Spring Boot微服务无法在Kubernetes上运行（java.net.SocketTimeoutException: connect timed out）答案

【问题标题】：Spring Boot Microservices cannot run on Kubernetes (java.net.SocketTimeoutException: connect timed out)Spring Boot微服务无法在Kubernetes上运行（java.net.SocketTimeoutException: connect timed out）
【发布时间】：2023-02-01 13:43:55
【问题描述】：

我在 Kubernetes 上运行 Spring Boot 微服务时遇到问题。安装 minikube 后，我启动它并打开它的仪表板。

这是打开仪表板的命令。

1 ) minikube start
2 ) minikube dashboard

接下来，我通过此命令运行所有服务。

kubectl apply -f k8s

等待一定时间后，我遇到了如下所示的问题。

15:22:37.395 [main] ERROR org.springframework.boot.SpringApplication - Application run failed
org.springframework.cloud.config.client.ConfigClientFailFastException: Could not locate PropertySource and the resource is not optional, failing
 at org.springframework.cloud.config.client.ConfigServerConfigDataLoader.doLoad(ConfigServerConfigDataLoader.java:197)
 at org.springframework.cloud.config.client.ConfigServerConfigDataLoader.load(ConfigServerConfigDataLoader.java:102)
 at org.springframework.cloud.config.client.ConfigServerConfigDataLoader.load(ConfigServerConfigDataLoader.java:61)
 at org.springframework.boot.context.config.ConfigDataLoaders.load(ConfigDataLoaders.java:107)
 at org.springframework.boot.context.config.ConfigDataImporter.load(ConfigDataImporter.java:128)
 at org.springframework.boot.context.config.ConfigDataImporter.resolveAndLoad(ConfigDataImporter.java:86)
 at org.springframework.boot.context.config.ConfigDataEnvironmentContributors.withProcessedImports(ConfigDataEnvironmentContributors.java:116)
 at org.springframework.boot.context.config.ConfigDataEnvironment.processWithProfiles(ConfigDataEnvironment.java:311)
 at org.springframework.boot.context.config.ConfigDataEnvironment.processAndApply(ConfigDataEnvironment.java:232)
 at org.springframework.boot.context.config.ConfigDataEnvironmentPostProcessor.postProcessEnvironment(ConfigDataEnvironmentPostProcessor.java:102)
 at org.springframework.boot.context.config.ConfigDataEnvironmentPostProcessor.postProcessEnvironment(ConfigDataEnvironmentPostProcessor.java:94)
 at org.springframework.boot.env.EnvironmentPostProcessorApplicationListener.onApplicationEnvironmentPreparedEvent(EnvironmentPostProcessorApplicationListener.java:102)
 at org.springframework.boot.env.EnvironmentPostProcessorApplicationListener.onApplicationEvent(EnvironmentPostProcessorApplicationListener.java:87)
 at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:176)
 at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:169)
 at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:143)
 at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:131)
 at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:85)
 at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:66)
 at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
 at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:120)
 at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:114)
 at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:65)
 at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:344)
 at org.springframework.boot.SpringApplication.run(SpringApplication.java:302)
 at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306)
 at org.springframework.boot.SpringApplication.run(SpringApplication.java:1295)
 at com.microservice.orderservice.OrderServiceApplication.main(OrderServiceApplication.java:15)
 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.base/java.lang.reflect.Method.invoke(Method.java:566)
 at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
 at org.springframework.boot.loader.Launcher.launch(Launcher.java:108)
 at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
 at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:65)
Caused by: org.springframework.web.client.ResourceAccessException: I/O error on GET request for "http://config-server-svc:9296/ORDER-SERVICE/default": connect timed out; nested exception is java.net.SocketTimeoutException: connect timed out
 at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:785)
 at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:711)
 at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:602)
 at org.springframework.cloud.config.client.ConfigServerConfigDataLoader.getRemoteEnvironment(ConfigServerConfigDataLoader.java:303)
 at org.springframework.cloud.config.client.ConfigServerConfigDataLoader.doLoad(ConfigServerConfigDataLoader.java:118)
 ... 35 common frames omitted
Caused by: java.net.SocketTimeoutException: connect timed out
 at java.base/java.net.PlainSocketImpl.socketConnect(Native Method)
 at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:412)
 at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:255)
 at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:237)
 at java.base/java.net.Socket.connect(Socket.java:609)
 at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:177)
 at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:508)
 at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:603)
 at java.base/sun.net.www.http.HttpClient.<init>(HttpClient.java:276)
 at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:375)
 at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:396)
 at java.base/sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1253)
 at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1187)
 at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1081)
 at java.base/sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:1015)
 at org.springframework.http.client.SimpleBufferingClientHttpRequest.executeInternal(SimpleBufferingClientHttpRequest.java:76)
 at org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal(AbstractBufferingClientHttpRequest.java:48)
 at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:66)
 at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:776)
 ... 39 common frames omitted

