WilliamLam.com

Uniquely identifying VMs in vSphere Part 3: Enhanced Linked Mode & Cross VC-vMotion

by // 7 Comments

Back in 2012, I had published two articles which provides details and guidance on how to uniquely identify a Virtual Machine for both a vSphere and/or vCloud Director environment. The primary use case for this information was for customers or partners who have developed their own provisioning solution which requires them to track their VM assets throughout their lifecycle, usually in some sort of configuration management database (CMDB).

Although these articles are almost 5 years old, the content is still very relevant today and I still continue to reference them both with customers, partners and even some of our internal R&D folks. Most recently, I had a question about whether the guidance in these article were still applicable or whether they would be impacted by some of the new VMware technologies and capabilities that had been introduced since writing those articles such as Enhanced Linked Mode (ELM) and Cross vCenter vMotion (xVC-vMotion).

[Read more...]

vSphere Content Library PowerCLI community module

by // 27 Comments

I was recently doing some work with the vSphere Content Library and I needed to extract some information using the Content Library API. I was hoping there were a few out of the box PowerCLI cmdlets but to my surprise, there was only one cmdlet called Get-ContentLibraryItem which did not get into the level of details that I was looking for, which was on a per-file level rather than item-level. I had also search the web to see if anyone had built any functions and although a few existed, none that did the very basics which was retrieving all libraries, library items and library item files.

UPDATE (05/05/19) - Updated module with a new function for creating a subscribed Content Library, below is an example:

New-SubscribedContentLibrary -LibraryName NestedESXi -DatastoreName vsanDatastore -SubscriptionURL https://download3.vmware.com/software/vmw-tools/lib.json -SubscriptionThumbprint "7a:c4:08:2d:d3:55:56:af:9f:26:43:65:d0:31:99:0b:d2:f3:d8:69" -OnDemand

UPDATE (11/14/17) - I have recently updated the Content Library module to enhance the Get-ContentLibrary function and added several additional functions listed below

  • Set-ContentLibrary
  • New-ExtReplicatedContentLibrary
  • Remove-SubscribedContentLibrary
  • New-LocalContentLibrary
  • Remove-LocalContentLibrary
  • Copy-ContentLibrary

Not having worked with the Content Library APIs before, I figure this would be a good learning opportunity and created a PowerCLI module called ContentLibrary.psm1 which contains the following functions:

  • Get-ContentLibrary
  • Get-ContentLibraryItems
  • Get-ContentLibraryItemFiles

Before you can make use of these functions, make sure to connect to the CIS endpoint of your vCenter Server using the Connect-CisServer cmdlet.

Here is a screenshot of the vSphere Web Client showing all available Content Libraries:


Here is an example of retrieving the same information using the following command:

Get-ContentLibrary


Note: You also have the ability to filter for the name of a specific Content Library by using the -LibraryName parameter

Here is a screenshot of the vSphere Web Client showing the individual Items within a Content Library:


Here is an example of retrieving the same information using the following command:

Get-ContentLibraryItems -LibraryName Test


Note: You also have the ability to filter for the name of a specific Content Library Item by using the -LibraryItemName parameter

Although the granularity when using the vSphere Web Client is at a Content Library Item, using the Content Library API, you can get additional information on the Item itself which is then composed of a set of files. The following command will allow you to retrieve all Files or you can use -LibraryItemName parameter to filter on a specific Item.

Get-ContentLibraryItemFiles -LibraryName Test -LibraryItemName TinyVM

Using vSphere Guest Operations API on macOS Guests? 

by // 2 Comments

I have written a number of articles exploring the usage and some of the cool tricks that the vSphere Guest Operations (GuestOps) feature provides which you can be found here, here, here and here. I have been a huge fan and supporter of GuestOps since the early days where it was formally known as the VIX API. Having used GuestOps across many different GuestOS types including Nested ESXi, I have to admit, I had never tried it against an Apple macOS guests. I recently had a customer reach out who was looking to use the GuestOps API via PowerCLI (Invoke-VMScript) to automate updates against his guestOS templates that span across Windows, Linux and macOS (from 10.7 to latest). The customer was able to get all guestOSes working except for macOS.

Since I had never tried this before, I spun up my Apple Mac Mini which happen to have a macOS 10.11 (El Capitan) guests running. I tried using the vSphere API GuestOps directly to see if this was a PowerCLI and/or API issue. I too ran into issues and after enabling VMware Tools debugging on the guests (which you can find more details below), I found that it hit the following error:

[Jun 28 06:35:42.805] [   debug] [vix] >VixToolsImpersonateUser
[Jun 28 06:35:42.925] [ warning] [vmsvc] Failed to set gid for user root

Reaching out to Engineering regarding the problem, I came to learn that this particular issue was due to a syscall change made by Apple starting with macOS 10.10.3 and newer. Although the change was a positive thing from a security standpoint, it did break the GuestOps functionality. The good news was that this was already resolved with VMware Tools 10.1 or later. When I had initially provisioned the macOS guests, the latest VMware Tools at the time was 9.10.5. After I applied the latest version which is currently 10.1.7, the issue went away and I was able to successfully use the GuestOps API on my macOS guests.

Below are examples of running the system_profiler SPSoftwareDataType command using both the Invoke-VMScript cmdlet as well as the vSphere API and PowerCLI to consume the GuestOps APIs. Both approaches delivers the exact same outcome, the one benefit of using Invoke-VMScript is that if you want to easily return output from a given command, the cmdlet already does the heavy lifting. If you notice in the native vSphere API case, you do not get output but rather just the PID ID. If you want to return the output, you need to first save it into a file and then download the file to your client system, which may not be ideal for interactive usage but it all depends on your use case.

[Read more...]