test.yml

apiVersion: v1
kind: ConfigMap
metadata:
  name: test-args
data:
  URL: api.ipify.org
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: test-script
data:
  test.sh: |
    while true
    do
        IP=$(curl --silent $URL)
        echo "Public IP Address: $IP"
        sleep 1
    done
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nat-gateway
  labels:
    app: nat-gateway
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nat-gateway
  strategy:
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
  minReadySeconds: 5
  template:
    metadata:
      labels:
        app: nat-gateway
    spec:
      topologySpreadConstraints:
      - maxSkew: 1
        topologyKey: topology.kubernetes.io/zone
        whenUnsatisfiable: DoNotSchedule
        labelSelector:
          matchLabels:
            app: nat-gateway
      - maxSkew: 1
        topologyKey: kubernetes.io/hostname
        whenUnsatisfiable: DoNotSchedule
        labelSelector:
          matchLabels:
            app: nat-gateway
      nodeSelector:
        "beta.kubernetes.io/os": linux
      containers:
      - name: nginx
        image: nginx
        command:
        - /bin/sh
        - -c
        - |
          /scripts/test.sh
        resources:
          requests:
            memory: "64Mi"
            cpu: "250m"
          limits:
            memory: "128Mi"
            cpu: "500m"
        env:
        - name: URL
          valueFrom:
            configMapKeyRef:
              name: test-args
              key: URL
        volumeMounts:
        - mountPath: /scripts
          name: test-script
          readOnly: true
      volumes:
      - name: test-script
        configMap:
          name: test-script
          defaultMode: 0777