配置Hystrix Dashboard 时遇到的Unable to connect to Command Metric Stream.问题_dashboard unable to connect to command metric stre-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_43325510/article/details/121128897

本文介绍了在Spring Cloud中配置Hystrix Dashboard时遇到的问题及解决办法，包括配置Hystrix Metrics Stream Servlet和设置允许的代理主机名。

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在springCloud配置Hystrix Dashboard的时候我出现了Unable to connect to Command Metric Stream.问题。

查看报错发现如下信息

2021-11-01 13:39:43.859  WARN 17012 --- [nio-9001-exec-8] ashboardConfiguration$ProxyStreamServlet : Failed opening connection to http://localhost:8001/hystrix.stream : 404 : HTTP/1.1 404 
2021-11-01 13:39:43.896  INFO 17012 --- [nio-9001-exec-4] ashboardConfiguration$ProxyStreamServlet : 

Proxy opening connection to: http://localhost:8001/hystrix.stream

查找研究后发现原来是springcloud升级后的坑，ServletRegistrationBean因为springBoot的默认路径不是"/hystrix.stream"，所以直接打开http://localhost:8001/hystrix.stream也是报错的

那么只要在自己的项目里配置这个servlet就可以了，代码如下，放在SpringBoot的启动类上

@Bean
public ServletRegistrationBean getServlet() {
    HystrixMetricsStreamServlet streamServlet = new HystrixMetricsStreamServlet();
    ServletRegistrationBean registrationBean = new ServletRegistrationBean(streamServlet);
    registrationBean.setLoadOnStartup(1);
    registrationBean.addUrlMappings("/hystrix.stream");
    registrationBean.setName("HystrixMetricsStreamServlet");
    return registrationBean;
}

配置之后再次尝试直接打开http://localhost:8001/hystrix.stream ，果然正确的访问到了数据

然而我再次尝试打开Hystrix Dashboard的时候我又出现了Unable to connect to Command Metric Stream.

再次查看报错信息

2021-11-01 13:52:31.705  WARN 16816 --- [nio-9001-exec-1] ashboardConfiguration$ProxyStreamServlet : Origin parameter: http://localhost:8001/hystrix.stream is not in the allowed list of proxy host names.  If it should be allowed add it to hystrix.dashboard.proxyStreamAllowList.
2021-11-01 13:52:31.705  WARN 16816 --- [io-9001-exec-10] ashboardConfiguration$ProxyStreamServlet : Origin parameter: http://localhost:8001/hystrix.stream is not in the allowed list of proxy host names.  If it should be allowed add it to hystrix.dashboard.proxyStreamAllowList.

这次很清晰，就是说http://localhost:8001/hystrix.stream 不在允许的代理主机列表中，最后甚至给了我们解决方案

If it should be allowed add it to hystrix.dashboard.proxyStreamAllowList.

既然如此，我们就加吧，在dashboard的工程yml文件下加入如下配置即可

hystrix:
  dashboard:
    proxy-stream-allow-list: "localhost"

再次尝试，成功！

作者(Author)：魔王Dany
链接(URL)：https://mowangblog.top/mowang/hystrix-dashboard
来源(Source)：魔王の博客