将docker环境变量传递到.net核心 [英] passing docker environment variables to .net core

问题描述

我已遵循以下文章和 github 上的代码不执行不编译，我认为教程已经过时了.( Configuration = builder.Build(); )引发错误.那么如何访问从docker传递的env?

I've followed this article and the code on the github doesn't compile, tutorial is outdated I think. (Configuration = builder.Build();) throws error. So how can I access env passed from docker?

docker-compose

  myproj:
    image: mcr.microsoft.com/dotnet/core/sdk:2.2
    restart: on-failure
    working_dir: /MyProj
    command: bash -c "dotnet build MyProj.csproj && dotnet bin/Debug/netcoreapp2.2/MyProj.dll"
    ports:
      - 5001:5001
      - 5000:5000
    volumes:
      - "./MyProj:/MyProj"
    environment:
      DATABASE_HOST: database
      DATABASE_PASSWORD: Password

---

Startup.cs

public Service()
{
    Environment.GetEnvironmentVariable("DATABASE_PASSWORD"); // null
}

// This method gets called by the runtime. Use this method to add services to the container.
// For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
public void ConfigureServices(IServiceCollection services)
{
}

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }

    app.Run(async (context) =>
    {
        context.Response.WriteAsync("Hello World!");
    });
}

推荐答案

您可以在build参数中传递env变量.例如.

You can pass env variable in build argument. E.g.

-build-arg ASPNETCORE_ENVIRONMENT =开发

--build-arg ASPNETCORE_ENVIRONMENT=Development

使用下面的变量来设置值:

Use below variable to set value:

ASPNETCORE_ENVIRONMENT

ASPNETCORE_ENVIRONMENT

代码:

var environmentName = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");

var environmentName = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");

您可以在代码中使用上述变量作为环境名称.

You can use above variable in your code for environment name .

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