deployment.yml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: left
  labels:
    app: left
spec:
  replicas: 1
  selector:
    matchLabels:
      app: left
  template:
    metadata:
      labels:
        app: left
    spec:
      containers:
      - name: nginx
        image: nginx:1.25
        volumeMounts:
          - name: conf
            mountPath: /etc/nginx/nginx.conf
            subPath: nginx.conf
            readOnly: true
      volumes:
        - name: conf
          configMap:
            name: left-conf
            items:
              - key: nginx.conf
                path: nginx.conf
---
apiVersion: v1
kind: Service
metadata:
  name: left
spec:
  selector:
    app: left
  ports:
    - port: 80
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: left-conf
data:
  nginx.conf: |
    events {
        worker_connections  1024;
    }
    http {
        server {
            location / {
                default_type text/plain;
                return 200 "left\n";
            }
        }
    }
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: right
  labels:
    app: right
spec:
  replicas: 1
  selector:
    matchLabels:
      app: right
  template:
    metadata:
      labels:
        app: right
    spec:
      containers:
      - name: nginx
        image: nginx:1.23
        volumeMounts:
          - name: conf
            mountPath: /etc/nginx/nginx.conf
            subPath: nginx.conf
            readOnly: true
      volumes:
        - name: conf
          configMap:
            name: right-conf
            items:
              - key: nginx.conf
                path: nginx.conf
---
apiVersion: v1
kind: Service
metadata:
  name: right
spec:
  selector:
    app: right
  ports:
    - port: 80
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: right-conf
data:
  nginx.conf: |
    events {
        worker_connections  1024;
    }
    http {
        server {
            location / {
                default_type text/plain;
                return 200 "right\n";
            }
        }
    }