K8S deployment manifests for a dummy lightweight SMTP email server (smtp4dev) with WebUI useful for development and testing

smtp4dev_k8s_manifests.yaml

---
apiVersion: v1
kind: Service
metadata:
  name: smtp4dev
spec:
  type: NodePort
  selector:
    app: smtp4dev
  ports:
    - name: smtp
      protocol: TCP
      port: 25
      targetPort: 25
    - name: http
      protocol: TCP
      port: 80
      targetPort: 80
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: smtp4dev
  labels:
    app: smtp4dev
spec:
  replicas: 1
  selector:
    matchLabels:
      app: smtp4dev
  template:
    metadata:
      labels:
        app: smtp4dev
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
              - matchExpressions:
                  - key: kubernetes.io/os
                    operator: In
                    values:
                      - linux
      containers:
        - name: smtp4dev
          image: rnwood/smtp4dev:3.2.0-ci20221023104
          ports:
            - containerPort: 80
            - containerPort: 25

Get IP address of the smtp4dev Service:

kubectl get svc smtp4dev -ojsonpath="{.spec.clusterIP}"

Get external SMTP port of the smtp4dev Service:

kubectl get svc smtp4dev -ojsonpath="{.spec.ports[?(@.name=='smtp')].nodePort}"

Get external HTTP port of the smtp4dev Service:

kubectl get svc smtp4dev -ojsonpath="{.spec.ports[?(@.name=='http')].nodePort}"