[英]Connect Refused Kubernetes Service Discovery Using Spring Boot
我正在嘗試使用 spring-boot-kubernetes 設置一個簡單的發現,但是每次嘗試通過服務名稱超出服務時都會拒絕連接。
我已經包括:
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-kubernetes</artifactId>
</dependency>
並添加了@EnableDiscoveryClient 注解。
下面是我試圖通過名稱從其他服務調用的服務的 deployment.yml。
kind: Service
apiVersion: v1
metadata:
name: sample-rest
spec:
selector:
app: sample-rest
ports:
- protocol: TCP
port: 8771
targetPort: 8771
type: NodePort
---
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app.kubernetes.io/name: sample-rest
name: sample-rest
spec:
replicas: 1
selector:
matchLabels:
app.kubernetes.io/name: sample-rest
template:
metadata:
labels:
app.kubernetes.io/name: sample-rest
spec:
containers:
- name: sample-rest
image: kryptonian/sample-rest:1.0
ports:
- containerPort: 8771
下面是我試圖通過名稱調用上述服務的發現服務的 deployment.yml。
kind: Service
apiVersion: v1
metadata:
name: sample-discovery
spec:
selector:
app: sample-discovery
ports:
- protocol: TCP
port: 8772
targetPort: 8772
type: NodePort
---
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app.kubernetes.io/name: sample-discovery
name: sample-discovery
spec:
replicas: 1
selector:
matchLabels:
app.kubernetes.io/name: sample-discovery
template:
metadata:
labels:
app.kubernetes.io/name: sample-discovery
spec:
containers:
- name: sample-discovery
image: kryptonian/discovery-sample:1.0
ports:
- containerPort: 8772
調用服務的代碼:
@GetMapping("/test")
public String getHelloMessage() {
RestTemplate restTemplate = new RestTemplate();
String url = "http://sample-rest:8771/sample";
ResponseEntity<String> result = restTemplate.getForEntity(url, String.class);
return result.getBody();
}
每次我嘗試調用以下端點時,日志和 ui 上都會出現錯誤。
2020-04-13 16:08:04.187 ERROR 1 --- [nio-8772-exec-5] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.client.ResourceAccessException: I/O error on GET request for "http://sample-rest:8771/sample": Connection refused (Connection refused); nested exception is java.net.ConnectException: Connection refused (Connection refused)] with root cause
java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method) ~[na:1.8.0_212]
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_212]
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_212]
kubectl 描述 svc sample-rest 的 Output
Name: sample-rest
Namespace: default
Labels: <none>
Annotations: kubectl.kubernetes.io/last-applied-configuration:
{"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"name":"sample-rest","namespace":"default"},"spec":{"ports":[{"port":8771...
Selector: app=sample-rest
Type: NodePort
IP: 10.35.250.117
Port: <unset> 8771/TCP
TargetPort: 8771/TCP
NodePort: <unset> 31406/TCP
Endpoints: <none>
Session Affinity: None
External Traffic Policy: Cluster
Events: <none>
這里的問題是 service sample-rest
的 endpoints 是空的。您應該檢查您的 Service 的spec.selector
字段是否實際選擇了您 Pod 上的metadata.labels
值。 有app: sample-rest
as spec.selector
但 pod label 有app.kubernetes.io/name: sample-rest
不匹配。
如果這是服務問題,您也可以嘗試直接繞過服務連接到 POD IP 以隔離。
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