All Posts

All Posts (569)

• 

  Published on

  2022-02-08 6:32 a.m.

  Authors

  koskila

  Tags

  AzureDevOpsAzureIoTEdgeJmespath

  Azure IoT Edge gotchas - and how to overcome them!

  This article describes the gotchas and weird one-offs that I've encountered with Azure IoT Edge so far. Consider them not-too-thoroughly tested quick fixes that aren't significant enough to warrant an actual blog post themselves :) Okay - let's get to them gotchas, then! Random learnings from Azure IoT Edge projects

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• 

  Published on

  2022-02-01 4:25 a.m.

  Authors

  koskila

  Tags

  AzureIoTEdgeVSCode

  How to fix "Cannot start service edgeHubDev: Ports are not available: listen tcp 0.0.0.0:8883"

  Here is another fun one for the books! In this article, I will explain how to fix a problem with the Azure IoT Edge dev simulator, when it fails to start due to an underlying problem with Docker not having access to your defined ports. This will probably happen to one of the ports used by the Edge Hub system module by default - 5671, 8883, or 443.

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• 

  Published on

  2022-01-27 4:26 a.m.

  Authors

  koskila

  Tags

  AzureIoTEdgeDockerVSCodeDevEnvironment

  How to fix "exec user process caused: no such file or directory" in Docker on Windows?

  Another one in the series of "random things that break when you try to run Docker on Windows"! I was just minding my own business, trying to run an Azure IoT Edge custom module - a Docker container, really - locally, when suddenly everything broke and one of my Docker containers wouldn't run anymore, which broke the rest of my stuff pretty badly. Instead, it failed with a cryptic and surprising error "exec user process caused: no such file or directory" .

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• 

  Published on

  2022-01-25 5:29 a.m.

  Authors

  koskila

  Tags

  EntityFrameworkCoreEFCore

  How to run EF Core commands when your entities are in a different project from your dbcontext?

  This article explains how to achieve that nice configuration where you can reuse your .NET EF Core (Entity Framework Core) entities in different projects - even being separate from the project holding your DbContexts! You might want to do this if you have a common data model between a number of very different projects - but you will still need to have a way to add new migrations, apply the current ones to a database or possibly remove deprecated migrations.

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• 

  Published on

  2022-01-18 7:04 a.m.

  Authors

  koskila

  Tags

  DockerPostgreSQLTimescaledb

  How to run SQL commands in a Postgre SQL Docker container?

  This article will explain how to run your arbitrary SQL commands against a Postgre SQL database running in a Docker container in Windows. That should be super simple, but since I never remember anything like this by heart, I had to google it - and turns out, either I didn't know how to google this properly or people haven't bothered to document this. So, let's fix that. But first, why did I need to do this, again?

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• 

  Published on

  2022-01-11 3:12 a.m.

  Authors

  koskila

  Tags

  CORSHtaccessWordPress

  How to modify CORS settings using a .htaccess file

  Recently, I needed to host a web-based thingamajiggy in WordPress and needed to include a couple of custom libraries. For the sake of quick iteration, I decided to use a public FTP folder that I already had on the same server in order to host this. So I had configured a subdomain to host the files, and wanted to reference them from my WordPress site. Not quite a CDN, but something a little bit like that. Well, of course, I ran into an issue again.

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• 

  Published on

  2022-01-04 3:43 a.m.

  Authors

  koskila

  Tags

  DockerWSLDevEnvironment

  How to solve Vmmem consuming ungodly amounts of RAM when running WSL?

  This was another (luckily pretty shallow) rabbit hole down some corporate IT and weird default configurations by our favorite tech-daddy Microsoft. In this article, I will describe one possible reason for a process called Vmmem.exe consuming enough RAM to crash pretty much everything else running on your machine. But let's take a step back first - what happened?

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• 

  Published on

  2021-12-31 11:50 a.m.

  Authors

  koskila

  Tags

  YearReviewOpinion

  2021 - Year Review!

  Well, it's been a year. It certainly does not feel like it has been a whole 12 months since I last wrote one of these, you know? I failed every single one of the goals I set for 2021, but I'm not going to lie, family takes (and deserves) so much time that it is no wonder that our hobbies suffer a bit. But still - writing these year reviews has become a tradition, so without further ado - let's get to it! 😁 Website stats

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• 

  Published on

  2021-12-20 10:30 a.m.

  Authors

  koskila

  Tags

  AzureFunctionsAzureIoTHub

  How to fix "Microsoft.WindowsAzure.Storage: Server encountered an internal error. Please try again after some time." when using IoTHub trigger for Azure Functions?

