test K8s service loadbalancing. Deploys a client pod, a webserver deployment with 2 replicas, as well as a *stateful* and a *stateless* service to the webserver pods

service-loadbalancing.yml

---
# Use curl to test service loadbalancing on stateful and stateless services:
### simple:
# oc exec client -- curl -sS http://stateless:8080 
#
### automated:
# for i in $(seq 1 100); do oc exec client -- curl -sS http://stateless:8080 | head -n1; sleep 1; done
# for i in $(seq 1 100); do oc exec client -- curl -sS http://stateful:8080 | head -n1; sleep 1; done

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: client
  name: client
spec:
  containers:
  - args:
    - sleep
    - infinity
    image: rhel7/rhel-tools
    name: client
    resources: {}
  dnsPolicy: ClusterFirst
  restartPolicy: Always
---
apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: webserver
  name: webserver
spec:
  replicas: 2
  selector:
    matchLabels:
      app: webserver
  strategy: {}
  template:
    metadata:
      labels:
        app: webserver
    spec:
      containers:
      - image: docker.io/traefik/whoami:latest
        name: whoami
        args:
        - "--port"
        - "8080"
---
apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  labels:
    app: webserver
  name: stateless
spec:
  ports:
  - port: 8080
    protocol: TCP
    targetPort: 8080
  selector:
    app: webserver
---
apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  labels:
    app: webserver
  name: stateful
spec:
  ports:
  - port: 8080
    protocol: TCP
    targetPort: 8080
  selector:
    app: webserver
  sessionAffinity: ClientIP