Scott Hanselman

Setting up a managed container cluster with AKS and Kubernetes in the Azure Cloud running .NET Core in minutes

December 14, '17 Comments [7] Posted in Azure
Sponsored By

After building a Raspberry Pi Kubernetes Cluster, I wanted to see how quickly I could get up to speed on Kubernetes in Azure.

  • I installed the Azure CLI (Command Line Interface) in a few minutes - works on Windows, Mac or Linux.
    • I also remembered that I don't really need to install anything locally. I could just use the Azure Cloud Shell directly from within VS Code. I'd get a bash shell, Azure CLI, and automatically logged in without doing anything manual.
    • Anyway, while needlessly installing the Azure CLI locally, I read up on the Azure Container Service (AKS) here. There's walkthrough for creating an AKS Cluster here. You can actually run through the whole tutorial in the browser with an in-browser shell.
  • After logging in with "az login" I made a new resource group to hold everything with "az group create -l centralus -n aks-hanselman." It's in the centralus and it's named aks-hanselman.
  • Then I created a managed container service like this:
    C:\Users\scott\Source>az aks create -g aks-hanselman -n hanselkube --generate-ssh-keys
    / Running ...
  • This runs for a few minutes while creating, then when it's done, I can get ahold of the credentials I need with
    C:\Users\scott\Source>az aks get-credentials --resource-group aks-hanselman --name hanselkube
    Merged "hanselkube" as current context in C:\Users\scott\.kube\config
  • I can install Kubenetes CLI "kubectl" easily with "az aks install-cli"
    Then list out the nodes that are ready to go!
    C:\Users\scott\Source>kubectl get nodes
    NAME                       STATUS    ROLES     AGE       VERSION
    aks-nodepool1-13823488-0   Ready     agent     1m        v1.7.7
    aks-nodepool1-13823488-1   Ready     agent     1m        v1.7.7
    aks-nodepool1-13823488-2   Ready     agent     1m        v1.7.7

A year ago, Glenn Condron and I made a silly web app while recording a Microsoft Virtual Academy. We use it for demos and to show how even old (now over a year) containers can still be easily and reliably deployed. It's up at https://hub.docker.com/r/glennc/fancypants/.

I'll deploy it to my new Kubernetes Cluster up in Azure by making this yaml file:

apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: fancypants
spec:
replicas: 1
template:
metadata:
labels:
app: fancypants
spec:
containers:
- name: fancypants
image: glennc/fancypants:latest
ports:
- containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
name: fancypants
spec:
type: LoadBalancer
ports:
- port: 80
selector:
app: fancypants

I saved it as fancypants.yml, then run kubectl create -f fancypants.yml.

I can run kubectl proxy and then hit http://localhost:8001/api/v1/namespaces/kube-system/services/http:kubernetes-dashboard:/proxy/#!/overview?namespace=default to look at the Kubernetes Dashboard, proxyed locally, but all running in Azure.

image

When fancypants is created and deployed, then I can find out its external IP with:

C:\Users\scott\Sources>kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
fancypants LoadBalancer 10.0.116.145 52.165.232.77 80:31040/TCP 7m
kubernetes ClusterIP 10.0.0.1 <none> 443/TCP 18m

There's my IP, I hit it and boom, I've got fancypants in the managed cloud. I only have to pay for the VMs I'm using, and not for the VM that manages Kubernetes. That means the "kube-system" namespace is free, I pay for other namespaces like my "default" one.

image

Best part? When I'm done, I can just delete the resource group and take it all away. Per minute billing.

C:\Users\scott\Sources>az group delete -n aks-hanselman --yes

Super fun and just took about 30 min to install, read about, try it out, write this blog post, then delete. Try it yourself!


Sponsor: Check out JetBrains Rider: a new cross-platform .NET IDE. Edit, refactor, test and debug ASP.NET, .NET Framework, .NET Core, Xamarin or Unity applications. Learn more and download a 30-day trial!

