Spring boot admin：客户端无法通过 https 向管理服务器注册

如何解决Spring boot admin：客户端无法通过 https 向管理服务器注册

我有一些 spring-boot 微服务向 spring-boot-admin (SBA) 注册。当我在本地运行微服务和 SBA 服务器时，客户端能够通过 HTTP 向 SBA 服务器注册自己。

当我将应用程序部署到 Kubernetes 集群时，向 SBA 注册是通过 HTTPS（通过 Ingress）完成的，我在日志中得到一个 javax.net.ssl.SSLHandshakeException

d.c.b.a.c.r.ApplicationRegistrator : Failed to register application as Application(name=my-app,managementUrl=https://my-app-dev.mydomain.com/actuator,healthUrl=https://my-app-dev.mydomain.com/actuator/health,serviceUrl=https://my-app-dev.mydomain.com) at spring-boot-admin ([https://my-admin-dev.mydomain.com/instances]): I/O error on POST request for "https://my-admin-dev.mydomain.com/instances": Received fatal alert: protocol_version; nested exception is javax.net.ssl.SSLHandshakeException: Received fatal alert: protocol_version. Further attempts are logged on DEBUG level

在微服务（SBA 客户端）中，我使用以下依赖项

<dependency>
  <groupId>de.codecentric</groupId>
  <artifactId>spring-boot-admin-starter-client</artifactId>
  <version>2.4.0</version>
</dependency>

application.yaml 中的以下内容

spring.boot.admin.client:
  url: "https://my-admin-dev.mydomain.com"
  instance.service-url: "https://my-app-dev.mydomain.com"

解决方法

我能够查看 spring-boot-admin-starter-client 代码。首先，我从日志消息中的 ApplicationRegistrator 开始，这导致我找到了一个可覆盖的 BlockingRegistrationClient 实例（是的！）

public class SpringBootAdminClientAutoConfiguration {
    ...
    @Configuration(proxyBeanMethods = false)
    @ConditionalOnBean(RestTemplateBuilder.class)
    public static class BlockingRegistrationClientConfig {
        @Bean
        @ConditionalOnMissingBean
        public BlockingRegistrationClient registrationClient(ClientProperties client) {
            RestTemplateBuilder builder = new RestTemplateBuilder().setConnectTimeout(client.getConnectTimeout())
                    .setReadTimeout(client.getReadTimeout());
            if (client.getUsername() != null && client.getPassword() != null) {
                builder = builder.basicAuthentication(client.getUsername(),client.getPassword());
            }
            return new BlockingRegistrationClient(builder.build());
        }
    }   

使用 this post 作为指导，我能够创建一个 RestTemplate，并将信任存储加载到 SSLContext 中。然后，我可以使用自己的包装自定义 BlockingRegistrationClient 的实例覆盖 RestTemplate 实例。

@Bean
public BlockingRegistrationClient registrationClient(
        @Value("${ssl.protocol}") String protocol,@Value("${ssl.trustStore.path}") String trustStorePath,@Value("${ssl.trustStore.password}") String trustStorePassword,ClientProperties client) throws Exception {

    SSLContext sslContext = SSLContextBuilder.create()
            .loadTrustMaterial(new File(trustStorePath),trustStorePassword.toCharArray())
            .setProtocol(protocol)
            .build();

    CloseableHttpClient httpClient = HttpClientBuilder.create()
            .setSSLContext(sslContext)
            .build();

    RestTemplateBuilder builder = new RestTemplateBuilder()
            .setConnectTimeout(client.getConnectTimeout())
            .setReadTimeout(client.getReadTimeout())
            .requestFactory(() -> new HttpComponentsClientHttpRequestFactory(httpClient));

    if (client.getUsername() != null && client.getPassword() != null) {
        builder = builder.basicAuthentication(client.getUsername(),client.getPassword());
    }
    return new BlockingRegistrationClient(builder.build());
}

application.yaml

ssl:
  protocol: TLSv1.2
  trustStore:
    path: "/opt/java/openjdk/lib/security/cacerts"
    password: "*****"