Oracle Fusion Middleware on Kubernetes > Oracle WebCenter Sites > 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 WebCenter Sites domain clusters. You can configure Traefik for access of the application URL.

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

Setting Up Loadbalancer Traefik for the WebCenter Sites Domain on K8S

Follow these steps to set up Traefik as a loadbalancer for the Oracle WebCenter Sites domain:

Install the Traefik Load Balancer
Configure Traefik to Manage Ingresses
Create an Ingress for the Domain
Verify that You can Access the Domain URL

Install the Traefik Load Balancer

Use helm to install the Traefik load balancer. For detailed information, see this document. Use the values.yaml file in the sample but set kubernetes.namespaces specifically.

Add the repo

$ cd ${WORKDIR}/weblogic-kubernetes-operator
$ kubectl create namespace traefik
$ helm repo add traefik https://containous.github.io/traefik-helm-chart

Update the repo

$ helm repo update

Helm Install for Traefik

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

NAME:traefik-operator
LAST DEPLOYED: Fri Jun 19 00:17:57 2020
NAMESPACE: traefik
STATUS: deployed
REVISION: 1
TEST SUITE: None

Access the Traefik dashboard through the URL http://$(hostname -f):30305, with the HTTP host traefik.example.com. NOTE: Make sure you specify full qualified node name for $(hostname -f).
```
$ curl -H 'host: $(hostname -f)' http://$(hostname -f):30305/
<a href="/dashboard/">Found</a>.
$
```

Configure Traefik to Manage Ingresses

Configure Traefik to manage Ingresses created in this namespace: Note: Here traefik is the Traefik namespace, wcsites-ns is the namespace of the domain.

Helm upgrade for traefik

$ helm upgrade traefik traefik/traefik --namespace traefik     --reuse-values \
    --set "kubernetes.namespaces={traefik,wcsites-ns}"
 
 
NAME:traefik-operator
LAST DEPLOYED: Fri Jun 19 00:18:50 2020
NAMESPACE: traefik
STATUS: deployed
REVISION: 2
TEST SUITE: None

Create an Ingress for the Domain

Create an Ingress for the domain (ingress-per-domain-wcsites), in the domain namespace by using the sample Helm chart. Here we are using the path-based routing for ingress. For detailed instructions about ingress, see this page).

For now, you can update the kubernetes/create-wcsites-domain/ingress-per-domain/values.yaml with appropriate values. Sample values are shown below:

$ cat kubernetes/create-wcsites-domain/ingress-per-domain/values.yaml
   
# Copyright 2020, Oracle Corporation and/or its affiliates.
# Licensed under the Universal Permissive License v 1.0 as shown at https://oss.oracle.com/licenses/upl.

# Default values for ingress-per-domain.
# This is a YAML-formatted file.
# Declare variables to be passed into your templates.

apiVersion: networking.k8s.io/v1beta1

# Load balancer type.  Supported values are: TRAEFIK, NGINX
type: TRAEFIK
#type: NGINX

# WLS domain as backend to the load balancer
wlsDomain:
  domainUID: wcsitesinfra
  adminServerName: adminserver
  adminServerPort: 7001
  wcsitesClusterName: wcsites_cluster
  wcsitesManagedServerPort: 8001


# Ngnix specific values
ngnix:
  #connect timeout
  connectTimeout: 1800s
  #read timeout
  readTimeout: 1800s
  #send timeout
  sendTimeout: 1800s

Update the kubernetes/create-wcsites-domain/ingress-per-domain/templates/traefik-ingress.yaml with the url routes to be load balanced.

Below are the defined ingress rules:

NOTE: This is not an exhaustive list of rules. You can enhance it based on the application urls that need to be accessed externally. These rules hold good for domain type WCSITES.

$ vi kubernetes/create-wcsites-domain/ingress-per-domain/templates/traefik-ingress.yaml
   
# Copyright 2020, Oracle Corporation and/or its affiliates.
# Licensed under the Universal Permissive License v 1.0 as shown at https://oss.oracle.com/licenses/upl.

