Gepostet vor 2022-06-053 minutes lesen (Über 401 Wörter)

k8s 三种 Service

本文简单介绍 k8s 的三种 Service: ClusterIP、NodePort、LoadBalancer。

ClusterIP

ClusterIP 通过集群内部 IP 地址暴露服务，但该地址仅在集群内部可见，无法被集群外部的客户端访问。ClusterIP 是 Service 的默认类型，内部 IP 建议由 k8s 动态指定一个，也支持手动指定。示例：

apiVersion: v1
kind: Service
metadata:
  name: nginx-pod-service
spec:
  type: ClusterIP
  ports:
  - port: 8080
    targetPort: 80
  selector:
    app: nginx

创建 ClusterIP 后，查看内部 IP，并进行访问：

root@cloud:~# kubectl get svc -o wide
NAME                TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE    SELECTOR
kubernetes          ClusterIP   10.96.0.1      <none>        443/TCP    6d2h   <none>
nginx-pod-service   ClusterIP   10.100.23.74   <none>        8080/TCP   6s     app=nginx
root@cloud:~# curl 10.100.23.74:8080
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

NodePort

NodePort 是 ClusterIP 的增强类型，它在 ClusterIP 的基础之上，在每个节点上使用一个相同的端口号将外部流量引入到该 Service 上来。示例：

apiVersion: v1
kind: Service
metadata:
  name: nginx-pod-service
spec:
  type: NodePort
  ports:
  - port: 8080
    targetPort: 80
    nodePort: 30080
  selector:
    app: nginx

创建后，在集群外可以通过节点IP:30080访问该服务。

LoadBalancer

LoadBalancer 是 NodePort 的增强类型，为节点上的 NodePort 提供一个外部负载均衡器，需要公有云支持。示例：

apiVersion: v1
kind: Service
metadata:
  name: nginx-pod-service
spec:
  type: LoadBalancer
  ports:
  - port: 8080
    targetPort: 80
    nodePort: 30080
  loadBalancerIP: 1.2.3.4
  selector:
    app: nginx

创建后，在集群外可以通过1.2.3.4:30080访问该服务。

k8s 三种 Service

https://hey-kong.github.io/2022/06/05/k8s-三种-Service/

Author

王亮

Posted on

2022-06-05

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k8s 三种 Service

ClusterIP

NodePort

LoadBalancer

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