Call endpoint from Kubernetes Cron Job

CronJobs are a good choice. Here's a quick layout that runs 3 nginx pods accepting all traffic. Every minute, a Job curls 1 of the 3 pods (always the same pod).

apiVersion: apps/v1beta1kind: Deploymentmetadata:  name: main  labels:    app: nginxspec:  replicas: 2  selector:    matchLabels:      app: nginx  template:    metadata:      labels:        app: nginx    spec:      containers:      - name: nginx        image: nginx:1.7.9        ports:        - containerPort: 80---apiVersion: apps/v1beta1kind: Deploymentmetadata:  name: singleton  labels:    app: nginx    special: singletonspec:  replicas: 1  selector:    matchLabels:      app: nginx      special: singleton  template:    metadata:      labels:        app: nginx        special: singleton    spec:      containers:      - name: nginx        image: nginx:1.7.9        ports:        - containerPort: 80---kind: ServiceapiVersion: v1metadata:  name: allpodsspec:  selector:    app: nginx  ports:  - protocol: TCP    port: 80    targetPort: 80---kind: ServiceapiVersion: v1metadata:  name: singletonspec:  selector:    special: singleton  ports:  - protocol: TCP    port: 80    targetPort: 80---apiVersion: batch/v1beta1kind: CronJobmetadata:  name: calloutspec:  schedule: "*/1 * * * *"  concurrencyPolicy: Forbid  successfulJobsHistoryLimit: 1  failedJobsHistoryLimit: 1  jobTemplate:    spec:      template:        spec:          containers:          - name: callout            image: buildpack-deps:curl            args:            - /bin/sh            - -ec            - curl http://singleton          restartPolicy: Never