教程：官方文档https://docs.microsoft.com/zh-cn/dotnet/core/diagnostics/debug-memory-leak
环境：Linux、Docker、.NET Core 3.1 SDK及更高版本
示例代码：samples/core/diagnostics/DiagnosticScenarios at main · dotnet/samples · GitHub
 

一 运行官方示例

示例中包含了泄漏内存、死锁线程、CPU占用过高等接口，方便学习。
 

1,Clone代码并编译

[root@localhost ~]# cd Diagnostic_scenarios_sample_debug_target
[root@localhost Diagnostic_scenarios_sample_debug_target]# dotnet build -c Release
Microsoft (R) Build Engine version 16.7.0+7fb82e5b2 for .NET
...
Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:05.62

2,创建Dockerfile构建镜像

FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
WORKDIR /app
EXPOSE 80

COPY  bin/Release/netcoreapp3.1 .

ENTRYPOINT ["dotnet", "DiagnosticScenarios.dll"]

[root@localhost Diagnostic_scenarios_sample_debug_target]# vim Dockerfile
[root@localhost Diagnostic_scenarios_sample_debug_target]# docker build -t dumptest .
Sending build context to Docker daemon   1.47MB
Step 1/5 : FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
...
Successfully built 928e512d9be4
Successfully tagged dumptest:latest
[root@localhost Diagnostic_scenarios_sample_debug_target]# docker images
REPOSITORY                                                              TAG                   IMAGE ID            CREATED             SIZE
dumptest                                                                latest                928e512d9be4        5 seconds ago       267MB

3,启动容器

--privileged=true参数的作用是给容器赋予root权限，后面createdump需要该支持。

[root@localhost Diagnostic_scenarios_sample_debug_target]# docker run --name diagnostic --privileged=true -p 888:80 -d dumptest
a68efbfbfb13117142bac9b0c6fb9f4c5124e4490eaf4850dd17fdc612e2cfda
[root@localhost Diagnostic_scenarios_sample_debug_target]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                  NAMES
a68efbfbfb13        dumptest            "dotnet DiagnosticSc…"   24 seconds ago      Up 23 seconds       0.0.0.0:888->80/tcp   diagnostic

看看能否访问成功 http://192.168.0.161:888/api/values

​

 

二 生成dump转储文件

很多时候问题出现在生产环境，而测试环境又很难重现，所以问题出现时优先生成一个dump文件，然后去恢复服务(重启解决大部分问题啊