Create a ClusterIP Service in the ACS console-Container Compute Service(ACS)-阿里云帮助中心

In Kubernetes, pods are ephemeral and have IP addresses that can change. A Service provides a stable endpoint, such as a virtual IP address, to access a set of pods. This decouples frontend clients from backend pods, ensuring reliable communication even as pods are created or destroyed. This topic describes how to create a ClusterIP Service by using the Alibaba Cloud Container Service (ACS) console.

Background information

In Kubernetes, a Service is an abstraction that defines a logical set of pods and a policy to access them, often referred to as a microservice. The set of pods targeted by a Service is typically determined by a label selector.

In Kubernetes, pods have their own IP addresses but are ephemeral—they can be created and destroyed dynamically. Exposing pods directly to external traffic prevents you from achieving a high availability architecture. A Service decouples the frontend from the backend, which allows the frontend to operate without knowing the specific backend pods. This enables a loosely coupled microservice design.

For more information, see Kubernetes Service.

Step 1: Create a Deployment

Log on to the ACS console. In the left navigation pane, click Clusters.
On the Clusters page, click the name of the target cluster. In the left navigation pane, choose Workloads > Deployments.
On the Deployments page, click Create from YAML.

Select a template or enter your own YAML, then click Create.

This example template defines a Deployment for Nginx.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-nginx-svc
  namespace: default
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: registry.cn-hangzhou.aliyuncs.com/acs-sample/nginxdemos:latest
        ports:
        - containerPort: 80

On the Deployments page, click the name of the target application or Details in the Actions column. Monitor the status of the Deployment and wait for all its pod instances to become available.

Step 2: Create a Service

On the Clusters page, click the name of the target cluster. In the left navigation pane, choose Network > Services.

On the Services page, click Create. In the Create Service dialog box, configure the following parameters and click OK.

Parameter	Description	Example
Name	The name of the Service.	my-nginx-svc
Service Type	Select Cluster IP. This type exposes the Service on a cluster-internal IP address, making the Service reachable only from within the cluster. This is the default Service type. Note You can optionally enable Headless Service. This allows you to interface with other service discovery systems without being tied to the Kubernetes implementation.	ClusterIP
Backend	Select the backend application to which the Service routes traffic. If you do not associate a backend, the system does not create an Endpoints object. For more information, see Services without selectors.	Name: app Value: nginx
Port Mapping	Add a mapping between the Service Port, which corresponds to the `port` field in the Service YAML, and the Container Port, which corresponds to the `targetPort` field. The container port must match the port exposed by the backend pods.	Service Port: 80 Container Port: 80 Protocol: TCP
Annotations	Add an annotation to the Service.	None
Label	Add a label to identify the Service.	None

After the Service is created, it appears on the Services page. In the Actions column, click Update, Edit YAML, or Delete to manage it.