Use the host network - Container Service for Kubernetes - Alibaba Cloud Documentation Center

If a pod runs in the host network of the node where the pod is deployed, the pod can use the network namespace and network resources of the node. In this scenario, the pod can access loopback devices on the node, listen for requests sent to specific addresses, and monitor the traffic of other pods. This topic describes how to use the host network.

Prerequisites

A Container Service for Kubernetes (ACK) cluster is created. For more information, see Create an ACK Pro cluster.
A kubectl client is connected to the cluster. For more information, see Obtain the kubeconfig file of a cluster and use kubectl to connect to the cluster.

Procedure

Open the YAML file named host-network.yaml. If you cannot find the file in the current environment, create one. Add hostNetwork: true to the spec section.
The following sample code shows the content of the YAML file:
```
apiVersion: v1
kind: Pod
metadata:
  name: nginx
spec:
  hostNetwork: true
  containers:
  - name: nginx
    image: nginx
```
Run the following command to create a pod:
```
kubectl apply -f host-network.yaml
```
Run the following command to check whether the pod uses the host network of the node:
```
kubectl get pod -o wide
```
The output indicates that the IP address of the pod is the same as that of the node. This means that the pod runs in the host network of the node.
```
NAME    READY   STATUS    RESTARTS   AGE   IP              NODE                           NOMINATED NODE
nginx   1/1     Running   0          29s   192.168.XX.XX   cn-zhangjiakou.192.168.XX.XX   <none>
```