NetScaler ingress controller

Establish network between Kubernetes nodes and Ingress NetScaler using node controller

December 31, 2023

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In Kubernetes environments, when you expose the services for external access through the Ingress device you need to appropriately configure the network between the Kubernetes nodes and the Ingress device.

Configuring the network is challenging as the pods use private IP addresses based on the CNI framework. Without proper network configuration, the Ingress device cannot access these private IP addresses. Also, manually configuring the network to ensure such reachability is cumbersome in Kubernetes environments.

Also, if the Kubernetes cluster and the Ingress NetScaler are in different subnets, you cannot establish a route between them using Static routing. This scenario requires an overlay mechanism to establish a route between the Kubernetes cluster and the Ingress NetScaler.

NetScaler provides a node controller that you can use to create a VXLAN based overlay network between the Kubernetes nodes and the Ingress NetScaler as shown in the following diagram:

CIC with CNC

Note:

NetScaler Node Controller does not work in a setup where a NetScaler cluster is configured as an ingress device. NetScaler Node Controller requires to establish a Virtual Extensible LAN (VXLAN) tunnel between NetScaler and Kubernetes nodes to configure routes and creating a VXLAN on a NetScaler cluster is not supported.

To establish network connectivity using node controller:

Deploy the NetScaler Ingress Controller. Perform the following steps:
1. Download the citrix-k8s-ingress-controller.yaml using the following command:
```
wget  https://raw.githubusercontent.com/citrix/citrix-k8s-ingress-controller/master/deployment/baremetal/citrix-k8s-ingress-controller.yaml
```
2. Edit the citrix-k8s-ingress-controller.yaml file and enter the values for the environmental variables. For more information, see Deploy the NetScaler Ingress Controller.
3. Once you update the environment variables, save the YAML file and deploy it using the following command:
```
kubectl create -f citrix-k8s-ingress-controller.yaml
```
4. Verify if the NetScaler Ingress Controller is deployed successfully using the following command:
```
kubectl get pods --all-namespaces
```
Deploy the node controller. For information on how to deploy the node controller, see Deploy the Citrix k8s node controller.

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Establish network between Kubernetes nodes and Ingress NetScaler using node controller

December 31, 2023

Contributed by:

December 31, 2023

Contributed by:

Establish network between Kubernetes nodes and Ingress NetScaler using node controller

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