我创建了默认的blazor服务器端应用程序。然后添加Microsoft.AspNetCore.SignalR.Client
和ChatHub
类。然后编辑了startup.cs文件(添加services.AddSignalR()
和endpoints.MapHub<ChatHub>("/chatHub")
)和index.razor
页面。然后通过IIS Express运行。这很不错。
然后添加了docker支持并运行Docker主机。它不起作用。因为仅不工作集线器连接StartAsync方法。怎么运行呢?帮我? 非常感谢你们。
错误是:
处理请求时发生未处理的异常。 SocketException:无法分配请求的地址 System.Net.Http.ConnectHelper.ConnectAsync(字符串主机,int端口,CancelationToken cancelToken)
HttpRequestException:无法分配请求的地址 System.Net.Http.ConnectHelper.ConnectAsync(字符串主机,int端口,CancelationToken cancelToken)
index.razor代码:
@code {
private HubConnection _hubConnection;
protected override async Task OnInitializedAsync()
{
_hubConnection = new HubConnectionBuilder()
.WithUrl(NavigationManager.ToAbsoluteUri("/chatHub"))
.Build();
_hubConnection.On<string, string>("ReceiveMessage", (user, message) =>
{
var encodedMsg = $"{user}: {message}";
StateHasChanged();
});
await _hubConnection.StartAsync(); // **DON'T WORK IN DOCKER HOST.**
}
}
Docker文件:
FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
WORKDIR /app
EXPOSE 80
FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build
WORKDIR /src
COPY ["BlazorApp1/BlazorApp1.csproj", "BlazorApp1/"]
RUN dotnet restore "BlazorApp1/BlazorApp1.csproj"
COPY . .
WORKDIR "/src/BlazorApp1"
RUN dotnet build "BlazorApp1.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "BlazorApp1.csproj" -c Release -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "BlazorApp1.dll"]
答案 0 :(得分:2)
我最好的猜测是您的中心客户端正在尝试连接到“ the-public-url-out-of-docker / chatHub”:
_hubConnection = new HubConnectionBuilder() .WithUrl(NavigationManager.ToAbsoluteUri("/chatHub")) .Build();
NavigationManager.ToAbsoluteUri(...)
会将/chatHub
转换为公开的URL,公开给最终用户。例如,如果您使用反向代理,则可能是域名。
请注意,网址分为三个不同的级别:
+----------------------------------+
| HOST (5000) |
| + |
| |Port Mapping---------------+ |
| >-->-->|Container (80) | |
| | | |
| +--------------------+ |
+-----^----------------------------+
| reverse proxy
+-------+----------------------------+
| nginx |
| https://www.myexample.com/chatHub
| |
+-------^----------------------------+
|
|
|
|
+-------+-----------+
| |
| Browser | (Brazor sees only the public url via NavgiationManager )
| |
+-------------------+
但是,在docker中运行时,无法始终从容器的网络访问主机的网络。
如果是这样,有几种方法应该可行:
.WithUrl(NavigationManager.ToAbsoluteUri("/chatHub"))
之类的公共网址。将其硬编码到容器ip&port。例如,如果您的容器监听80,则应为http://localhost/chatHub
。--network
。有关更多详细信息,请参见this thread