  One more article before Christmas! 😁 This time, I'll be fixing a function that's triggering based on new messages received through my IoT Hub in my Azure Functions project. Technically speaking, this is super simple to implement - your function needs to define an IoTHubTrigger , with an Event Hub name and usually a Connection String (I don't know why I'm Sentence Casing that, too, but I'll stick to it!

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• 

  Published on

  2021-12-15 6:05 a.m.

  Authors

  koskila

  Tags

  AzureDevOpsnpm

  How to authenticate against npm registries in Azure DevOps?

  Another one in the series of "this should've been easy, but alas, you're the edge case". "You" being "me", and the "edge case" being our internal npm feed (registry), for whatever reason. Ah, well - life would be extremely boring if everything always went according to documentation, right? So, instead of the built-in ways to access npm feeds, this solution includes some PowerShell. Ah - that's when you know it's going to be good, right?

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• 

  Published on

  2021-12-10 3:57 a.m.

  Authors

  koskila

  Tags

  SignalRWebsockets

  How to test SignalR-connection in the browser?

  So a while back I posted about testing your "vanilla" WebSockets connection directly in the browser - and while that's nice and easy, sometimes you need to class up a bit. In my case that meant upgrading to SignalR (for some corporate and enterprisey reasons as usual). It makes sense to leave behind the easy, simple, lightweight and somewhat transparent WebSockets to "upgrade" to the enterprise-ready (and arguably quite a lot less transparent) SignalR?

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• 

  Published on

  2021-12-07 4:20 a.m.

  Authors

  koskila

  Tags

  AspNetCoreSignalRWebsockets

  How to access claims of a SignalR user in ASP.NET Core?

  I tend to post a lot of articles about different gotchas and configuration tweaks, but this one goes back to the roots a bit - just me and a couple of other devs hacking some code together and being blocked by a bit of an obstacle, that's then fixed by - you guessed it - writing niftier code. Or actually, I suppose it was more about removing some and adding some of the right stuff... But isn't that what most programming is about? Anyway - let's take a look at configuring SignalR for an ASP.

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• 

  Published on

  2021-12-01 4:52 a.m.

  Authors

  koskila

  Tags

  AzureFunctionsDevEnvironment

  Azure Function build fails with "Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: Microsoft.AspNetCore.Mvc.Core"

  Another fun one with Azure Functions! At least it's a simple one: this time, I ran into a weird issue while doing some code reusing - well, copy-pasting - between a couple of different projects. I was lovingly hand-crafting some Azure Functions, while suddenly the Azure Functions host would throw this in ugly red letters: Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: 'Microsoft.AspNetCore.Mvc.Core, Version=3.1.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' at Mono.

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• 

  Published on

  2021-11-23 7:41 p.m.

  Authors

  koskila

  Tags

  AuthenticationAzureAzureKeyVault

  How to update from deprecated Microsoft.Azure.Services.AppAuthentication to new and shiny Azure.Security.KeyVaults.Secrets?

  So, a while ago I posted about a fairly simple way to write your code for fetching secrets (and other confidential stuff) from Azure Key Vault in such a way, that it would work the same way both in Azure and on your local dev box. I find this pretty important, as it reduces the need for weird workarounds and fallbacks in your code, and at the same time enables you to harness the Azure Key Vault for that sweet spot of "good enough security without breaking your back or the bank".

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• 

  Published on

  2021-11-16 4:03 a.m.

  Authors

  koskila

  Tags

  BlazorAzureAD

  Fixing Blazor WebAssembly .NET 6 MSAL authorization bug

  Let's make this short and sweet. In this particular case, upgrading a Blazor WASM solution to .NET 6 broke the authentication when deployed to Azure. The same issue could probably happen to a fresh project, though. This is what you're running into: If you open your browser console, you'll see 2 interesting errors - first: dotnet.6.0.0.o2we6pverp.js:1 mono_wasm_runtime_ready login.microsoftonline.com/common/oauth2/v2.

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• 

  Published on

  2021-11-09 3:21 a.m.

  Authors

  koskila

  Tags

  GitGitHubDevEnvironment

  How to nuke your Git(Hub) commit history?

  Ah - this was a fun one. I needed to figure out how to purge, flush and clear your commit history on GitHub. Turns out it isn't as easy as clicking a button in the web user interface - the world is apparently not ready yet! 😁 Luckily, it wasn't that complicated either - and the steps should work for other flavors of git as well. Background Always remember to .gitignore your secrets, folks! And if you forget, pray you're not committing to a public repository!

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• 

  Published on

  2021-11-02 6:48 a.m.

  Authors

  koskila

  Tags

  AzureFunctionsAspNet

  How to fix "Unable to cast object of type 'System.Net.Http.HttpRequestMessage' to type 'Microsoft.AspNetCore.Http.HttpRequest'."

