Oracle Fusion Middleware on Kubernetes > Oracle SOA Suite > Administration Guide > Set up a load balancer > Traefik

Traefik

This section provides information about how to install and configure the ingress-based Traefik load balancer (version 2.2.1 or later for production deployments) to load balance Oracle SOA Suite domain clusters. You can configure Traefik for non-SSL and SSL termination access of the application URL.

Follow these steps to set up Traefik as a load balancer for an Oracle SOA Suite domain in a Kubernetes cluster:

Non-SSL and SSL termination
End-to-end SSL configuration

Non-SSL and SSL termination

Install the Traefik (ingress-based) load balancer

Use Helm to install the Traefik (ingress-based) load balancer. Use the values.yaml file in the sample but set kubernetes.namespaces specifically.

 $ 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

Click here to see the sample output.

A sample values.yaml for deployment of Traefik 2.2.x:

image:
name: traefik
tag: 2.2.8
pullPolicy: IfNotPresent
ingressRoute:
dashboard:
   enabled: true
   # Additional ingressRoute annotations (e.g. for kubernetes.io/ingress.class)
   annotations: {}
   # Additional ingressRoute labels (e.g. for filtering IngressRoute by custom labels)
   labels: {}
providers:
kubernetesCRD:
   enabled: true
kubernetesIngress:
   enabled: true
   # IP used for Kubernetes Ingress endpoints
ports:
traefik:
   port: 9000
   expose: true
   # The exposed port for this service
   exposedPort: 9000
   # The port protocol (TCP/UDP)
   protocol: TCP
web:
   port: 8000
   # hostPort: 8000
   expose: true
   exposedPort: 30305
   nodePort: 30305
   # The port protocol (TCP/UDP)
   protocol: TCP
   # Use nodeport if set. This is useful if you have configured Traefik in a
   # LoadBalancer
   # nodePort: 32080
   # Port Redirections
   # Added in 2.2, you can make permanent redirects via entrypoints.
   # https://docs.traefik.io/routing/entrypoints/#redirection
   # redirectTo: websecure
websecure:
   port: 8443
#    # hostPort: 8443
   expose: true
   exposedPort: 30443
   # The port protocol (TCP/UDP)
   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

Click here to see the sample output.

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 ingresses

Configure Traefik to manage ingresses created in this namespace, where traefik is the Traefik namespace and soans is the namespace of the domain:

    $ helm upgrade traefik traefik/traefik --namespace traefik     --reuse-values \
    --set "kubernetes.namespaces={traefik,soans}"

Click here to see the sample output.

Create an ingress for the domain

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, and domainType is soa. These values can be overridden by passing values through the command line or can be edited in the sample file values.yaml 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 soa-traefik-ingress  \
     kubernetes/samples/charts/ingress-per-domain \
     --namespace soans \
     --values kubernetes/samples/charts/ingress-per-domain/values.yaml \
     --set "traefik.hostname=$(hostname -f)"

Sample output:

  NAME: soa-traefik-ingress
  LAST DEPLOYED: Mon Jul 20 11:44:13 2020
  NAMESPACE: soans
  STATUS: deployed
  REVISION: 1
  TEST SUITE: None

For secured access (SSL) to the Oracle SOA Suite 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 soans create secret tls soainfra-tls-cert --key /tmp/tls1.key --cert /tmp/tls1.crt

Create 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: soans
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 will create 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: soans
spec:
  defaultCertificate:
    secretName:  soainfra-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: soans-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 soa-traefik-ingress  \
     kubernetes/samples/charts/ingress-per-domain \
     --namespace soans \
     --values kubernetes/samples/charts/ingress-per-domain/values.yaml \
     --set "traefik.hostname=$(hostname -f)" \
     --set tls=SSL

Sample output:

  NAME: soa-traefik-ingress
  LAST DEPLOYED: Mon Jul 20 11:44:13 2020
  NAMESPACE: soans
  STATUS: deployed
  REVISION: 1
  TEST SUITE: None

For non-SSL access to the Oracle SOA Suite application, get the details of the services by the ingress:

  $ kubectl describe ingress soainfra-traefik -n soans

Click here to see all services supported by the above deployed ingress.

