我有一个 Spring Boot Web 应用程序,它只是打印在 Kubernetes 的 ConfigMap 中传递的属性。
这是我的主要类(class):
@SpringBootApplication
@EnableDiscoveryClient
@RestController
public class DemoApplication {
private MyConfig config;
private DiscoveryClient discoveryClient;
@Autowired
public DemoApplication(MyConfig config, DiscoveryClient discoveryClient) {
this.config = config;
this.discoveryClient = discoveryClient;
}
@RequestMapping("/")
public String info() {
return config.getMessage();
}
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
@RequestMapping("/services")
public String services() {
StringBuilder b = new StringBuilder();
discoveryClient.getServices().forEach((s) -> b.append(s).append(" , "));
return b.toString();
}
}
和
MyConfig
类是:@Configuration
@ConfigurationProperties(prefix = "bean")
public class MyConfig {
private String message = "a message that can be changed live";
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
}
基本上,通过调用根资源,我总是得到:
a message that can be changed live
调用/services 我实际上得到了一个 Kubernetes 服务列表。
我正在使用
kubectl create -f configmap-demo.yml
创建 ConfigMap是内容:apiVersion: v1
kind: ConfigMap
metadata:
name: demo
data:
bean.message: This is an info from k8
和部署
kubecetl create -f deploy-demo.yml
内容是:apiVersion: apps/v1
kind: Deployment
metadata:
name: demo
labels:
app: demo
spec:
replicas: 1
selector:
matchLabels:
app: demo
template:
metadata:
labels:
app: demo
spec:
# this service account was created according to
# https://kubernetes.io/docs/reference/access-authn-authz/rbac/#service-account-permissions
# point 5 - Grant super-user access to all service accounts cluster-wide (strongly discouraged)
serviceAccountName: i18n-spring-k8
containers:
- name: demo
image: aribeiro/sck-demo
imagePullPolicy: Never
env:
- name: JAVA_OPTS
value:
ports:
- containerPort: 8080
volumes:
- name: demo
configMap:
name: demo
问题是访问root资源时
/
我总是得到默认的硬编码值,而不是 Kubernetes 的 ConfigMap 中定义的值。示例项目还带有 yaml 文件和 Docker 文件,可在 https://drive.google.com/open?id=107IcwnYIbVpmwVgdgi8Dhx4nHEFAVxV8 获得.
还检查了启动调试日志,我没有看到任何错误或线索为什么它不应该工作。
最佳答案
Spring Cloud Kubernetes documentation不完整。它缺少包含此依赖项以启用从 ConfigMap 加载应用程序属性的指令:
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-kubernetes-config</artifactId>
</dependency>
关于Spring Cloud Kubernetes - Spring boot 不读取配置映射,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53960467/