Run ASP.NET Core App Under Linux on Startup

run ASP.NET Core app under Linux on startup

This section in docs describes, how to create a service file to automatically start your Asp.Net Core app.

Create the service definition file:

sudo nano /etc/systemd/system/kestrel-hellomvc.service

The following is an example service file for the app:

[Unit]
Description=Example .NET Web API App running on Ubuntu

[Service]
WorkingDirectory=/var/aspnetcore/hellomvc
ExecStart=/usr/bin/dotnet /var/aspnetcore/hellomvc/hellomvc.dll
Restart=always
# Restart service after 10 seconds if the dotnet service crashes:
RestartSec=10
SyslogIdentifier=dotnet-example
User=www-data
Environment=ASPNETCORE_ENVIRONMENT=Development

[Install]
WantedBy=multi-user.target

Save the file and enable the service.

systemctl enable kestrel-hellomvc.service

Start the service and verify that it's running.

systemctl start kestrel-hellomvc.service
systemctl status kestrel-hellomvc.service

You need to set WorkingDirectory - path to folder with your app and ExecStart - with path to your app dll. By default this is enough.

From now, your app will automatically start on OS startup and will try to restart after crashes.

How to start asp.net core server on linux and keep it running

Basically what happens is:

1. You login with ssh
2. you startup an application under your user (dotnet run)
3. Close your ssh => logging out user, which means application is closed.

You need to start a service outside of your user. Here is some information:

• https://askubuntu.com/questions/8653/how-to-keep-processes-running-after-ending-ssh-session

Otherwise i'd advice you to ask on https://askubuntu.com/

Running a self-contained ASP.NET Core application on Ubuntu

Answer

Now, how do I run my application? My understanding is that because it is a self-contained .NET Core application I do not need to download and install .NET Core anything. My application should contain everything it needs.

You are correct. Run the executable.

When you create a self-contained app, the publish output "contains the complete set of files (both your app files and all .NET Core files) needed to launch your app." That includes the executable.

Example Self-Contained Deployment

Here is the output of dotnet publish -c release -r ubuntu.14.04-x64 for a simple self-contained application. Copy the publish directory to Ubuntu and run the executable.

C:\MyApp\bin\release\netcoreapp1.0\ubuntu.14.04-x64\publish\

...

libsos.so
libsosplugin.so
libuv.so
Microsoft.CodeAnalysis.CSharp.dll
Microsoft.CodeAnalysis.dll
Microsoft.CodeAnalysis.VisualBasic.dll
Microsoft.CSharp.dll
Microsoft.VisualBasic.dll
Microsoft.Win32.Primitives.dll
Microsoft.Win32.Registry.dll
mscorlib.dll
mscorlib.ni.dll
MyApp                        <------- On Ubuntu, run this executable
MyApp.deps.json                       and you will see Hello World!
MyApp.dll
MyApp.pdb
MyApp.runtimeconfig.json
sosdocsunix.txt
System.AppContext.dll
System.Buffers.dll
System.Collections.Concurrent.dll
System.Collections.dll

...

C:\MyApp\project.json

{
  "buildOptions": {
    "debugType": "portable",
    "emitEntryPoint": true
  },
  "dependencies": {},
  "frameworks": {
    "netcoreapp1.0": {
      "dependencies": {
        "Microsoft.NETCore.App": "1.0.1"
      }
    }
  },
  "runtimes": {
    "ubuntu.14.04-x64" : {},
    "win10-x64" : {}
  }
}

C:\MyApp\Program.cs

public class Program
{
    public static void Main(string[] args)
    {
        System.Console.WriteLine("Hello World!");
    }
}

See Also

This document differentiates between framework-dependent and self-contained deployments.

How to run a .NET Core console application on Linux

Follow the below steps to run your application:

1. Publish your application as a self contained application:

   dotnet publish -c release -r ubuntu.16.04-x64 --self-contained
   

2. Copy the publish folder to the Ubuntu machine

3. Open the Ubuntu machine terminal (CLI) and go to the project directory

4. Provide execute permissions:

   chmod 777 ./appname
   

5. Execute the application

   ./appname
   

ASP.NET Core NodeServices on Azure Linux WebApp

After a long research and the assistance of Microsoft's Engineer https://github.com/caroe2014 this is the three steps final answer:

1) Startup.cs

    services.AddNodeServices(options =>
        {
          if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
          {
            options.ProjectPath = Path.GetFullPath("/home/site/wwwroot");
          }
        }
      );

2) And what I found is Node is not present in the container so it is necessary to have a script to install and start it before starting the app itself. So I have this start1.cs file:

#!/bin/bash

apt-get install curl
curl -sL https://deb.nodesource.com/setup_12.x | bash
apt-get install -y nodejs

set -e
export PORT=8080
export ASPNETCORE_URLS=http://*:$PORT
dotnet "Web.Identity.dll"

Where Web.Identity.dll is the dll of my app.

3) Set startup command to /home/site/wwwroot/start1.sh (On Azure Portal - App service Configuration - or Azure DevOps).

That's all.

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