When you remove a Windows Azure virtual machine, you are not actually removing everything. I hear you saying "What!!!"? Let's dive in then
As each VM is kept under a cloud service, that cloud service is one of those things that remain after you remove your VM. Other thing is the disk (or disks, depends on your case) which is attached to your VM. If you didn't attach any data disks, at least your OS disk will remain inside your storage account even if you remove your VM. However, you cannot go and directly delete that VHD file just like a typical blob because there is a lease on that blob as it's still viewed as one of your registered disks.
Let's look at a case of mine on removing a Windows Azure VM. Yesterday, I created two VMs for demonstration purposes on a presentation and after the presentation, I removed those VMs by running "Remove-AzureVM" PowerShell command. So far, so good. When I go to the portal, I don't see those VMs as expected and I don't see any cloud services.
If you create a VM, the new portal is not showing that you have a cloud service but it implicitly creates one for you under the covers. As soon as you attach another VM to that cloud service, the cloud service shows up on the new portal as well. In either of these cases, the generated cloud service is completely visible to you through the REST management API. So, you can view them through PowerShell Cmdlets.
Let's run "Get-AzureService" PowerShell command to see my cloud services:
These are the generated cloud services which belong to my removed VMs. As far as I know, these cloud services won't cost me anything as they contain no deployments but it would be nice to remove them as I don't need them.
I got rid of the unnecessary cloud services. The next and final step of this cleaning is to remove the OS disks I have. This's actually more important because disk VHD files are stored inside the Windows Azure storage as blobs and each OS disk is approx. 127GB in size. So, I will pay for them as long as I keep them. Through new Windows Azure Storage PowerShell Cmdlets, I can view my VHD container to see which VHD files I have:
As you can see, I have two unnecessary VHD files which remained after my VM removal. At this stage, you might think directly deleting these blobs but as mentioned before, it will fail if we try to do that.
The error message I got is very descriptive actually: There is currently a lease on the blob and no lease ID was specified in the request. Let's run another PowerShell command to see which disks I have registered:
I have those two blobs registered as my disks and this prevents me from directly deleting them which is perfectly reasonable. To prove that this is actually the case, I will view the HTTP headers of one of those disks through CloudBerry Explorer for Azure Blob Storage:
You can see that "x-ms-lease-status" header is set to "locked" which states that there is a lease on the blob. Let's remove the "IstBootcampDemoTugberk-IstBootcampVM1-2013-4-27-132" disk from my registered disks:
Now, let's look at the HTTP headers of the blob again:
The lease is now taken out and it's now possible to delete the blob:
However, you can delete the disk from your registered disks list and the storage container in one go by running "Remove-AzureDisk" PowerShell Cmdlet with "DeleteVHD" switch:
The VHD file is completely gone. I hope the post was helpful
Managing your Windows Azure services is super easy with the various management options and my favorite among these options is Windows Azure PowerShell Cmdlets. It's very well-documented and if you know PowerShell enough, Windows Azure PowerShell Cmdlets are really easy to grasp. In this post I would like to give a few details about this management option and hopefully, it'll give you a head start.
Install it and get going
Installation of the Windows Azure PowerShell Cmdlets is very easy. It's also well-documented. You can reach the download link from the "Downloads" section on Windows Azure web site. From there, all you need to do is follow the instructions to install the Cmdlets through Web Platform Installer.
After the installation, we can view that we have the Windows Azure PowerShell Cmdlets installed on our system by running "Get-Module -ListAvailable" command:
To get you started using Cmdlets, you can see the "Get Started with Windows Azure Cmdlets" article which explains how you will set up the trust between your machine and your Windows Azure account. However, I will cover some steps here as well.
First thing you need to do is download your publish settings file. There is a handy cmdlet to do this for you: Get-AzurePublishSettingsFile. By running this command, it will go to your account and create a management certificate for your account and download the necessary publish settings file.
Next step is to import this publish settings file through another handy cmdlet: Import-AzurePublishSettingsFile <publishsettings-file-path>. This command is actually setting up lots of stuff on your machine.
- Under "%appdata%\Windows Azure Powershell", it creates necessary configuration files for the cmdlets to get the authentication information.
- These configuration files don't actually contain certificate information on its own; they just hold the thumbprint of our management certificate and your subscription id.
- Actual certificate is imported inside your certificate store. You can view the installed certificate by running "dir Cert:\CurrentUser\My" command.
