![]() ![]() An important part of that is having liveness/health checks, that check that the application hasn't crashed. The problem is, I'm running applications in Kubernetes. Now, in ASP.NET Core 3.0, those problems have been resolved, but I still don't use the generic host… Well, yes, but due to the issues in the 2.x implementation of worker services, I typically still use a full WebHost based ASP.NET Core app, instead of a generic Host app. The one time I use this approach is when building worker services that run background tasks in Kubernetes.īut wait, isn't the whole point of worker services that they don't run Kestrel and expose URLs? It would be incredibly irritating to have to type a new URL into your browser (instead of just hitting refresh) every time you restart the app. On the face of it, having your application listen on a different URL every time you restart it doesn't sound very useful. That may or may not be a problem for you. The downside of choosing at random port at runtime is that you get a different pair of ports every time you run the application. it binds to all IP addresses on the machine. Even a hostname is treated the same as * i.e. The * isn't actually special, you just need to use something that isn't a valid IPv4 or IPv6 IP address (or localhost). Press Ctrl+C to shut down.Īlternatively, instead of binding to the loopback address, you can bind to any IP address (using a random port) with the following command: dotnet run -urls " This binds to all IPv4 and IPv6 addresses on a random port. For example, to bind to a random http and https port on the loopback (localhost) address, run your application using the following command: dotnet run -urls " This will randomly select a pair of ports that aren't currently in use, for example: info: Īpplication started. You can achieve exactly this by using the special port 0 when setting the URL to use. When you're developing locally, you might not care about that, just run the application! Unfortunately, all of those approaches still require that you choose a port to use. In my previous post, I showed some of the ways you can set the URLs for your ASP.NET Core application. Randomly selecting a free port in ASP.NET Core I'll also show how you can work out which port the application has selected from inside your app. In this post I show one way to resolve the problem by randomising the ports ASP.NET Core uses when it starts the application. NET Core project attempted to start, the port would conflict, and they'd the see error above. Unfortunately, the MacBook had a driver installed that was already bound to port 5000, so whenever the.NET project using a template, it always uses the same URLs, defined in System.IO.IOException: Failed to bind to address : address already in use. Unfortunately, when they attempted to start their new application they received the following message: crit: This post is in response to a discussion I had with a friend recently who was trying out. ![]()
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