deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: app
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1
      maxSurge: 1
  template:
    metadata:
      labels:
        app: app
    spec:
      containers:
      - name: twitter
        image: georgi86/twitter:latest
        env:
        - name: TWITTER_CONSUMER_KEY
          valueFrom:
            secretKeyRef:
              name: twitter-credentials
              key: consumer_key
        - name: TWITTER_CONSUMER_SECRET
          valueFrom:
            secretKeyRef:
              name: twitter-credentials
              key: consumer_secret
        - name: TWITTER_ACCESS_TOKEN
          valueFrom:
            secretKeyRef:
              name: twitter-credentials
              key: access_token
        - name: TWITTER_ACCESS_TOKEN_SECRET
          valueFrom:
            secretKeyRef:
              name: twitter-credentials
              key: access_token_secret
        ports:
        - containerPort: 5000
        readinessProbe:
          httpGet:
            path: /
            port: 5000
          initialDelaySeconds: 5
          periodSeconds: 10
        livenessProbe:
          httpGet:
            path: /
            port: 5000
          initialDelaySeconds: 15
          periodSeconds: 20
        resources:
          requests:
            memory: "64Mi"
            cpu: "250m"
          limits:
            memory: "128Mi"
            cpu: "500m"
      topologySpreadConstraints:
      - maxSkew: 1
        topologyKey: "topology.kubernetes.io/zone"
        whenUnsatisfiable: DoNotSchedule
        labelSelector:
          matchLabels:
            app: app