{{- if eq .Values.type "TRAEFIK" }}
---
apiVersion: {{ .Values.apiVersion }}
kind: Ingress
metadata:
  name: {{ .Values.wlsDomain.domainUID }}-traefik
  namespace: {{ .	Release.Namespace }}
  labels:
    weblogic.resourceVersion: domain-v2
  annotations:
    kubernetes.io/ingress.class: traefik
  rules:
spec:
  - host: '{{ .Values.traefik.hostname }}'
    http:
      paths:
      - path: /console
        backend:
          serviceName: '{{ .Values.wlsDomain.domainUID }}-{{ .Values.wlsDomain.adminServerName | lower | replace "_" "-" }}'
          servicePort: {{ .Values.wlsDomain.adminServerPort }}
      - path: /em
        backend:
          serviceName: '{{ .Values.wlsDomain.domainUID }}-{{ .Values.wlsDomain.adminServerName | lower | replace "_" "-" }}'
          servicePort: {{ .Values.wlsDomain.adminServerPort }}
      - path: /wls-exporter
        backend:
          serviceName: '{{ .Values.wlsDomain.domainUID }}-{{ .Values.wlsDomain.adminServerName | lower | replace "_" "-" }}'
          servicePort: {{ .Values.wlsDomain.adminServerPort }}
      - path: /weblogic
        backend:
          serviceName: '{{ .Values.wlsDomain.domainUID }}-{{ .Values.wlsDomain.adminServerName | lower | replace "_" "-" }}'
          servicePort: {{ .Values.wlsDomain.adminServerPort }}
      - path: /sbconsole
        backend:
          serviceName: '{{ .Values.wlsDomain.domainUID }}-{{ .Values.wlsDomain.adminServerName | lower | replace "_" "-" }}'
          servicePort: {{ .Values.wlsDomain.adminServerPort }}
      - path: /sites
        backend:
          serviceName: '{{ .Values.wlsDomain.domainUID }}-cluster-{{ .Values.wlsDomain.wcsitesClusterName | lower | replace "_" "-" }}'
          servicePort: {{ .Values.wlsDomain.wcsitesManagedServerPort }}
      - path: /cas
        backend:
          serviceName: '{{ .Values.wlsDomain.domainUID }}-cluster-{{ .Values.wlsDomain.wcsitesClusterName | lower | replace "_" "-" }}'
          servicePort: {{ .Values.wlsDomain.wcsitesManagedServerPort }}
      - path: /wls-exporter
        backend:
          serviceName: '{{ .Values.wlsDomain.domainUID }}-cluster-{{ .Values.wlsDomain.wcsitesClusterName | lower | replace "_" "-" }}'
          servicePort: {{ .Values.wlsDomain.wcsitesManagedServerPort }}
 #     - path: /wls-cat
 #       backend:
 #         serviceName: '{{ .Values.wlsDomain.domainUID }}-cluster-{{ .Values.wlsDomain.wcsitesClusterName | lower | replace "_" "-" }}'
 #         servicePort: {{ .Values.wlsDomain.wcsitesManagedServerPort }}
 #     - path:
 #       backend:
 #         serviceName: '{{ .Values.wlsDomain.domainUID }}-cluster-{{ .Values.wlsDomain.wcsitesClusterName | lower | replace "_" "-" }}'
 #         servicePort: {{ .Values.wlsDomain.wcsitesManagedServerPort }}
{{- end }}

Install “ingress-per-domain” using helm.

Helm Install ingress-per-domain

$ helm install wcsitesinfra-ingress kubernetes/create-wcsites-domain/ingress-per-domain \
--namespace wcsites-ns \
--values kubernetes/create-wcsites-domain/ingress-per-domain/values.yaml \
--set "traefik.hostname=$(hostname -f)"

NAME: wcsitesinfra-ingress
LAST DEPLOYED: Fri Jun 19 00:18:50 2020
NAMESPACE: wcsites-ns
STATUS: deployed
REVISION: 1
TEST SUITE: None

To confirm that the load balancer noticed the new Ingress and is successfully routing to the domain’s server pods, you can send a request to the URL for the “WebLogic ReadyApp framework” which should return a HTTP 200 status code, as shown in the example below:

-bash-4.2$ 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 that You can Access the Domain URL

After setting up the Traefik loadbalancer, verify that the domain applications are accessible through the loadbalancer port 30305. Through load balancer (Traefik port 30305), the following URLs are available for setting up domains of WebCenter Sites domain types:

http://${LOADBALANCER-HOSTNAME}:${LOADBALANCER-PORT}/weblogic/ready
http://${LOADBALANCER-HOSTNAME}:${LOADBALANCER-PORT}/console
http://${LOADBALANCER-HOSTNAME}:${LOADBALANCER-PORT}/em
http://${LOADBALANCER-HOSTNAME}:${LOADBALANCER-PORT}/sites/version.jsp