Now you are ready to go. Run "Get-AzureSubscription" command to see your subscription details and you will see that it's set as your default subscription. So, from now on, you don't need to do anything with your subscription. You can just run the commands without worrying about your credentials (of course, this maybe a good or bad thing; depends on your situation). For example, I ran the Get-AzureVM command to view my VMs:
So, where is my stuff?
We installed the stuff and we just saw that it's working. So, where did all the stuff go and how does this thing even work? Well, if you know PowerShell, you also know that modules are stored under specific folders. You can view these folders by running the '$env:PSModulePath.split(';')' command:
Notice that there is a path for Windows Azure PowerShell Cmdlets, too. Without knowing this stuff, we could also view the module definition and get to its location from there:
Get-Module -ListAvailable -Name Azure
"C:\Program Files (x86)\Microsoft SDKs\Windows Azure\PowerShell\Azure" directory is where you will find the real meat:
On the other hand, when we imported the publish settings, it puts a few stuff about my subscription under "%appdata%\Windows Azure Powershell". The certificate is also installed under my certificate store as mentioned before.
When you start managing your Windows Azure services through PowerShell Cmdlets, you have your Windows Azure account information and management certificate information at various places on your computer. Even if you uninstall your Windows Azure PowerShell Cmdlets from your machine, you are not basically cleaning up everything. Let's start by uninstalling the Cmdlets from your computer.
Simply go to Control Panel > Programs > Programs and Features and find the installed program named as Windows Azure PowerShell and uninstall it. You will be done.
Next step is to go to "%appdata%\Windows Azure Powershell" directory and delete the folder completely. One more step to go now: delete your certificate. Find out what the thumbprint of your certificate is:
Then, run the Remove-Item command to remove the certificate:
Remove-Item Cert:\CurrentUser\My\507DAAF6F285C4A72A45909ACCEE552B4E2AE916 –DeleteKey
You are all done uninstalling Windows Azure PowerShell Cmdlets. Remember, Windows Azure is powerful but it's more powerful when you manage it through PowerShell
A few days ago, I presented on a webcast about ASP.NET SignalR and real-time web application scenarios in Turkish and it went pretty great I think. I also managed to record the webcast successfully and put it on Vimeo.
Hope you'll like it
Global Windows Azure Bootcamp will be happening on the 27th of April, 2013 all over the World and Istanbul will be also hosting one of these events. Global Windows Azure Bootcamp Istanbul will be held at Microsoft Istanbul office and the registration is open. You can register the event through Eventbrite.
Within the Microsoft Web Camps Spring 2013 Tour, Web Camp Istanbul was held at Microsoft Istanbul office and we had such an incredible, enjoyable event. During the day, Jon Galloway, Umit Sunar and myself presented several topics including Windows Azure, ASP.NET MVC, ASP.NET Web API and ASP.NET SignalR.
During the day, I helped Jon by trying to be the dummy guy during his ASP.NET MVC presentation. I also presented on ASP.NET Web API and ASP.NET SignalR where I showed a few sample applications. You could find the source code for those samples on my GitHub repository: https://github.com/tugberkugurlu/IstanbulWebCamps201304.
You can also find the slides for the ASP.NET Web API session: ASP.NET Web API Intro - Microsoft Web Camp, Istanbul. Here are also some links for the stuff that I have mentioned during the sessions.
- Building Real-time Web Apps with ASP.NET SignalR
- ASP.NET SignalR Wiki
- TweetMapR Source Code (Including the Windows 8 Sample)
- SignalR Samples Repository
- Brady Gaster's SignalR Samples
- JabbR: An IRC application built with SignalR (Source code is also available)
- ShootR: An awesome game built with SignalR + HTML5 features (Source code is also available)
- IIS Configuration for High Number of Concurrent Requests for SignalR Applications
ASP.NET Web API
- Building Services for Any Client with ASP.NET Web API
- ASP.NET Web API Tutorials
- ASP.NET Web API Samples
- Contact Manager - An ASP.NET Web API Sample Application (Including a Windows 8 Client)
- ASP.NET Web API Book (You can get the alpha version of Pro ASP.NET Web API book on Apress today)
I would like to thank Jon Galloway for coming to Istanbul for this event and allowing us to have such a fun day. I personally really enjoyed the whole event and also the small Istanbul tour I had with Jon I also would like to thank Brady Gaster as he's one of the people who made this event happen. I'm hoping that we will keep seeing these types of web events in Istanbul more
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