How To,Tutorial,Wintellect Blogs

Multi-Stage Builds with Docker

Blaize Stewart

19 May , 2017  

Dockerfile

One of the most anticipated announcements in the Docker space when it comes to building images is Multi-Stage builds because of the huge benefits it gives to CI/CD pipelines in DevOps. Before this announcement, building software in a container usually involved creating a container with all the SDK’s and compilers in the container, uploading code into the container, compiling it, creating a drop, then building another container with just the runtime that sucks in the compiled code to run. This pattern required an external tool and storage to build the container image so it was more burdensome.

Multi-Stage builds on Docker though provide a mechanism for moving the output of a build from a builder container into another container that can be used for running. Consider the following the example. This Dockerfile builds a .NET core app in one container then packages it in another.

#Builder
FROM microsoft/dotnet:1.1.2-sdk-jessie
COPY /myapp /myapp
RUN dotnet restore ./myapp && \
    dotnet build -c release ./myapp && \
    dotnet publish -c release -o pubdir ./myapp

#Final Build
FROM microsoft/dotnet:1.1.2-runtime
COPY --from=0 /myapp/pubdir /myapp
ENV ASPNETCORE_URLS http://+:80
ENTRYPOINT ["dotnet", "/myapp/myapp.dll"]
EXPOSE 80

This file has two FROM instructions, which in a traditional Dockerfile only one is a allowed.… Read more

, , ,

How To,Resources,Tutorial

Migrating Legacy ASP.NET apps to Docker

Blaize Stewart

15 May , 2017  

Containers vs VMs

Many organizations, not wanting to rewrite applications, are figuring out how to take apps and containerize them for the cloud. Older operating systems are either end-of-life or approaching the end-of-life. Likewise, applications are increasingly being migrated to cloud hosts. The need to do this is as pressing as ever and containers offer a simple, viable solution to make this happen. Windows Containers on Docker bring to bear is the ability to “modernize” legacy .NET apps.

Containers by design improves application density on a given hardware by eliminating the need for redundant operating system installs. Unlike virtual machines that provide hardware abstraction on which a guest OS and apps are installed, containers provide operating system level abstraction, and apps run on top of that. This in effects removes all the CPU and memory requirements needed to run individual OS’s for apps and consolidates this into a single operating system (or multiple if running on a cluster). In the end, the savings are realized in terms of disk space, CPU, and memory consumption.

migrating asp.net apps to docker

Microsoft like many other organizations have embraced containers, and have formed a deep partnership with Docker to provide Windows containers. Moving legacy apps to containers is nuanced, and there is no one-size-fits-all approach, but this guide is intended to provide a high-level approach to getting your legacy ASP.NET apps into Windows containers.… Read more

, , ,

How To,Tutorial,Wintellect Blogs

Xamarin Forms for Windows Developers: Tips, Tricks and Lessons Learned, Part 2

Scott Peterson

4 May , 2017  

xamarin forms best practices

The Recap

This series of posts is devoted to all the things I wish I knew, as a long-time Microsoft Enterprise developer, before I provisioned my first xPlatform solution: The 60+ tips, tricks, and lessons learned I’ve accumulated over the last couple of years using Xamarin Forms (in Visual Studio for Windows.)

Many of these things are things an Android or iOS developer (i.e.; college student) probably already knows, but not a Microsoft developer. Some of these things will seem ridiculous to even share, and some so obvious that perhaps some developers will pretend I am the only one who didn’t already know about it. Some of these things will be super-extra important, and some will be meaningless to almost everyone. If you “lean native” you might even argue with me about some of them. That being said, here is the second batch of TTLL:

The Bits

If you’re not using Visual Studio Mobile Center you are totally missing out.

