问题描述
App Service上可以收.NET 应用的Profile Trace文件,并且可以自动分析报告。
Collect a Profiler Trace
If your app is down or performing slow, you can collect a profiling trace to identify the root cause of the issue. Profiling is light weight and is designed for production scenarios.
What you should know before collecting a Profiler trace
Once the profiler trace is started, reproduce the issue by browsing to the web app.
The profiler trace will automatically stop after 60 seconds.
If thread report option is enabled, then raw stack traces of threads inside the process will be collected as well.
With thread report option, your App may be paused for a few seconds till all the threads are dumped.
Your web app will not be restarted as a result of running the profiler.
A profiler trace will help to identify issues in an ASP.NET or ASP.NET Core application.
只是,查看的报告中,所以数据均无法显示,如下图:
如何来解决这个问题呢?
问题解答
在报告页面中打开“开发者模式”,查看Console日志或者是Networks日志,发现问题是因为 js /css 文件无法访问导致。
GET https://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js net::ERR_CONNECTION_TIMED_OUT
因为中国区Azure所部署的位置位于北京,上海区域。所以无法正常访问 Google API,无法直接获取 angular.min.js 资源。所以可以通过修改html的 js应用路径来解决问题。
第一步:找到一个在中国区Azure可以访问的 1.2.15 版本的 angular.min.js
可以使用 https://cdn.bootcdn.net/ajax/libs/angular.js/1.2.15/angular.min.js 替换 https://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js
第二步:打开App Service的Kudu站点,进入DebugConsole
寻找 Data/DaaS/Reports/240701_1119225346/240701_1121184125/dw0sdwk00002D/index.html 文件, 然后编辑。 注意 “/240701_1119225346/240701_1121184125/dw0sdwk00002D/” 这部分内容会根据具体的时间,实例名发生变动。
第三步:在HTML文件种替换 angular.min.js
## 把
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js"></script>
## 替换为
<script src="https://cdn.bootcdn.net/ajax/libs/angular.js/1.2.15/angular.min.js"></script>
再次打开 Profiler Report 页面,加载数据成功!
参考资料
Angular JS: https://www.bootcdn.cn/angular.js/
Collect .NET Profiler Trace : https://appserviceblog.com/en/collect-net-profiler-trace/
App Service Diagnostics – Profiling an ASP.NET Web App on Azure App Service : https://azure.github.io/AppService/2018/06/06/App-Service-Diagnostics-Profiling-an-ASP.NET-Web-App-on-Azure-App-Service.html
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