm upgrade traefik traefik/traefik --namespace traefik --reuse-values \
--set "kubernetes.namespaces={traefik,wcpns}"
For each backend service, create different ingresses, as Traefik does not support multiple paths or rules with annotation ssl-passthrough. For example, for wcp-domain-adminserver and wcp-domain-cluster-wcp-cluster, different ingresses must be created.
To enable SSL passthrough in Traefik, you can configure a TCP router. A sample YAML for IngressRouteTCP is available at ${WORKDIR}/weblogic-kubernetes-operator/kubernetes/samples/charts/ingress-per-domain/tls/traefik-tls.yaml. The following should be updated in traefik-tls.yaml:
services.HostSNI rule.Sample traefik-tls.yaml:
apiVersion: traefik.containo.us/v1alpha1
kind: IngressRouteTCP
metadata:
name: wcp-domain-cluster-routetcp
namespace: wcpns
spec:
entryPoints:
- websecure
routes:
- match: HostSNI(`${LOADBALANCER_HOSTNAME}`)
services:
- name: wcp-domain-cluster-wcp-cluster
port: 8888
weight: 3
TerminationDelay: 400
tls:
passthrough: true
Create the IngressRouteTCP:
$ kubectl apply -f traefik-tls.yaml
Verify the access to application URLs exposed through the configured service. The configured WCP cluster service enables you to access the following WCP domain URLs:
https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/webcenter
https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/rsscrawl
https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/rest
https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/webcenterhelp
$ helm delete traefik -n traefik
$ cd weblogic-kubernetes-operator/kubernetes/samples/charts/ingress-per-domain/tls
$ kubectl delete -f traefik-tls.yaml