If you haven’t heard of Visual Studio Mobile Center it’s understandable. Have you heard of HockeyApp? If you haven’t heard of HockeyApp, have you heard of a Sony Walkman? Visual Studio Mobile Center is one of the coolest (and most under-marketed) “almost” brand new offerings, from Microsoft for managing mobile app development and development lifecycles.… Read more

, ,

How To,Tutorial,Wintellect Blogs

Xamarin Forms for Windows Developers: Tips, Tricks and Lessons Learned, Part 1

Scott Peterson

3 May , 2017  

Xamarin Forms for Windows Developers

The Confession

Okay, right off the bat, I’m going to admit I’m a Microsoft “bigot” or in less unfriendly terms, a Microsoft “super-enthusiast” with severe “Microsoft is actually better at everything” leanings. I’ve spent most of the last 30 years writing Microsoft-based solutions with Microsoft tools and technologies for clients who are Microsoft “shops.” Still, to this day, I never install any non-Microsoft products on my workstations, except the (still phenomenal) Adobe Fireworks. Yes, Fireworks.

The Challenge

For the last four years, as a weird twist of fate, I have been creating real apps for real clients using the Xamarin platform, and more often than not, Xamarin Forms (or is it Xamarin.Forms? …I can never figure out why we need a dot although it does look cooler that way.) One thing I have noticed is that almost every blog, every post, every slice of documentation that exists for Xamarin Forms seems to be written by someone who “skews native” and not by someone in the actual Microsoft development world. I know why this is, of course, but am not going to write it out loud.

The Observation

Over the last couple of years I also started to notice (mostly) Microsoft developers struggling with the same issues, the same hiccups, and doing the same things that “seemed right at the time” based on documentation, but realized one compile too late, those examples were just “examples” and not to be taken on an empty stomach.… Read more

, ,

How To,Tutorial,Video,Wintellect Blogs

Python Jumpstart for .NET Developers

Wintellect

21 Apr , 2017   Video

python jumpstart

Learn Python in this Webinar geared to .NET/C# Developers

Today Wintellect held a live Python jumpstart coding session for C# Developers presented by Michael Kennedy, host of the TalkPython and PythonBytes podcasts.

A couple weeks ago Michael presented Wintellect’s live webinar “Write Pythonic Code Through 5 Examples.” During this session, we found that 53% of our audience had .NET/C# backgrounds. Keeping this in mind, Michael and Wintellect decided it would be advantageous to do another Python webcast but geared to those with C# backgrounds that wanted to learn the python language. This webinar will give you a Python Jumpstart as we look at the parallels of the two languages and those concepts in Python.

Every major language or platform feature that you know and love in C# there’s a analogous feature in Python and sometimes the feature in Python is even  better.

Michael started the session with a quick Python language introduction about the ecosystem. He then spent the the remaining time building a game for the audience, a version of an old pastime to many “Dungeons and Dragons”.

Following the coding session there was a live Q&A session.

We hope you find this recorded Python webinar session useful. As Michael mentions in the webcast, he will be teaching two upcoming Python workshops if you are interested in learning more.… Read more

, ,

How To,Resources,Tutorial,Wintellect Blogs

Building JavaScript Applications with Angular and Redux

Eric Greene

12 Apr , 2017  

Introduction

The web application world has been disrupted by the plethora of JavaScript technologies which has transformed the development of web applications from being a primarily server-side effort, to primarily a client-side one. Ever since jQuery made cross-browser web applications easy for everyone to create, a steady stream of JavaScript libraries and frameworks have been released at a frantic pace, with each one doing something better, or faster, or both. The overwhelming pace of advancements has left the JavaScript developer exhausted, and the reluctant server-side developer sometimes generations of JavaScript advancement behind. For anyone seeking to catch up, the key is to identify the latest technologies which survive the all-too-common quick obsolescence many JavaScript technologies experience. Instead, JavaScript technologies which will form the cornerstone of many applications today and far into the future need to be selected. Two technologies which fit this requirement are Angular and Redux. Angular is a framework, and Redux is a library, but when combined, they provide a powerful approach for solving many of the problems associated with the building of web applications and cross-platform user interfaces in general.

Angular is a massive user interface framework. It is a highly opinionated and comprehensive solution to many of the challenges of constructing modern user interfaces, particularly within a web browser.… Read more

, , , , ,