For SSL access to the Oracle SOA Suite application, get the details of the services by the above deployed ingress:

 $ kubectl describe ingress soainfra-traefik -n soans

Click here to see all services supported by the above deployed ingress.

  ```
  Name:             soainfra-traefik
  Namespace:        soans
  Address:
  Default backend:  default-http-backend:80 (<error: endpoints "default-http-backend" not found>)
  TLS:
  soainfra-tls-cert terminates www.example.com
  Rules:
  Host                    Path  Backends
  ----                    ----  --------
  www.example.com
                          /console                   soainfra-adminserver:7001 ()
                          /em                        soainfra-adminserver:7001 ()
                          /weblogic/ready            soainfra-adminserver:7001 ()
                                                     soainfra-cluster-soa-cluster:8001 ()
                          /soa-infra                 soainfra-cluster-soa-cluster:8001 ()
                          /soa/composer              soainfra-cluster-soa-cluster:8001 ()
                          /integration/worklistapp   soainfra-cluster-soa-cluster:8001 ()
  Annotations:              kubernetes.io/ingress.class: traefik
                          meta.helm.sh/release-name: soa-traefik-ingress
                          meta.helm.sh/release-namespace: soans
                          traefik.ingress.kubernetes.io/router.entrypoints: websecure
                          traefik.ingress.kubernetes.io/router.middlewares: soans-wls-proxy-ssl@kubernetescrd
                          traefik.ingress.kubernetes.io/router.tls: true
  Events:                   <none>
  ```

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

Verify domain application URL access

For non-SSL configuration

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 SOA Suite domain of type soa are:

    http://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-Non-SSLPORT}/weblogic/ready
    http://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-Non-SSLPORT}/console
    http://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-Non-SSLPORT}/em
    http://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-Non-SSLPORT}/soa-infra
    http://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-Non-SSLPORT}/soa/composer
    http://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-Non-SSLPORT}/integration/worklistapp

For SSL configuration

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 SOA Suite domain of type soa are:

    https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/weblogic/ready
    https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/console
    https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/em
    https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/soa-infra
    https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/soa/composer
    https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/integration/worklistapp

Uninstall the Traefik ingress

Uninstall and delete the ingress deployment:

$ helm delete soa-traefik-ingress  -n soans

End-to-end SSL configuration

Install the Traefik load balancer for end-to-end SSL

Use Helm to install the Traefik (ingress-based) load balancer. Use the values.yaml file in the sample but set kubernetes.namespaces specifically.

 $ 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/charts/traefik/values.yaml \
 --set  "kubernetes.namespaces={traefik}" \
 --set "service.type=NodePort" --wait

Click here to see the sample output.

Verify the Traefik operator status and find the port number of the SSL and non-SSL services:

 $ kubectl get all -n traefik

Click here to see the sample output.

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

Configure Traefik to manage the domain application service created in this namespace, where traefik is the Traefik namespace and soans is the namespace of the domain:

      $ helm upgrade traefik traefik/traefik --namespace traefik     --reuse-values \
         --set "kubernetes.namespaces={traefik,soans}"

Click here to see the sample output.

Create IngressRouteTCP

To enable SSL passthrough in Traefik, you can configure a TCP router. A sample YAML for IngressRouteTCP is available at ${WORKDIR}/weblogic-kubernetes-operator/kubernetes/samples/charts/ingress-per-domain/tls/traefik-tls.yaml. The following should be updated in traefik-tls.yaml:
- The service name and the SSL port should be updated in the Services.
- The load balancer hostname should be updated in the HostSNI rule.
Sample traefik-tls.yaml:
```
apiVersion: traefik.containo.us/v1alpha1
kind: IngressRouteTCP
metadata:
  name: soa-cluster-routetcp
  namespace: soans
spec:
  entryPoints:
    - websecure
  routes:
  - match: HostSNI(`${LOADBALANCER_HOSTNAME}`)
    services:
    - name: soainfra-cluster-soa-cluster
      port: 8002
      weight: 3
      TerminationDelay: 400
  tls:
    passthrough: true
```
Create the IngressRouteTCP:
```
$ kubectl apply -f traefik-tls.yaml
```

Verify end-to-end SSL access

Verify the access to application URLs exposed through the configured service. Because the SOA cluster service is configured, you should be able to access the following SOA domain URLs:

https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/soa-infra/
https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/soa/composer
https://${LOADBALANCER_HOSTNAME}:${LOADBALANCER-SSLPORT}/integration/worklistapp

Uninstall Traefik

$ helm delete traefik -n traefik