无法读取名称为：[xx] in namespace ['default'] 忽略的配置映射

Question

k8s 的新手。

尝试从基于配置文件的配置映射中读取值。我的 configmap 存在于默认命名空间中。但是，spring boot 并没有获取这些值。

配置图如下所示：

apiVersion: v1
kind: ConfigMap
metadata:
    name: example-configmap-overriding-new-01
data:
    application.properties: |-
        globalkey = global key value
    application-qa.properties: |-
        globalkey = global key qa value    
    application-prod.properties: |-
        globalkey = global key prod value

配置映射也是在默认命名空间中创建的。

kubectl get configmap -n default 

NAME                                  DATA   AGE
example-configmap-overriding-new-01   3      8d

我的部署文件看起来像

apiVersion: apps/v1
kind: Deployment
metadata: 
    name: demo-configmapk8testing
spec:  
    selector:
        matchLabels:
            app: demo-configmapk8testing
replicas: 1
template: 
    metadata:
        labels:
            app: demo-configmapk8testing        
    spec:
        containers:
          - name: demo-configmapk8testing
            image: Path to image
            ports:
            - containerPort: 8080
            args: [
            "--spring.profiles.active=prod",
            "--spring.application.name=example-configmap-overriding-new-01",
            "--spring.cloud.kubernetes.config.name=example-configmap-
            overriding-new-01",
            "--spring.cloud.kubernetes.config.namespace=default",
            "--spring.cloud.kubernetes.config.enabled=true"]
            envFrom:
            - configMapRef:
                name: example-configmap-overriding-new-01

但是弹簧引导日志说：-

2019-07-02 22:10:38.092  WARN 1 --- [           main] 
o.s.c.k.config.ConfigMapPropertySource   : Can't read configMap with name: 
[example-configmap-overriding-new-01] in namespace:[default]. Ignoring

2019-07-02 22:10:38.331  INFO 1 --- [           main] 
b.c.PropertySourceBootstrapConfiguration : Located property source: 
CompositePropertySource {name='composite-configmap', propertySources= 
[ConfigMapPropertySource {name='configmap.example-configmap-overriding-new- 
01.default'}]}

2019-07-02 22:10:38.420  INFO 1 --- [           main] 
b.c.PropertySourceBootstrapConfiguration : Located property source: 
SecretsPropertySource {name='secrets.example-configmap-overriding-new- 
01.default'}

2019-07-02 22:10:38.692  INFO 1 --- [           main] 
c.e.c.ConfigconsumerApplication          : **The following profiles are 
active: prod**

--some logs--

Injection of autowired dependencies failed; nested exception is 
java.lang.IllegalArgumentException: **Could not resolve placeholder 
'globalkey' in value "${globalkey}"**

我的 spring boot 配置文件看起来像

@Configuration
public class ConfigConsumerConfig {

    @Value(value = "${globalkey}")
    private String globalkey;

    // with getter and setters 
}

我的 pom.xml 也有以下依赖项。

    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-kubernetes-config</artifactId>
        <version>1.0.2.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-configuration-processor</artifactId>
        <optional>true</optional>
    </dependency>

我在本地机器上运行 minikube。我在这里错过了什么吗？

有人可以在这里分享一些投入。

Answer 1

spring-cloud-kubernetes无权访问 Kubernetes API，因此无法读取 configMap。查看此文档以获取更多详细信息：https : //github.com/spring-cloud/spring-cloud-kubernetes/blob/master/docs/src/main/asciidoc/security-service-accounts.adoc。

简而言之，应用此配置，它将正常工作：

kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: YOUR-NAME-SPACE
  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: YOUR-NAME-SPACE
subjects:
- kind: ServiceAccount
  name: default
  apiGroup: ""
roleRef:
  kind: Role
  name: namespace-reader
  apiGroup: ""

您可以在此处更详细地了解角色和角色绑定：https ://kubernetes.io/docs/reference/access-authn-authz/rbac/ 。

注意：您不必创建卷和卷挂载。我会说它是它的替代品。如果您想以这种方式使用它，则必须spring.cloud.kubernetes.config.paths在 spring boot 应用程序配置中指定（我已将其写入bootstrap.yaml资源文件）。例如

spring: 
  cloud:
    kubernetes:
      config:
        paths: /etc/config/application.yaml

然后通过 Kubernetes 部署配置创建 ConfigMap 卷并将其挂载到该路径上。在我们的示例中，路径是/etc/config。

请让我知道这对你有没有用 ：）

Answer 2

您能否尝试挂载您的配置映射，也许可以提供帮助

volumeMounts:
- mountPath: /app/config
  name: example-configmap-overriding-new-01

volumes:
- name: example-configmap-overriding-new-01
  configMap:
      name: example-configmap-overriding-new-01

如果有效请告诉我。谢谢

更正了语法错误