Docker cheatsheet

Attach to a running container

docker exec -i -t <container> /bin/bash

Run networking tools

docker run -d praqma/network-multitool --name netshoot
docker exec -it netshoot /bin/bash

Test network connectivity

apt update
apt install net-tools
apt install curl
curl -kv
      

To stop all docker containers in PowerShell

docker ps -a -q | ForEach { docker stop $_ }
      

Show the logs for a container

docker logs <container>
      

Show networks

docker inspect <container>
      

Git cheatsheet

Tags

Create a tag	git tag -a 1.0.0 -m "First release"
Delete a remote tag	git push --delete main 1.0.0

Commits

Remove all commit history and set the code as the only commit	git checkout --orphan newBranch git add -A # Add all files and commit them git commit git branch -D master # Deletes the master branch git branch -m master # Rename the current branch to master git push -f origin master # Force push master branch to github git gc --aggressive --prune=all # remove the old files

Durable Functions vs Bespoke Event Sourcing

 You can write an application that uses Event Sourcing using code like the asos-eventsourcing and SimpleEventStore.

However, you can take advantage of the built-in event sourcing capabilities of Durable Functions.

Open TTD settings

Settings

Settings > Interface > General > Close window on right-click: on

Settings > Disasters/Accidents > Vehicle breakdowns: none

Settings > Localisation > Speed units: Imperial (mpg)

Settings > World Generation > Road vehicles: Drive on left

Settings > Limitations > Vehicles never expire: on

Settings > Environment > Authorities > Allow buying exclusive transport rights: off

GRFs

BRTrains v2

British Town Names

Get an app to open this 'ms-gamingoverlay' link error

Whenever I loaded OpenTTD on a locked-down machine it raised the error 

"Get an app to open this 'ms-gamingoverlay' link"

This was because Windows had detected a game had been loaded and started to invoke XBox Game features - such as the Game Bar and the ability to record video. However the PC was locked down through policy and these features were unavailable. Clicking on the "Browse Microsoft Store" link wouldn't work because the Windows Store was removed by policy.

This article helped.

Creating the DWORD registry key

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\GameDVR\AppCaptureEnabled

and setting the value to 0 fixed it.

Removing X-Frame-Options in ASP.NET MVC Core 7

I had an ASP.NET Core 7 App that used forms.

And I actually WANTED it to be used within an iFrame.

As soon as you add a form to a Web App, the server immediately starts returning X-Frame-Options: SameOrigin in all requests.

I tried a variety of means to remove this, including:

app.UseStaticFiles();

            app.Use(async (context, next) =>

            {

                context.Response.Headers.Remove("X-Frame-Options");

                context.Response.Headers.Add("Bob", "Hello");

                await next.Invoke();

            });

            app.UseRouting();

The Bob header was being added, but X-Frame-Options stubbonly remained.

In the end I found the solution was to use:

// Remove X-Frame-Options, allowing Framing

            builder.Services.AddAntiforgery(options =>

            {

                options.SuppressXFrameOptionsHeader = true;

            });

The ASP.NET Core security headers guide (elmah.io)

Enable Cross-Origin Requests (CORS) in ASP.NET Core | Microsoft Learn

ASP.NET Core Middleware | Microsoft Learn

Transferring domains to Google

I decided to leave 123-reg after they chose to upgrade their email services and removed catch-all email forwarding. I found a slight issue when transferring Nominet (.uk) domains to Google. The transfer process requires Google to send a handshake email to the registrant's email address, requesting them to approve the transfer. However, if you don't have a gmail address registered, you don't seem to get an email. So it is important to set the registrant's contact email to a Gmail address first, before setting the IPS tag.