【Azure 应用服务】更便捷的方式抓取Azure App Service for Windows的网络包

【Azure 应用服务】更便捷的方式抓取Azure App Service for Windows的网络包

问题描述

在之前的一篇博文中，介绍了在App Service中抓取网络日志：

抓取Windows的网络包：​​【应用服务 App Service】App Service中抓取网络日志​​抓取Linux的网络包：​​【Azure 应用服务】App Service For Linux 如何在 Web 应用实例上住抓取网络日志​​

现在，随着App Service的更新，Linnx也可以直接登录到SSH而不在需要复杂的配置操作。同时Windows环境中，也不在需要在本地安装 armclient.exe工具，而是直接通过 App Service的门户完成抓取，-操作。

操作步骤

第二步：选择 Collect Network Trace , 并设定抓取日志的时间长度， 60秒 ~ 15分钟的值供选择。页面中也对抓取网络日志的情况进行了说明：

Collect a Network Trace

If your app is facing issues while connecting to a remote server, you can use this tool to collect a network trace on the instance(s) serving the Web App.

Analyzing network traces is complex and time consuming task. Before collecting a network trace, please make sure you understand that you really need to collect a network trace to troubleshoot the problem.

What you should know before collecting a Network Trace

网络日志帮助定位TCP丢包，检查App Service与其他服务之间的HTTP通信情况（Network traces are helpful to troubleshoot TCP packet loss and to check HTTP communication that your App is making with the remote endpoints.）在开始抓取网络日志后，要在App Service上重新我们需要抓包解决的问题（After the network trace is started, you should reproduce the problem so that outbound traffic from your App gets captured in the trace.)如果适用HTTPS，那么数据将被加密(If the remote endpoints are called over TLS or SSL (i.e. HTTPS), then the traffic in the trace will be encrypted.）将会收集应用所在的全部实例上的网络包（Network traces are collected on all the instance(s) serving your App.)抓取网络日志只包含当前正在运行进程。当抓取网络包开始后，新的进程的网络包将不被抓取(Traces are captured only of processes that are running when the trace is started. The trace does not capture packets of any processes that start after the capture is started.)可以适用Network Monitor和Wireshark工具对网络包进行分析（To analyze the Network Trace, you need tools like​​Network Monitor ​​​or​​Wireshark​​ that can open the network captures.）

PS：此处不需要在登录到Kudu站点中，到 c:\home\logfiles\networktrace 目录中进行-，但是如果要查看历史的网络抓包文件，还是需要到Kudu站点中-。

注意：当前App Service For Linux环境，还是不支持以上方式抓包。 需要SSH，然后执行以下命令：

tcpdump -i any host and tcp port 443 -n -v -s 0

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当在复杂的环境中面临问题，格物之道需：浊而静之徐清，安以动之徐生。 云中，恰是如此!

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