TIS0701 - Deployment Exposing the Same Port as the Service Not Found

A Deployment exposing the same port as the Service is not found.

Recommendation: Ensure Service and Deployment Ports Match

To ensure proper traffic flow and connectivity between services and workloads, always ensure that the targetPort in the Service matches the containerPort in the corresponding Deployment.

Examples

1. Service and Deployment Port Mismatch

   Service:

   apiVersion: v1
   kind: Service
   metadata:
     name: my-service
     namespace: example-namespace
   spec:
     ports:
     - port: 80
       targetPort: 8080

   Deployment:

   apiVersion: apps/v1
   kind: Deployment
   metadata:
     name: my-deployment
     namespace: example-namespace
   spec:
     selector:
       matchLabels:
         app: my-app
     template:
       metadata:
         labels:
           app: my-app
       spec:
         containers:
         - name: my-container
           image: my-image
           ports:
           - containerPort: 9090

   Explanation: The Service is configured to target port 8080 in the workload, but the Deployment exposes port 9090. This mismatch means that the service cannot properly route traffic to the intended workload, resulting in failed connections.

Recommendation

Ensure the port definitions in the workload and service definitions match.

1. Update Deployment to Match the Service Port

   Update the Deployment to expose the correct port that matches the Service definition.

   apiVersion: apps/v1
   kind: Deployment
   metadata:
     name: my-deployment
     namespace: example-namespace
   spec:
     selector:
       matchLabels:
         app: my-app
     template:
       metadata:
         labels:
           app: my-app
       spec:
         containers:
         - name: my-container
           image: my-image
           ports:
           - containerPort: 8080

   Explanation: By updating the containerPort to 8080, the Deployment now matches the targetPort defined in the Service, allowing traffic to be correctly routed from the service to the workload.