  This article explains how to fix an issue where your Azure Functions function (yes, that's a capital F and a lowercase f to denote the difference between the product and the piece of compute) fails to fire when a POST request comes in, even though it's configured to do so, and instead throws a somewhat confusing error message about HttpRequestMessage not being castable to HttpRequest - even though you KNOW HttpRequestMessage works just fine for receiving POST requests with payload!

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• 

  Published on

  2021-10-26 5:16 a.m.

  Authors

  koskila

  Tags

  AzureKeyVaultVisualStudio

  How to authenticate against Azure Key Vault both in Azure and local development environment?

  Azure Key Vault is great. But when developing locally, it can be a bit of a pain. You can always circumvent it and create some classical solution, such as simply wrapping all of your key/secret assignments in if-else-clauses that will use local configuration if you're running locally and only call the Azure Key Vault if you're in the cloud... But that feels so incredibly early-2000-ish. Isn't there a better option available? I mean - obviously, there is!

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• 

  Published on

  2021-10-19 8:12 p.m.

  Authors

  koskila

  Tags

  CosmosDBDotnet5

  System.Text.Json.JsonPropertyName not working for CosmosDb in .NET Core/5/6?

  This article explains how to fix an annoying issue with Microsoft's SDK for CosmosDb v3 - it comes with a Newtonsoft.Json dependency, that most of Microsoft's recent packages have let go of. With .NET Core 3.1 having shipped with System.Text.Json included, and (mostly) replacing Newtonsoft.Json, it's kind of the preferred option. However, CosmosDb v3 SDK doesn't support it and by default requires you to use Newtonsoft.

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• 

  Published on

  2021-10-12 4:28 a.m.

  Authors

  koskila

  Tags

  AssemblyGraphAPI

  Errors loading an assembly that's using Microsoft Graph API

  Man, do I run into all kinds of issues with the smallest Azure Functions that I develop. And it's mostly my fault. The silver lining is that you're here to read this article, so you probably ran into this same stuff. Well - you should be happy to hear that this article describes fixes to a couple of issues - let's see if they help you out as well!

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• 

  Published on

  2021-10-05 3:12 a.m.

  Authors

  koskila

  Tags

  AzureFunctionsCosmosDBDevEnvironment

  ILogger binding suddenly failing for Azure Functions - what to do?

  This article explains another fun issue that you might run into when developing Azure Functions in your local environment. It was weird how unclear the few results were that I could find. And the issue is just... very hazy in general. But I was able to track the issue down, and thought I'd document the solution :) It's for myself, really, because I'm pretty sure I'll run into this one again. But if you find it useful, good for you! 😉 Problem So what is it that is failing?

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• 

  Published on

  2021-09-28 6:57 a.m.

  Authors

  koskila

  Tags

  EntityFrameworkCoreCodeFirst

  "dotnet ef script" or "Script-Migration" producing empty .sql files?

  Another day, another issue. This time, I was absent-mindedly following the guidance for a project on how to generate .sql files for .NET EF Core code-first migrations. Don't ask why that was required, but it was. My migration was simple. Adding an entity with just a few properties. And Entity Framework created my programmatic migration just fine. But when generating the SQL file, I got nothing but an empty file.

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• 

  Published on

  2021-09-20 10:41 a.m.

  Authors

  koskila

  Tags

  IISReactWebconfigOnPremises

  How to fix a 403.18 in a virtual application?

  Another day, another issue - this time with an on-premises environment with a ridiculously complicated architecture and an absolute ton of pipelines. There are plenty of ways to fix this particular issue (because there are plenty of reasons), and after ferocious googling (and a very brief binging just to see if Microsoft had found something Google hadn't), the trail ran cold and I felt like nobody had run into the same issue before.

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• 

  Published on

  2021-09-15 4:22 a.m.

  Authors

  koskila

  Tags

  GitHub

  GitHub Action fails with "The GITHUB_TOKEN environment variable was not set"

  Another day, another thing that I am trying to do on GitHub (and partially failing), and another blog post! This time I was configuring a build and ran into trouble. This article describes one possible fix to an issue where an error is thrown along the lines of "The GITHUB_TOKEN environment variable was not set".

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• 

  Published on

  2021-09-07 5:53 a.m.

  Authors

  koskila

  Tags

  Youtubedl

  How to download audio files from Vidyard

  Today, I'm documenting a simple way to download audio files from Vidyard. This approach only works for files that aren't password-protected or behind authentication - I don't think you can use it easily for nefarious stuff, but just in case you're trying to commit some kind of IP theft (intellectual property), please don't. And definitely do not ask for instructions in the comments section :) Anyway - why did I take up this task? What did I want to achieve, in order to need... This?

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