HetznerWorkerHost

public sealed class HetznerWorkerHost : IWorkerHost

One Hetzner Cloud VM per worker, created through the Hetzner Cloud API (https://docs.hetzner.cloud). Each VM boots Ubuntu with a cloud-init script that downloads the Linux server build from the orchestrator over the private network, reads its own private IP from the Hetzner metadata service, and starts the worker role as a systemd unit advertising that private IP. Killing a worker deletes its VM. On Initialize every VM labelled with this mesh id is deleted, so a restarted orchestrator never inherits (and pays for) stale machines.

All HTTP work runs on the thread pool; results are queued and applied in Tick on the main thread, where the JSON is parsed with JsonUtility.

Constructors

HetznerWorkerHost

public HetznerWorkerHost(CloudHostSettings settings);

Properties

Name

public string Name { get; }

IsReady

public bool IsReady { get; }

InitializationError

public string InitializationError { get; } = "";

Methods

Initialize

public void Initialize(Action<string, string> log);

Launch

public IWorkerHandle Launch(WorkerLaunchSpec spec);

Kill

public void Kill(IWorkerHandle handle);

Tick

public void Tick();

WriteHandleJson

public void WriteHandleJson(IWorkerHandle handle, JsonWriter w);

Dispose

public void Dispose();

BuildCloudInit

public static string BuildCloudInit(string buildUrl, string workerArgs);

Boot script for a worker VM. Waits for the private interface, fetches the build from the orchestrator, and runs the worker as a systemd unit. $PRIVATE_IP in workerArgs expands on the machine.