Extensions.Hosting.Systemd.Watchdog 1.0.0-alpha.1

This is a prerelease version of Extensions.Hosting.Systemd.Watchdog.
There is a newer version of this package available.
See the version list below for details.
dotnet add package Extensions.Hosting.Systemd.Watchdog --version 1.0.0-alpha.1
NuGet\Install-Package Extensions.Hosting.Systemd.Watchdog -Version 1.0.0-alpha.1
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="Extensions.Hosting.Systemd.Watchdog" Version="1.0.0-alpha.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Extensions.Hosting.Systemd.Watchdog --version 1.0.0-alpha.1
#r "nuget: Extensions.Hosting.Systemd.Watchdog, 1.0.0-alpha.1"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install Extensions.Hosting.Systemd.Watchdog as a Cake Addin
#addin nuget:?package=Extensions.Hosting.Systemd.Watchdog&version=1.0.0-alpha.1&prerelease

// Install Extensions.Hosting.Systemd.Watchdog as a Cake Tool
#tool nuget:?package=Extensions.Hosting.Systemd.Watchdog&version=1.0.0-alpha.1&prerelease


Adds support for Systemd Watchdog to Microsoft.Extensions.Hosting.Systemd



Add the packages Extensions.Hosting.Systemd.Watchdog which is hosted on NuGet.

Enabling watchdog:

Invoke the UseSystemd overload that takes a bool.

var host = new HostBuilder()
    .UseSystemd(enableWatchdog: true)
    .ConfigureServices((hostContext, services) =>
        services.AddSingleton<IHealthCheck>(new SignalHealthCheck(TimeSpan.FromMinutes(5)));

Register health checks

The watchdog needs an implementation for IHeathCheck and the results of its IsHealhty property is used to notify the state to systemd. Register at least 1 IHealthCheck implementation. The watchdog routing will probe all registered implementations.

var host = new HostBuilder()
    .UseSystemd(enableWatchdog: true)
    .ConfigureServices((hostContext, services) =>
        services.AddSingleton<IHealthCheck>(new SignalHealthCheck(TimeSpan.FromMinutes(5)));

Not registering at least one health check will result in a startup failure.

Example health check

The following example implementation relies on the application that a critical component will frequently "signal" that they are still healthy. For example, signaling after a certain task to complete successfully. The approach is very useful if the task can actually take a long time to complete to not interfere with the watchdog interval.

sealed class SignalHealthCheck : IHealthCheck
    readonly TimeSpan InactivityThreshold;

    DateTime healthExpiration;

    bool IHealthCheck.IsHealthy => DateTime.UtcNow < healthExpiration;

    public SignalHealthCheck(TimeSpan inactivityThreshold)
        InactivityThreshold = inactivityThreshold;
        healthExpiration = DateTime.UtcNow + NoActivityAlertDuration;

    public void Signal()
        healthExpiration = DateTime.UtcNow + NoActivityAlertDuration;


A services was critical to a system but frequently stalls. I wanted to use the watchdog feature to ensure the service gets restarted by systemctl.

Product Compatible and additional computed target framework versions.
.NET net6.0 is compatible.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 is compatible.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

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Version Downloads Last updated
2.0.0 52 5/18/2024
2.0.0-alpha.1 37 5/18/2024
1.0.0-alpha.1 1,003 7/9/2023