I was a big fan of ARM templates: for many years I’m applying ARM templates on a large number of projects for all kinds of customers. I’ve written articles and blog posts about ARM templates. Have given many workshops and started collecting ARM templates used in enterprises ready for production. I’ve written the Best practices with ARM Templates article together with my colleague Peter Groenewegen, which is the most visited blog post of Xpirit and it’s also published by Microsoft. It’s clear I was a big fan of ARM templates. But times are changing.
You have developed a microservice in .NET Core 2 and want to host it as a Docker Container in Kubernetes. Your Microservice contains settings, some appsettings or connectionstrings for example. These settings differ over environments. You can treat this configuration for Kubernetes on different ways. This blogposts shows you how to handle settings over environments prepared for Continuous Delivery.
Previous blogpost coveres all steps to create a Docker Image from a .NET Core 2 WebAPI application on your local machine. After that, the Docker Image was pushed to Azure Container Registry (ACR). The deployment to Kubernetes pulled this Docker Image from ACR and runs a number of instances. All steps were executed manually. Let’s automate this using VSTS.
25-8-2016: Update because the UI to create a Service in VSTS changed
When you want to access Azure from VSTS there are multiple possibilities. It’s for example possible in VSTS to configure an Azure Classic Endpoint and after that configure the endpoint with credentials or with a certificate. The ARM way is to add an Azure Resource Manager Endpoint. To configure this you will need the settings of an Azure Service Principal. This blogpost tells you how to create both the Service Principal in Azure and the ARM Endpoint in VSTS.
The Azure WebApp Configuration task reads VSTS variables and adds those as AppSettings and ConnectionStrings to an Azure WebApp. The task also supports Slot Settings. The task can be linked to a web.config to validate if all AppSettings and ConnectionStrings in the web.config exists as VSTS variable.