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Get NodeAuthorization working in Kubernetes with acs-engine

Node Authorization in k8s I'm starting to get into the container world and I'm loving it. Recently we helped a client build out and deploy a micro-services application in Kubernetes. We created the cluster in Azure using the open source project acs-engine. After we got the cluster set up, our client asked for some updates to the cluster for security reasons. One of those updates was to enable Node Authorization.

What is Node Authorization? Node Authorization locks down each Node in the cluster to only be able to do actions on itself. If this is not turned on, its possible for a malicious pod to take actions on any other node, including reading secrets, deleting pods, etc. There is an excellent post by Antoine Cotten that explains this very well ( as well as RBAC, which is a different subject altogether).
How do I set it up? Based on the current documentation, it looks like setting up Node Authorization should be easy. Basically follow these steps Turn on TLS Boot StrappingEdit…
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Executing .ps1 files in a DockerFile

This week I was trying to containerize an existing java application. Part of "installing" the application  on the container required executing an PowerShell script in the container during the Image build. Based on the documentation here I thought i could add the following command to my dockerfile and it would work:

RUN install.ps1

However, when I went to build the image, it just hung on that step. I tried several other variations of the run command including:

RUN ["Powershell", ".\install.ps1"]
which resulted in the following error: '["Powershell"' is not recognized as an internal or external command,operable program or batch file.

RUN ["Powershell.exe", ".\install.ps1"] which returned the same error as above.

I was about to give up and move the PowerShell commands from the .ps1 file directly into the dockerfile itself as described here, but I had an "A HA!" moment and decided to give a simpler approach a tr…

IOT security made easy with Azure IOT Suite

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Before we get too far, its important to explain exactly what IOT security means:

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Adding a user to a SQL Azure Database

This week i had to create a few new users for a SQL Azure database. I have to do this often, but I can never remember the exact steps that need to be run.

If you've connected to a SQL Azure instance, you'll quickly see that some of the useful UI Options don't exist or work differently. For example, if you want to add a new user, you get a SQL script that just creates the user, but doesn't give them any access to the database:


In order to actually give the user access to a database, you need to switch your connection to the database you want to the user to access and run the following command:

-- Add user to the database owner role EXEC sp_addrolemember N'db_owner', N'[UserName]'
You can switch out the default schema and role to whatever fits your needs.
After all of that, the user should work, but if you try to connect from SQL Mgmt Studio, you'll get an error that the user d…

Restart-AzureWebsite: Your Azure credentials have not been set up

I recently ran into an issue when trying to restart an Azure App Service from PowerShell. The command to do it is Restart-AzureWebsite, but when I attempted to run it, I got the following error:
“Restart-AzureWebsite : Your Azure credentials have not been set up or have expired, please run Add-AzureAccount to set up your Azure credentials”
I ran the Add-AzureAccount command but I continued to get the same error.
After some digging I realized that I had more than 1 Azure subscription and the command was using the wrong one when attempting to restart the website.
I ran the following command to retrieve the subscriptions that are cached on my PC:
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Quick and easy table Audit with code first EF6 and Migrations

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I did some investigating into this and there were a few options:
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Sitefinity Blank Login Screen

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