Spring Cloud Kubernetes ConfigMap 重新加载不工作

Question

我在 Minikube 中玩 Kubernetes。我可以将 spring 引导示例应用程序部署到 Kubernetes 中。

我正在探索 Kubernetes configMap。我可以使用 spring 云启动器成功地运行 spring 引导应用程序并从配置映射中选择属性键。到这里我就成功了。

我目前面临的问题是重新加载configmap。

这是我的配置图：

ConfigMap.yaml

 apiVersion: v1
kind: ConfigMap
metadata:
  name: minikube-sample
  namespace: default
data:
  app.data.name: name
  application.yml: |-
    app:
      data:
        test: test

bootstrap.yaml

management:
    endpoint:
        health:
            enabled: true
        info:
            enabled: true
        restart:
            enabled: true
spring:
    application:
        name: minikube-sample
    cloud:
        kubernetes:
            config:
                enabled: true
                name: ${spring.application.name}
                namespace: default
            reload:
                enabled: true

家庭控制器：

package com.minikube.sample.rest.controller;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.minikube.sample.properties.PropertiesConfig;
import lombok.Getter;
import lombok.Setter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Lookup;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author Gorantla, Eresh
 * @created 06-12-2018
 */
@RestController
@RequestMapping("/home")
public class HomeResource {

    @Autowired
    PropertiesConfig config;

    @GetMapping("/data")
    public ResponseEntity<ResponseData> getData() {
        ResponseData responseData = new ResponseData();
        responseData.setId(1);
        responseData.setName(config.getName());
        responseData.setPlace("Hyderabad");
        responseData.setValue(config.getTest());
        return new ResponseEntity<>(responseData, HttpStatus.OK);
    }

    @Getter
    @Setter
    public class ResponseData {
        private String name;
        private Integer id;
        private String place;
        private String value;
    }
}

deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: minikube-sample
  namespace: default
spec:
  selector:
      matchLabels:
        app: minikube-sample

  replicas: 1
  template:
    metadata:
      labels:
        app: minikube-sample
    spec:
      containers:
        - name: minikube-sample
          image: minikube-sample:latest
          imagePullPolicy: Never
          ports:
            - containerPort: 8080
          env:
            - name: env.namespace
              value: default
          volumeMounts:
            - name: config
              mountPath: /config
      volumes:
        - name: config
          configMap:
            name: minikube-sample

我使用@ConfigurationProperties 重新加载属性。

依赖关系

 <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-kubernetes</artifactId>
            <version>1.1.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-kubernetes-config</artifactId>
            <version>1.1.0.RELEASE</version>
        </dependency>

我做了什么？ 我已经阅读了 spring 云文档。 "The view role on the service account is required in order to listen for config map changes." 然后我通过以下命令创建了集群视图角色

C:\Users\eresh.gorantla\apps\minikube-sample\src\main\fabric8 (master -> origin)
λ kubectl create clusterrolebinding minikube-sample --clusterrole=view --serviceaccount=default:minikube --namespace=default
clusterrolebinding.rbac.authorization.k8s.io/minikube-sample created

但是当我在 kubernetes 中更新 configmap 时，属性不会即时重新加载。我怀疑 clusterrolebinding 有问题。请提供您的想法。任何帮助表示赞赏。

Answer 1

部署未配置 serviceAccountName，因此它使用 default 服务帐户。但是，问题中的命令 - kubectl create clusterrolebinding ... --serviceaccount=default:minikube... - 适用于 default 命名空间中名为 minikube 的帐户。

此外，创建 clusterrolebinding 可能是 "too much"，而 rolebinding 可以用于命名空间。

对于 default 命名空间 (metadata.namespace: default) 的部署，这应该创建一个适当的 rolebinding 以授予 default 帐户只读权限：

kubectl create rolebinding default-sa-view \
  --clusterrole=view \
  --serviceaccount=default:default \
  --namespace=default

有关参考，请参阅 Using RBAC Authorization。

Answer 2

感谢 gears 的回答。角色绑定足以在命名空间中使用角色视图，以便 configmap 在容器中可用。

我解决了更新依赖项的问题。 Spring 引导版本 2.1.8.Release 和 spring 版本可能 kubernetes 1.1.0.Release 不适合我。我怀疑添加了许多依赖项。我清理了 pom 文件并且效果很好。

Pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.minikube.sample</groupId>
    <artifactId>kubernetes-configmap-reload</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>minikube-sample</name>
    <description>Demo project for Spring Cloud Kubernetes</description>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-kubernetes-config</artifactId>
            <version>1.1.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.4</version>
            <scope>provided</scope>
        </dependency>


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

您可以在此处找到存储库 link -- https://github.com/ereshzealous/kubernetes-configmap-reload

谢谢埃雷什

Answer 3

要访问 ConfigMap 并获取刷新事件：

查看配置属性的注释class @Configuration(proxyBeanMethods = false) 另请参阅 @RefreshScope 配置属性 class。

@Configuration(proxyBeanMethods = false)
@ConfigurationProperties(prefix = "bean")
@RefreshScope
public class ClientConfig {

 private String message = "Default Message from java code - to be overwritten from config";

 public String getMessage() {...
 public void setMessage(String message) {...
}

2 添加访问 ConfigMaps 的权限

kubectl create -f perm.yaml -n <NAMESPACE>

其中 perm.yaml 是：

  kind: Role
  apiVersion: rbac.authorization.k8s.io/v1
  metadata:
    namespace: yldbg
    name: namespace-reader
  rules:
    - apiGroups: ["", "extensions", "apps"]
      resources: ["configmaps", "pods", "services", "endpoints", "secrets"]
      verbs: ["get", "list", "watch"]
  ---
  kind: RoleBinding
  apiVersion: rbac.authorization.k8s.io/v1
  metadata:
    name: namespace-reader-binding
    namespace: yldbg
  subjects:
  - kind: ServiceAccount
    name: default
    apiGroup: ""
  roleRef:
    kind: Role
    name: namespace-reader
    apiGroup: ""

创建权限后，部署pods和服务。

修改配置映射时，您将在 pod 日志中看到刷新事件

EventBasedConfigurationChangeDetector - Detected change in config maps
EventBasedConfigurationChangeDetector - Reloading using strategy: REFRESH
PropertySourceBootstrapConfiguration - Located property source: [BootstrapPropertySource {name='bootstrapProperties-configmap.client-svc.myns'}]
SpringApplication - The following profiles are active: kubernetes

由 yl

Spring Cloud Kubernetes ConfigMap 重新加载不工作

Spring Cloud Kubernetes ConfigMap reload not working

spring-boot

kubernetes

minikube

configmap

spring-cloud-kubernetes