Replatforming Azure Functions into an Azure Functions Container

Introduction

A while ago I talked about  “Faas/Serverless” in relation to vendor lock-in. Today we’ll be continuing in that road, where we’ll be doing a small proof-of-concept (PoC). In this PoC, we’ll be replatforming existing Azure Functions code into an Azure Functions container!

 

Things to know

Since Azure Functions 2.0 (in preview at the time of writing this post), you are able to leverage containers. Though be aware that there are several known issues. Do check them out first before embarking on your journey!

 

Testdriving 2.0

So first, we’ll start off with testing the Azure Functions Core Tools!  If you’re looking to follow this guide, be sure to have the Azure Functions Core Tools installed, which also depends on .NET Core 2.0 and Nodejs. Once you have those installed, do a “func –help”, and you’ll see what capabilities are at hand…

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A first glance at the preview AKS (Azure Kubernetes Service)

Introduction

Today the new “AKS” (Azure Kubernetes Services) was launched in preview. This is a managed container service. So where ACS used to rely on IaaS and used a set of best practices to deploy the cluster. AKS will go a step further, where it’ll managed the master nodes & provide upgrade tracks.

 

Deploying

Let’s start with deploying an AKS cluster… Here we can select the k8s (kubernetes) version too.

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From Github to ACI – A tale how to use Visual Studio Team Services & Azure Container Registry for Container CI/CD

Introduction

Today’s post is conceptually a rather simple one… Let’s see how we can go from this ;

To here ;

By using a CI/CD pipeline.

 

Flow of the day

What will we be doing today?

  • Kick-off a VSTS build once a change has been made to our Github repo
    • Build a container via VSTS
    • Publish the container to an ACR (Azure Container Registry)
  • Kick-off a VSTS release once the build succeeded
    • Use an ARM template to deploy an ACI (Azure Container Instance) with our docker container underneath

Sound cool? Let’s get to it!

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Azure Service Fabric : Deploying your first container…

Introduction

In the past I’ve already done several posts about containers. This by using various orchestrators & workflow management tools. Today’s post will be about deploying a Linux container with Service Fabric… The main goals is to provide you with the look & feel of the initial steps. In a future posts, I’ll delve into the more advanced stuff (like data persistence & inter-container connectivity).

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A quick glance at the newly announced Azure Container Instances

Introduction

The Azure Container Instances (ACI) have just been announced. Today we’ll take a quick glance on how it looks in reality. Though what are ACIs?

Azure Container Instances offers the fastest and simplest way to run a container in Azure, without having to provision any virtual machines and without having to adopt a higher-level service.

Want to try it yourself? Check out the ACI Quickstart!

 

Let’s see how it looks?

In contrast to the quick start, I’m going to use the portal… This is currently not the preferred way, though let’s see how that one looks at the moment.

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Issue : Failed to pull image : rpc error: code = 2 desc = unknown blob

Introduction

When you are deploying an image, which is hosted on a private registry, to a kubernetes (k8s) cluster with windows nodes… Then you might get the following error ;

Failed to pull image “kvaes.azurecr.io/kvaes2017:v1“: rpc error: code = 2 desc = unknown blob
Error syncing pod, skipping: failed to “StartContainer” for “private-reg-container” with ErrImagePull: “rpc error: code = 2 desc = unknown blob”

 

Context

So what did my setup look like?

  • Orchestrator : Kubernetes for Windows (Azure Container Service)
  • Registry : Private (Azure Container Registry)
  • Image : Windows Nano Based

 

Technical Check

Let’s deploy two pods…

The first I’ll deploy via yaml, which is basically the example from the kubernetes docs on pulling an image from a private repo

Now the second one is an adaptation of the example flow from the Azure Container Service documentation ;

Now let’s see how that one went…

The first one failed, and the second one passed! What was the difference?

 "nodeSelector": {
    "beta.kubernetes.io/os": "windows"
    }

Apparently this one forces the switch to “windows container mode” (or something like that…). As it seems very similar to the following thread

 

TL;DR

When deploying windows containers to a kubernetes cluster. be sure to the set the “nodeSelector” or you might end up with errors on pulling the image.

Azure Container Service : Using the Azure File Storage as a persistent (kubernetes) volume

Introduction

Today’s post is a brief one… Though it packs some punch! In the past I talked about storage patterns for docker/containers. Today we’ll touch how you can leverage the Azure File Storage as a shared & persistent storage for your container deployments. Kubernetes has been gaining a lot of traction, and that one has support for the Azure File Storage as a persistent volume too.

 

Demo Files

Want to run this yourself? Check out the following GitHub repository!

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