About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

facebook twitter subscribe
About   Newsletter
Sponsored By
Hosting By
Dedicated Windows Server Hosting by SherWeb

The 2017 Christmas List of Best STEM Toys for kids

December 9, '17 Comments [17] Posted in Reviews
Sponsored By

In 2016 and 2015 I made a list of best Christmas STEM Toys for kids! If I may say so, they are still good lists today, so do check them out. Be aware I use Amazon referral links so I get a little kickback (and you support this blog!) when you use these links. I'll be using the pocket money to...wait for it...buy STEM toys for kids! So thanks in advance!

Here's a Christmas List of things that I've either personally purchased, tried for a time, or borrowed from a friend. These are great toys and products for kids of all genders and people of all ages.

Piper Computer Kit with Minecraft Raspberry Pi edition

The Piper is a little spendy at first glance, but it's EXTREMELY complete and very thoughtfully created. Sure, you can just get a Raspberry Pi and hack on it - but the Piper is not just a Pi. It's a complete kit where your little one builds their own wooden "laptop" box (more of a luggable), and then starting with just a single button, builds up the computer. The Minecraft content isn't just vanilla Microsoft. It's custom episodic content! Custom voice overs, episodes, and challenges.

What's genius about Piper, though, is how the software world interacts with the hardware. For example, at one point you're looking for treasure on a Minecraft beach. The Piper suggests you need a treasure detector, so you learn about wiring and LEDs and wire up a treasure detector LED while it's running. Then you run your Minecraft person around while the LED blinks faster to detect treasure. It's absolute genius. Definitely a favorite in our house for the 8-12 year old set.

Piper Raspberry Pi Kit

Suspend! by Melissa and Doug

Suspend is becoming the new Jenga for my kids. The game doesn't look like much if you judge a book by its cover, but it's addictive and my kids now want to buy a second one to see if they can build even higher. An excellent addition to family game night.

Suspend! by Melissa and Doug

Engino Discovering Stem: Levers, Linkages & Structures Building Kit

I love LEGO but I'm always trying new building kids. Engino is reminiscent of Technics or some of the advanced LEGO elements, but this modestly priced kit is far more focused - even suitable for incorporating into home schooling.

Engino Discovering Stem: Levers, Linkages & Structures Building Kit

Gravity Maze

I've always wanted a 3D Chess Set. Barring that, check out Gravity Maze. It's almost like a physical version of a well-designed iPad game. It included 60 challenges (levels) that you then add pieces to in order to solve. It gets harder than you'd think, fast! If you like this, also check out Circuit Maze.

818Ly6yML

Osmo Genius Kit (2017)

Osmo is an iPad add-on that takes the ingenious idea of an adapter that lets your iPad see the tabletop (via a mirror/lens) and then builds on that clever concept with a whole series of games, exercises, and core subject tests. It's best for the under 12 set - I'd say it's ideal for about 6-8 year olds.

81iVPligcyL


Sponsor: Check out JetBrains Rider: a new cross-platform .NET IDE. Edit, refactor, test and debug ASP.NET, .NET Framework, .NET Core, Xamarin or Unity applications. Learn more and download a 30-day trial!

About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

facebook twitter subscribe
About   Newsletter
Sponsored By
Hosting By
Dedicated Windows Server Hosting by SherWeb

Accelerated 3D VR, sure, but impress me with a nice ASCII progress bar or spinner

December 4, '17 Comments [13] Posted in DotNetCore
Sponsored By

I'm glad you have a 1080p 60fps accelerated graphics setup, but I'm old school. Impress me with a really nice polished ASCII progress bar or spinner!

I received two tips this week about cool .NET Core ready progress bars so I thought I'd try them out.

ShellProgressBar by Martijn Laarman

This one is super cool. It even supports child progress bars for async stuff happening in parallel! It's very easy to use. I was able to get a nice looking progress bar going in minutes.

static void Main(string[] args)
{
const int totalTicks = 100;
var options = new ProgressBarOptions
{
ForegroundColor = ConsoleColor.Yellow,
ForegroundColorDone = ConsoleColor.DarkGreen,
BackgroundColor = ConsoleColor.DarkGray,
BackgroundCharacter = '\u2593'
};
using (var pbar = new ProgressBar(totalTicks, "Initial message", options))
{
pbar.Tick(); //will advance pbar to 1 out of 10.
//we can also advance and update the progressbar text
pbar.Tick("Step 2 of 10");
TickToCompletion(pbar, totalTicks, sleep: 50);
}
}

Boom.

