配置deploy的时候可以配置网络为宿主机网络

    1. spec:
    2.   containers:
    3.   - image: nginx:1.14.2
    4.     imagePullPolicy: IfNotPresent
    5.     name: nginx
    6.     ports:
    7.     - containerPort: 80
    8.       hostPort: 80
    9.       protocol: TCP
    10.     resources: {}
    11.     terminationMessagePath: /dev/termination-log
    12.     terminationMessagePolicy: File
    13.     volumeMounts:
    14.     - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
    15.       name: kube-api-access-9dwn2
    16.       readOnly: true
    17.   dnsPolicy: ClusterFirst
    18.   enableServiceLinks: true
    19.   hostNetwork: true
    20.   preemptionPolicy: PreemptLowerPriority
    21.   priority: 0
    22.   restartPolicy: Always
    23.   schedulerName: default-scheduler
    24.   securityContext: {}
    25.   serviceAccount: default
    26.   serviceAccountName: default
    27.   terminationGracePeriodSeconds: 30

    配置后hostname，ip和宿主机相同
    包括 /etc/resolv.conf

    dnspolicy改为 ClusterFirstHostNet 后 /etc/resolv.conf 指向宿主机的 nodelocaldns