这是我的 deployment.yaml 文件，如下所示。

apiVersion: apps/v1
kind: Deployment
metadata:
  name: auth-service-app
spec:
  selector:
    matchLabels:
      app: auth-service-app
  template:
    metadata:
      labels:
        app: auth-service-app
    spec:
      containers:
        - name: auth-service-app
          image: noyandocker/authservice
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 7777
          env:
            - name: CONFIG_SERVER_URL
              valueFrom:
                configMapKeyRef:
                  name: config-cm
                  key: config_url
            - name: EUREKA_SERVER_ADDRESS
              valueFrom:
                configMapKeyRef:
                  name: eureka-cm
                  key: eureka_service_address
            - name: DB_HOST
              valueFrom:
                configMapKeyRef:
                  name: mysql-cm
                  key: hostname

---

apiVersion: v1
kind: Service
metadata:
  name: auth-service-svc
spec:
  selector:
    app: auth-service-app
  ports:
    - port: 80
      targetPort: 7777

这是下面显示的configmap yaml文件

apiVersion: v1
kind: ConfigMap
metadata:
  name: config-cm
data:
  config_url: "config-server-svc"

---

apiVersion: v1
kind: ConfigMap
metadata:
  name: eureka-cm
data:
  eureka_service_address: "http://eureka-0.eureka:8761/eureka"

---

apiVersion: v1
kind: ConfigMap
metadata:
  name: mysql-cm
data:
  hostname: "mysql-0.mysql"

这是下面显示的配置服务器yaml文件

apiVersion: apps/v1
kind: Deployment
metadata:
  name: config-server-app
spec:
  selector:
    matchLabels:
      app: config-server-app
  template:
    metadata:
      labels:
        app: config-server-app
    spec:
      containers:
        - name: config-server-app
          image: noyandocker/configserver
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 9296
          readinessProbe:
            httpGet:
              path: /actuator/health
              port: 9296
            initialDelaySeconds: 20
            timeoutSeconds: 10
            periodSeconds: 3
            failureThreshold: 10
          livenessProbe:
            httpGet:
              path: /actuator/health
              port: 9296
            initialDelaySeconds: 30
            timeoutSeconds: 2
            periodSeconds: 8
            failureThreshold: 10
          env:
            - name: EUREKA_SERVER_ADDRESS
              valueFrom:
                configMapKeyRef:
                  name: eureka-cm
                  key: eureka_service_address

---

apiVersion: v1
kind: Service
metadata:
  name: config-server-svc
spec:
  selector:
    app: config-server-app
  ports:
    - port: 80
      targetPort: 9296

我以为所有的服务都会同时启动。 Config Server 是所有其他服务（如 auth 服务）的依赖服务，在 Config Server 服务启动并运行之前，此 Auth 服务不应启动。

已编辑

我在 cloud_gateway_deployment.yaml 文件中添加了如下所示的代码 sn-ps，但它不起作用。

  initContainers:
    - name: init-configserver
      image: noyandocker/configserver
      command: [ 'sh', '-c', "until nslookup config-server-svc.$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace).svc.cluster.local; do echo waiting for config server; sleep 2; done" ]

我怎样才能做到这一点？

这是我的仓库：Link

这是我的码头工人中心：Link

这是 git 后端系统：Link

【问题讨论】：

标签： java spring-boot kubernetes yaml minikube

【解决方案1】：

如果您有依赖项需要等待其他服务，我建议实现一个 init 容器，这将允许您对 k8s 部署进行编程以等待某些依赖项存在或完成启动。我们已经为数据库做了类似的事情，因为我们在 k8s 中的许多 spring boot 服务都需要一个数据库才能启动。 https://kubernetes.io/docs/concepts/workloads/pods/init-containers/

此外，请确保您熟悉 k8s 网络路由的工作方式，以及使用其名称的其他 pod 的 DNS。 https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/

【讨论】：

我仍然无法解决问题。我还共享配置服务器和配置映射 yaml 文件。