感谢 Chis 的回答,我刚刚解决了这个问题这篇博文 https://habr.com/en/post/450904/.
事实证明,Heroku 确实想为您处理端口(可能是出于安全原因)。
使用样板 asp 核心模板,添加 docker 支持后,您可以开始:
程序.cs:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
namespace TestWebApp
{
public class Program
{
public static void Main(string[] args)
{
CreateHostBuilder(args).Build().Run();
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
});
}
}
Dockerfile:
#See https://aka.ms/containerfastmode to understand how Visual Studio uses this Dockerfile to build your images for faster debugging.
FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443
FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build
WORKDIR /src
COPY ["TestWebApp/TestWebApp.csproj", "TestWebApp/"]
RUN dotnet restore "TestWebApp/TestWebApp.csproj"
COPY . .
WORKDIR "/src/TestWebApp"
RUN dotnet build "TestWebApp.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "TestWebApp.csproj" -c Release -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "TestWebApp.dll"]
Heroku 希望您的应用程序在 Heroku 为您提供的端口上运行PORT
环境变量。它将为您公开 80 (HTTP) 和 443 (HTTPS) 端口。所以你要做的是:
从您的中删除这些行Dockerfile
:
EXPOSE 80
EXPOSE 443
然后您必须让您的应用程序侦听该端口。为了让它发挥作用,你必须改变你的Program.cs
file:
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureWebHostDefaults(webBuilder =>
{
var port = Environment.GetEnvironmentVariable("PORT");
webBuilder.UseStartup<Startup>()
.UseUrls("http://*:" + port);
});
然后 Heroku 发挥了魔力,您的应用程序仍然获得 HTTPS 支持。
Hint:
默认的 Dockerfile 无法在 Heroku CLI 中开箱即用。生成的 Dockerfile 应该从解决方案级别(而不是项目级别)运行。我无法强制 heroku CLI 使用 Dockerfile 形成嵌套目录。我让 id 工作的方式是:
- 去你的solution目录
- 创建 Dockerfile
- 粘贴修改内容:
#See https://aka.ms/containerfastmode to understand how Visual Studio uses this Dockerfile to build your images for faster debugging.
FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
WORKDIR /app
FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build
WORKDIR /src
COPY ["TestWebApp/TestWebApp.csproj", "TestWebApp/"]
RUN dotnet restore "TestWebApp/TestWebApp.csproj"
COPY ./TestWebApp ./TestWebApp
WORKDIR "/src/TestWebApp"
RUN dotnet build "TestWebApp.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "TestWebApp.csproj" -c Release -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "TestWebApp.dll"]
heroku login
heroku container:login
heroku container:push web --app your-app & heroku container:release web --app your-app