In this article, you’ll learn how to deploy Microsoft SQL Server 2019 on Red Hat OpenShift. We’ll then use SQL Server from an ASP.NET Core application that is also deployed on OpenShift. Next, I’ll show you how to connect to SQL Server while working on the application from your local development machine. And finally, we’ll connect to the server using Azure Data Studio.
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In this article, we’ll look at using OpenAPI with .NET Core. OpenAPI is a specification for describing RESTful APIs. First, I’ll show you how to use OpenAPI to describe the APIs provided by an ASP.NET Core service. Then, we’ll use the API description to generate a strongly-typed client to use the web service with C#.
Writing OpenAPI descriptions
Developers use the OpenAPI specification to describe RESTful APIs. We can then use OpenAPI descriptions to generate a strongly-typed client library that is capable of accessing the APIs.
Note: Swagger is sometimes used synonymously with OpenAPI. It refers to a widely used toolset for working with the OpenAPI specification.
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.NET Core 2.2 has been released. You can try it on Red Hat Enterprise Linux (RHEL) and OpenShift. One of the new features of ASP.NET Core is the Health Checks API.
In this article, which was written for C# Advent Calendar 2018, I show an example of how the API works with OpenShift by implementing two health checks for the Kubernetes liveness and readiness probes. Since OpenShift includes Kubernetes, this example also works well with Kubernetes.
Continue reading “Using Kubernetes readiness and liveness probes for health checks with ASP.NET Core 2.2 on OpenShift”
Last year, I wrote a blog post how to remotely debug your ASP.NET Core container on OpenShift with Visual Studio Code. Today I introduce how to remotely debug a pod using Visual Studio from your Windows computer. Sometimes you encounter an issue that happens only in the production environment. Remotely debugging a pod enables you to investigate such an issue.
Visual Studio and Visual Studio Code now support SSH as a transport protocol for remote debugging. If a remote host accepts an SSH connection, Visual Studio can do remote debugging using Visual Studio’s default feature. However, you need to use the
oc command instead of an SSH client such as putty since Red Hat OpenShift pods don’t allow direct connections via SSH. The MIEngine debugger enables you to use any command for SSH connection.
All the steps below have been confirmed using a combination of Visual Studio 2017 (versions 15.7.2 and 15.8 preview2) on Windows 10 and OpenShift 3.9.
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Visual Studio provides a graphical remote debugging ASP.NET Core app with Docker Tools for Windows. Since Visual Studio supports SSH protocol, you can remote debug ASP.NET Core process running on the Linux host. It used to be if you install and setup SSH server on docker container, you can remote debug with Visual Studio. However, it’s strongly not recommended due to security reasons. Now I’ll explain to you how to remote debug your ASP.NET Core on OpenShift with Visual Studio Code by using
oc exec command instead of installing SSH server on docker container. You can use Microsoft proprietary debugger engine
vsdbg with Visual Studio Code (or other Visual Studio products). Visual Studio Code can integrate other commands than
SSH for debugger transport protocol.
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Most books teaching C# start with a ‘Hello World’ application. This simple program is used to explain concepts like namespaces, classes, Main and Console.WriteLine. When every line of the code has been dissected, it’s clear how it works.
It’s less obvious for an ASP.NET Core application. We are no longer invoking our code; instead, the ASP.NET Core framework is doing that for us. In this blog post, we’ll look at a simple ASP.NET Core application and explain how ASP.NET Core makes it tick.
Continue reading “ASP.NET Core Hello World Explained”