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NetScaler ingress controller
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Service class for services of type LoadBalancer

December 31, 2023
Contributed by: 
C

When services of type LoadBalancer are deployed, all such services are processed by the NetScaler Ingress Controller and configured on NetScalers. However, there may be situations where you want to associate only specific services to a NetScaler Ingress Controller if multiple Ingress controllers are deployed.

For Ingress resources this functionality is already available using the Ingress class feature. Similar to the Ingress class functionality for Ingress resources, service class functionality is now added for services of type LoadBalancer.

You can associate a NetScaler Ingress Controller with multiple service classes using the --service-classes argument under the spec section of the YAML file. If a service class is not specified for the ingress controller, then it accepts all services of the type LoadBalancer irrespective of the presence of the service.citrix.com/class annotation in the service.

If the service class is specified to the NetScaler Ingress Controller, then it accepts only those services of the type LoadBalancer that match the service.citrix.com/class annotation. In this case, the NetScaler Ingress Controller does not process a type LoadBalancer service if it is not associated with the service.citrix.com/class annotation.

Sample YAML configurations with service classes

Following is a snippet from a sample YAML file to associate service-classes with the Ingress Controller. In this snippet, the following service classes are associated with the Ingress Controller.

  • svc-class1
  • svc-class2
spec:
serviceAccountName: cic-k8s-role
containers:
- name: cic-k8s-ingress-controller
  # specify the service classes to be supported by NetScaler Ingress Controller in args section.
  # First line should be --service-classes, and every subsequent line should be
  # the name of allowed service class. In the given example two classes named
  # "svc-class1" and "svc-class2" are accepted. This will be case-insensitive.
  args:
    - --service-classes
      svc-class1
      svc-class2
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Following is a snippet from a type LoadBalancer service definition YAML file where the service class association is depicted. In this example, an Apache service is associated with the service class svc-class1. If the NetScaler Ingress Controller is configured to accept svc-class1, it configures the service on the NetScaler.

apiVersion: v1
kind: Service
metadata:
     name: apache
     annotations:
         service.citrix.com/class: 'svc-class1'
     labels:
        name: apache
spec:
   type: LoadBalancer
   selector:
       name: apache
   ports:
   - name: http
     port: 80
     targetPort: http
   selector:
   app: apache
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Service class for services of type LoadBalancer
December 31, 2023
Contributed by: 
C
December 31, 2023
Contributed by: 
C

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