Cool ASCII Progress Bars in .NET Core

Be sure to check out the examples for ShellProgressBar, specifically ExampleBase.cs where he has some helper stuff like TickToCompletion() that isn't initially obvious.

Kurukuru by Mayuki Sawatari

Another nice progress system that is in active development for .NET Core (like super active...I can see they updated code an hour ago!) is called Kurukuru. This code is less about progress bars and more about spinners. It's smart about Unicode vs. non-Unicode as there's a lot of cool characters you could use in a Unicode-aware console that make for attractive spinners.

What a lovely ASCII Spinner in .NET Core!

Kurukuru is also super easy to use and integrated into your code. It also uses the "using" disposable pattern in a clever way. Wrap your work and if you throw an exception, it will show a failed spinner.

Spinner.Start("Processing...", () =>
{
Thread.Sleep(1000 * 3);

// MEMO: If you want to show as failed, throw a exception here.
// throw new Exception("Something went wrong!");
});

Spinner.Start("Stage 1...", spinner =>
{
Thread.Sleep(1000 * 3);
spinner.Text = "Stage 2...";
Thread.Sleep(1000 * 3);
spinner.Fail("Something went wrong!");
});

TIP: If your .NET Core console app wants to use an async Main (like I did) and call Kurukuru's async methods, you'll want to indicate you want to use the latest C# 7.1 features by adding this to your project's *.csproj file:

<PropertyGroup>
    <LangVersion>latest</LangVersion>
</PropertyGroup>

This allowed me to do this:

public static async Task Main(string[] args)
{
Console.WriteLine("Hello World!");
await Spinner.StartAsync("Stage 1...", async spinner =>
{
await Task.Delay(1000 * 3);
spinner.Text = "Stage 2...";
await Task.Delay(1000 * 3);
spinner.Fail("Something went wrong!");
});
}

Did I miss some? I'm sure I did. What nice ASCII progress bars and spinners make YOU happy?

And again, as with all Open Source, I encourage you to HELP OUT! I know the authors would appreciate it.


Sponsor: Check out JetBrains Rider: a new cross-platform .NET IDE. Edit, refactor, test and debug ASP.NET, .NET Framework, .NET Core, Xamarin or Unity applications. Learn more and download a 30-day trial!

About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

facebook twitter subscribe
About   Newsletter
Sponsored By
Hosting By
Dedicated Windows Server Hosting by SherWeb

Azure Cloud Shell - your own bash shell and container - right inside Visual Studio Code

December 3, '17 Comments [9] Posted in Azure
Sponsored By

Visual Studio Code has a HUGE extension library. There's also almost two dozen very nice Azure specific extensions as well as extensions for Docker, etc. If you write an Azure extension yourself, you can depend on the Azure Account Extension to handle the administrivia of the user logging into Azure and selecting their subscription. And of course, the Azure Account Extension is open source.

Here's the cool part - I think, since I just learned it. You can have the Azure Account Extension installed (again, you can install it directly or you can get it as a dependency) you also get the ability to get an Azure Cloud Shell directly inside VS Code. That means a little container spins up in the Cloud and you can get a real bash shell or a real PowerShell shell quickly. AND the Azure Cloud Shell automatically is logged in as you and already has a ton of tools pre-installed.

Here's how you do it.

VS Code Command Palette

It will pop up a message with a "copy & open" button. It'll launch a browser, then you enter a special code after logging into Azure to OAuth VS Code into your Account account.

image

At this point, open a Cloud Shell with Shift-Ctrl-P and type "Bash" or "PowerShell"...it'll autocomplete so you can type a lot less, or setup a hotkey.

