Create Discovery Service for NCache Clients in AKS
Inside an AKS cluster, every pod is assigned with a dynamic IP address that is unknown to every other pod. To make sure that your client application creates a connection with NCache servers successfully, you need a service that exposes the NCache deployment pod's IP address for your application. So you need to create a headless discovery service that gives client application access to the pods running the cache service inside the Azure Kubernetes cluster.
Create Discovery Service YAML File
Create a YAML file for headless discovery service. Let's call this file discoveryservice.yaml and this is what it should look like:
The parameters required to create this YAML file ready to be deployed are mentioned in the Properties table.
kind: Service apiVersion: v1 # it depends on the underlying Kubernetes version metadata: name: cacheserver labels: app: cacheserver spec: clusterIP: None selector: app: ncache # same label as provided in the ncache YAML file ports: - name: management-tcp port: 8250 targetPort: 8250 - name: client-port port: 9800 targetPort: 9800
clusterIP tag equals none, meaning that this service will not have any public IP assigned to it. This is what makes this service a headless service.
Create Discovery Service
- Run the following command to create a discovery service that the AKS cluster uses to provide a communication channel between NCache servers and client applications.
kubectl create -f [dir]/discoveryservice.yaml
- After all required services have been deployed, you can check whether the created pods are live or not by running the following command in Azure Cloud Shell:
kubectl get pods -o wide
- To get a list of all deployed services, run the following command:
kubectl get service
After the successful creation of the cache discovery service, the next step is to create a Gateway Service in AKS, as explained in the next chapter.