容器级别：
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
annotations:
deployment.kubernetes.io/revision: '1'
labels:
app: redis1202
chart: redis-1.1.15
heritage: Tiller
release: redis-instance
name: redis1202
spec:
containers:
- name: redis1202
image: redis:1202
ports:
- containerPort: 6379
hostPort: 6381
name: redis
protocol: TCP
Pod级别（Pod级别的话，hostPort默认即为containerPort，即容器内端口直接映射到node端口，无需修改，即使在yaml里面添加了hostPort指定端口，指定的端口也必须跟containerPort一致！）
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
annotations:
deployment.kubernetes.io/revision: '1'
labels:
app: redis1202
chart: redis-1.1.15
heritage: Tiller
release: redis-instance
name: redis1202
spec:
hostNetwork: true
containers:
- name: redis1202
image: redis:1202
ports:
- containerPort: 6379
hostPort: 6381
name: redis
protocol: TCP
除此方法外，也可通过Service映射端口的方式，让外部访问，即NodePort的方式
apiVersion: v1
kind: Service
metadata:
creationTimestamp: null
labels:
app: redis1202
chart: redis-1.1.15
heritage: Tiller
release: redis1202-instance
name: redis1202
spec:
ports:
- port: 6379
protocol: TCP
targetPort: 6379
selector:
app: redis1202
type: NodePort
status:
loadBalancer: {}