Your Cloud Shell will appear along side your local terminals!

Azure Cloud Shell in VS Code

Note that there's a "clouddrive" folder mapped to your Azure Storage so you can keep stuff in there. Even though the Shell goes away in about 20 min of non-use, your stuff (scripts, whatever) is persisted.

image

There's a bunch of tools preinstalled you can use as well!

scott@Azure:~$ node --version
v6.9.4
scott@Azure:~$ dotnet --version
2.0.0
scott@Azure:~$ git --version
git version 2.7.4
scott@Azure:~$ python --version
Python 3.5.2
scott@Azure:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.2 LTS
Release: 16.04
Codename: xenial

And finally, when you type "azure" or "az" for the various Azure CLI (Command Line Interface) tools, you'll find you're already authenticated/logged into Azure, so you can create VMs, list websites, manage Kubenetes clusters, all from within VS Code. I'm still exploring, but I'm enjoying what I'm seeing.


Sponsor: Scale your Python for big data & big science with Intel® Distribution for Python. Near-native code speed. Use with NumPy, SciPy & scikit-learn. Get it Today

About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

facebook twitter subscribe
About   Newsletter
Sponsored By
Hosting By
Dedicated Windows Server Hosting by SherWeb

How to download embedded videos with F12 Tools in your browser

November 29, '17 Comments [17] Posted in Tools
Sponsored By

I got an email this week asking how to download some of my Azure Friday video podcast videos from http://friday.azure.com as well as some of the Getting Started Videos from Azure.com.

NOTE: Respect copyright and consider what you’re doing and WHY before you use this technique to download videos that may have been embedded for a reason.

I told them to download the videos with F12 tools, and they weren't clear how. I'll use an Azure Friday video for the example. Do be aware that there are a ton of ways to embed video on the web and this doesn't get around ones that REALLY don't want to be downloaded. This won't help you with Netflix, Hulu, etc.

First, I'll visit the site with the video I want in my browser. I'll use Chrome but this also works in Edge or Firefox with slightly different menus.

Then press F12 to bring up the Developer Tools pane and click Network. In Edge, click Content Type, then Media.

Download embedded videos with F12

Click the "clear" button to set up your workspace. That's the International No button there in the Network pane. Now, press Play and get ready.

Look in the Media list for something like ".mp4" or something that looks like the video you want. It'll likely have an HTTP Response in the 20x range.

Download 200

In Chrome, right click on the URL and select Copy as CURL. If you're on Windows pick cmd.exe and bash if you're on Linux/Mac.

Downloading with CURL

You'll get a crazy long command put into your clipboard. It's not all needed but it's a very convenient feature the browser provides, so it's worth using.

Get Curl: If you don't have the "curl" command you'll want to download "curl.exe" from here https://curl.haxx.se/dlwiz/ and, if you like, put it in your PATH. If you have Windows, get the free bundled curl version with installer here.

Open a terminal/command prompt - run cmd.exe on Windows - and paste in the command. If the browser you're using only gives you the URL and not the complete "curl" command, the command you're trying to build is basically curl [url] -o [outputfile.mp4]. It's best if you can get the complete command like the one Chrome provides, as it may include authentication cookies or other headers that omitting may prevent your download from working.

GOTCHA: Make sure to remove the -H "Range:" headers (if any) to ensure you get the FULL download and not just a range of bytes!

image

BEFORE you press enter, make sure you add "-o youroutputfilename.mp4." Also, if you can an error about security and certificates, you may need to add "--insecure."

Downloading a streaming video file with CURL

In the screenshot above I'm saving the file as "test.mp4" on my desktop.

There are several ways to download embedded videos, including a number of online utilities that come and go, but this technique has been very reliable for me.


Sponsor: Scale your Python for big data & big science with Intel® Distribution for Python. Near-native code speed. Use with NumPy, SciPy & scikit-learn. Get it Today

About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

facebook twitter subscribe
About   Newsletter
Sponsored By
Hosting By
Dedicated Windows Server Hosting by SherWeb

Disclaimer: The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.