What processes or actions need to be performed in Kubernetes to start sending requests by a service?

To initiate request sending by a service in Kubernetes, several key steps must be followed:

1. Create a Deployment — define and run pods with the necessary container that will perform the request sending logic.

2. Configure a Service — create a Service object that provides stable access to the pods (for example, ClusterIP for internal access).

3. Configure network policies (if needed) — allow traffic from the pod to the required addresses or services.

4. Check DNS configuration and name resolution — so that the service can communicate with other services by name.

5. Set environment variables or ConfigMap/Secret — to pass connection parameters and configuration.

6. Run the pods and check logs — ensure that the service has started successfully and is sending requests.

Example Deployment manifest for a service that sends requests:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: request-sender
spec:
  replicas: 2
  selector:
    matchLabels:
      app: request-sender
  template:
    metadata:
      labels:
        app: request-sender
    spec:
      containers:
      - name: sender
        image: myapp/request-sender:latest
        env:
        - name: TARGET_URL
          value: "http://target-service"

And a Service for internal cluster access:

apiVersion: v1
kind: Service
metadata:
  name: request-sender
spec:
  selector:
    app: request-sender
  ports:
  - protocol: TCP
    port: 80
    targetPort: 8080
  type: ClusterIP