Tag

docker

Azure, Debugging, Web, WebApi

Debugging a managed identity connection to Azure SQL in Azure App Service using containers

So you’ve been eager to deploy your containerized web application that you’ve been working on for a while, to Azure App Service. You follow the best security practices which means you’ve setup your connection to your Azure SQL database using a managed identity. Upon loading your application, you get a dreadful exception that you can’t connect to the database. You then wonder, is this a database permission problem or some another problem, such as the application cannot connect to the database using its managed identity. This problem is even tougher to diagnose in applications such as Custom Off the Shelf (COTS) that you don’t have the source code. Rest assured, this happen to the best of us (yes, even me!)….

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October 17, 2024 | by Dominique St-Amand | 2 Comments
Docker, Kubernetes, Server administration

Installing a Kubernetes cluster on VMware vSphere and what I’ve learned

The topic of containers has been a hot topic for some time now. As a developer and architect, I want to be able to include them in my development SDLC for the various reasons you guys know. I won’t go in detail about them in this article, because after all you came to see how it was done right? :-). After having some container images waiting in a registry and awaiting to be used, I asked myself, how do I manage the deployment, management, scaling, and networking of these images when they will be spanned in containers? Using an orchestrator of course! Kubernetes (k8s) has become one of the widely used orchestrator for the management of the lifecycle of containers….

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September 7, 2020 | by Dominique St-Amand | 2 Comments
Docker

Accessing raw dd images in a Docker Linux container

I was backing up a Linux server of mine the other day and I wanted to have a full backup (along with regular tar.gz backups) of the main disk mounted on the /dev/sda partition. You can backup your partition using dd with a command such as dd if=/dev/sda | dd of=/home/archive/disk.img If everything works, you will get an output similar to below:

I was then looking to mount that backup raw image in order to check if everything was OK. You can do that by using the loop device in Linux. A loop device is a pseudo (“fake”) device (actually just a file) that acts as a block-based device1. My main OS is Windows and I did not have access to a Linux…

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July 12, 2020 | by Dominique St-Amand | Leave a comment
C#, Docker

Running an ASP.NET Core application targeting .NET Framework in Docker

Recently, I’ve came across an interesting challenge that was to dockerize an ASP.NET Core 2.2 application targeting .NET Framework 4.7.2. The reason this application was targeting .NET Framework was because it was using a library that unfortunately had no plans to move to the .NET Core platform. That library was a port from Java. As such I had to take a decision: rewrite the whole application in Java to support this library more natively, or try to find an alternative library that did the same thing. Sometimes it’s better to sleep on such decision. Well it paid off. I had forgotten that possibly I could use mono to run it. I took this as a challenge and used one of…

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September 29, 2019 | by Dominique St-Amand | 1 Comment
Azure, Docker

Connecting to Azure Redis Cache with Docker

If you are a Windows user and you want to access your Redis cache, you probably have realized that getting the redis-cli for Windows is not as easy as 1,2,3. You probably also wandered around the internet trying to find a free GUI that does the job of access Redis in a secure way (that is that is supports SSL/TLS out of the box). You then realized again that they probably have limitations themselves and it’s also not easy as 1,2,3. Your last solution, use the redis-cli that comes with the redis server on a linux flavored distro. Lucky for you, in Windows 10, you can install the Linux subsystem and then install redis which includes the redis-cli. Great, but…

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March 24, 2019 | by Dominique St-Amand | 1 Comment