Azure function HTTP Request 404 when published to Azure through Docker and Visual Studio - azure

Question

I'm attempting to learn some more about Azure Functions 2.0 and Docker containers to publish to my Azure instance. I followed to tutorial below with the only difference being that I published with docker to a container registry in azure using visual studio 2019.
https://learn.microsoft.com/en-us/azure/azure-functions/functions-create-your-first-function-visual-studio
This all worked correctly and I was able to start my container and visit the site. However, in the example you can visit /api/function1 and get a response. This works on my localhost but on the live site it returns a 404. It seems that /api/function1 is not reachable after being published.
The app itself returns this when visiting the IP itself so I know it is working. Do I need to do something else in Azure to expose my APIs?
My container log only shows this.
Hosting environment: Production
Content root path: C:\
Now listening on: http://[::]:80
Application started. Press Ctrl+C to shut down.
I grabbed my dockerfile from here
https://github.com/Azure/azure-functions-docker/blob/master/host/2.0/nanoserver-1809/Dockerfile
# escape=`
# Installer image
FROM mcr.microsoft.com/windows/servercore:1809 AS installer-env
SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"]
# Retrieve .NET Core SDK
ENV DOTNET_SDK_VERSION 2.2.402
RUN Invoke-WebRequest -OutFile dotnet.zip https://dotnetcli.blob.core.windows.net/dotnet/Sdk/$Env:DOTNET_SDK_VERSION/dotnet-sdk-$Env:DOTNET_SDK_VERSION-win-x64.zip; `
$dotnet_sha512 = '0fa3bf476b560c8fc70749df37a41580f5b97334b7a1f19d66e32096d055043f4d7ad2828f994306e0a24c62a3030358bcc4579d2d8d439d90f36fecfb2666f6'; `
if ((Get-FileHash dotnet.zip -Algorithm sha512).Hash -ne $dotnet_sha512) { `
Write-Host 'CHECKSUM VERIFICATION FAILED!'; `
exit 1; `
}; `
`
Expand-Archive dotnet.zip -DestinationPath dotnet; `
Remove-Item -Force dotnet.zip
ENV ASPNETCORE_URLS=http://+:80 `
DOTNET_RUNNING_IN_CONTAINER=true `
DOTNET_USE_POLLING_FILE_WATCHER=true `
NUGET_XMLDOC_MODE=skip `
PublishWithAspNetCoreTargetManifest=false `
HOST_COMMIT=69f124faed40d20d9d8e5b8d51f305d249b21512 `
BUILD_NUMBER=12858
RUN [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; `
Invoke-WebRequest -OutFile host.zip https://github.com/Azure/azure-functions-host/archive/$Env:HOST_COMMIT.zip; `
Expand-Archive host.zip .; `
cd azure-functions-host-$Env:HOST_COMMIT; `
/dotnet/dotnet publish /p:BuildNumber=$Env:BUILD_NUMBER /p:CommitHash=$Env:HOST_COMMIT src\WebJobs.Script.WebHost\WebJobs.Script.WebHost.csproj --output C:\runtime
# Runtime image
FROM mcr.microsoft.com/dotnet/core/aspnet:2.2.7-nanoserver-1809
COPY --from=installer-env ["C:\\runtime", "C:\\runtime"]
ENV AzureWebJobsScriptRoot=C:\approot `
WEBSITE_HOSTNAME=localhost:80
CMD ["dotnet", "C:\\runtime\\Microsoft.Azure.WebJobs.Script.WebHost.dll"]
Here's my function1 code for my azure function
public static class Function1
{
[FunctionName("Function1")]
public static async Task<IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
ILogger log)
{
log.LogInformation("C# HTTP trigger function processed a request.");
string productid = req.Query["productid"];
string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
dynamic data = JsonConvert.DeserializeObject(requestBody);
productid = productid ?? data?.product;
Product newProduct = new Product()
{
ProductNumber = 0,
ProductName = "Unknown",
ProductCost = 0
};
if (Convert.ToInt32(productid) ==1)
{
newProduct = new Product()
{
ProductCost = 100,
ProductName = "Lime Tree",
ProductNumber = 1
};
}
else if(Convert.ToInt32(productid) == 2)
{
newProduct = new Product()
{
ProductCost = 500,
ProductName = "Lemon Tree",
ProductNumber = 2
};
}
return productid != null
? (ActionResult)new JsonResult(newProduct)
: new BadRequestObjectResult("Please pass a name on the query string or in the request body");
}
Here's a photo of my container running with my image.
I'm new to this so any advice would be helpful for sure!
Thanks!

Answer 1

First, I don't know if you really need to (or want to) run Functions on Windows containers. If you want to run in a container, I would probably opt for Linux. For that, this is an example Dockerfile. It does build on top of the Microsoft-provided base image. So you don't have to build that from scratch.
I'm sure there is also a base image for Windows that is already build. If you need it, just look around in the similiar repo I guess.
FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build-env
WORKDIR /app
COPY . ./
RUN dotnet publish myfunction -c Release -o myfunction /out
FROM mcr.microsoft.com/azure-functions/dotnet:3.0 AS base
WORKDIR /app
EXPOSE 80
COPY --from=build-env /app/ao-backendfunctions/out .
ENV AzureWebJobsScriptRoot=/app
ENV AzureFunctionsJobHost__Logging__Console__IsEnabled=true
The important part is RUN dotnet publish myfunction -c Release -o myfunction /out. Replace myfunction with the (folder) name of your actual Function.

Answer 2

#silent's answer was correct - Linux containers are the way to go for Azure Functions. My environment wasn't set up correctly for Linux containers but once I got a correct environment this worked out of the box.
Here's my latest DockerFile for another project that uses Linux Containers
See https://aka.ms/containerfastmode to understand how Visual Studio uses this Dockerfile to build your images for faster debugging.
FROM mcr.microsoft.com/azure-functions/dotnet:2.0 AS base
WORKDIR /app
EXPOSE 80
FROM mcr.microsoft.com/dotnet/core/sdk:3.0 AS build
WORKDIR /src
COPY ["FunctionTestAppLinux/FunctionTestAppLinux.csproj", "FunctionTestAppLinux/"]
RUN dotnet restore "FunctionTestAppLinux/FunctionTestAppLinux.csproj"
COPY . .
WORKDIR "/src/FunctionTestAppLinux"
RUN dotnet build "FunctionTestAppLinux.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "FunctionTestAppLinux.csproj" -c Release -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENV AzureWebJobsScriptRoot=/app