Setting DNS for Windows servers is straightforward using PowerShell. Utilizing Get-WMIObject Win32_NetworkAdapterConfiguration against a list of servers from a text file in a loop is the best way to handle a bulk dns change to your servers. I was prompted to share my PowerShell script after reading a post from Mike Tabor on his blog at MikeTabor.com titled How to update VMware Windows VM’s DNS using PowerCLI .
Mike Tabor goes through his process of taking an old script he found and updated it to more modern PowerCLI script. His script is very useful in that you can change the IP address in addition to setting dns for Windows servers in your VMware environment. He credits Jase McCarty who created the original script and helped Mike update it. I encourage you to go check it out.
Here is my purely PowerShell script that I have been using for the past few years to make dns changes. It does not update IP addresses but does allow for changes to dns settings. Using a foreach loop with all the necessary dns settings through Get-WMIObject makes for a simplified script. But just because it is simplified doesn’t mean you can’t do mass amounts of damage to your environment. I always test against a few individual test servers just to make sure before I send this against all my Windows servers.
It does work on both physical and virtual Windows computers. Unfortunately we still have a few Windows physical servers so I will still utilize this script when setting dns for Windows servers. However, when I need to make a mass IP and dns change to virtual machine servers I will utilize Mike Tabor’s script. I expect that soon my environment will not have any physical Windows servers. All virtual is the goal!
Caution: Like all code you download from the internet,
please understand and modify the code accordingly to prevent unforeseen
production problems. Also known as career-altering events.
I’ve been wanting to create a PowerCli script to automatically configure a scratch file location if one did not exist. This script would come in handy when moving to a new lun for the scratch location. After some quick google fu I came across a great script that met my requirements plus a little more.
In addition to creating the needed scratch file location this script indicates if it is already created and if the vmhost needs a reboot to complete the process. A csv file is created with a list of all the hosts that need a reboot. I made two small changes to the script. I added the cluster name to the exported name of the csv file. A disconnect-viserver command was added to the end of the script.
Feel free to comment and give suggestions on how to improve this script or any others I have shared. While you’re here check out my Schannel Set-Crypto PowerCLi Script Feedback is always appreciated.
As usual VMware magnanimously offers to provide extended support for a ‘small’ purchase price.
“In the event you are unable to upgrade before the End of General Support (EOGS) and are active on Support and Subscription, you have the option to purchase extended support in one year increments for up to two years beyond the EOGS date. Visit VMware Extended Support for more information.”
If support is just a best-case scenario and you can stomach going it alone (with Google searching) then Technical Guidance with be available for another year until September 19, 2020.
“Technical Guidance for vSphere 5.5 is available until September 19, 2020 primarily through the self-help portal. During the Technical Guidance phase, VMware does not offer new hardware support, server/client/guest OS updates, new security patches or bug fixes unless otherwise noted. For more information, visit VMware Lifecycle Support Phases.”
Technical Support is always a good option to have and for all of you knowledge seekers it is a great way to learn the nuances of VMware products. See my previous post Tech Support is Not a Dirty Word for my take.
Amazon Web Services and VMware have finally launched their much anticipated VMware Cloud on Amazon Web Services. What does this mean for traditional VMware shops? In my opinion it means that the ease of exploring the cloud for enterprises has become much more likely to happen. In other words this will accelerate the move to the cloud for vSphere deployments everywhere.
VMware Cloud on AWS Key feature
The ability to manage applications across your private-on-premises cloud and AWS becomes seamless. The ability to see your Amazon vSphere clusters in your vCenter just like any other cluster is awesome. This is what I have been clamoring for and I can’t wait to try this.
Hurdles to overcome using VMware Cloud on AWS
I hope that this will also mean that I can go out and purchase Amazon Web Services through VMware which is already a trusted partner for our enterprise. At my enterprise we have been exploring the possibility of moving some services to the cloud but we are running into issues with our legal team and the Amazon Web Services contract. Amazon has been very resistant to changing any of the legal language that our lawyers are insisting upon. The result has been that we are stuck in limbo. I hope to explore this further in the coming months and will update here what I find.
I had the opportunity a few months ago to take the VMware vSphere: Optimize and Scale [6.5] class. The class was held at MicroTek Atlanta Training. The facility was very nice and not far from the hotel I stayed at for the week. The instructor was Brian Perry who is the Managing Partner with VUmbrella. He is a member of a very exclusive club VMworld Alumni Elite. Alumni Elite members (21) have attended every VMworld event and now have been given a free pass for life as long as they continue to go to each VMworld event and do not miss one.
The course is broken down into 11 sections. (You can get the outline from the course link above in the first paragraph) Going into this class after reading the outline I was worried that there wouldn’t be enough new material to justify taking this class in the first place. For experienced VMware admins this class is great because it allowed me to test drive many of the new feature of vSphere 6.5 before implementing in my lab. In my case, whether intentional or not, I had been exposed to many of the more advanced parts of this class through VMware Support requests. (Just a little training tidbit: If you can’t get your organization to pay for advanced VMware training, use VMware Support to get educated when you invariably have issues in your environment. Most of the techs are more than happy to explain to you the why behind the what. The other excellent resource is VMware Hands-On Labs which is free to everyone. If you need some free resources please refer to my previous article Top 13 Free VMware Training Resources)
Out of the 11 different sections the 4 sections on Optimization and the vCenter Server Availability and Performance were the best for me. The Optimization sections cover CPU, Memory, Storage, and Network. They especially get into the use of esxtop to troubleshoot and analyze your environment. Setting up vCenter HA in the class was a great experience and within a couple of weeks after attending this class it was setup in my production environment. Great Stuff!
The bottom line is that this class was great especially the instructor Brian Perry. After talking with Brian I think I found my next VMware training class. VMware vSphere: Troubleshooting Workshop . His description was that the instructor runs scripts to break various parts of vSphere and you have to fix it. What better way to learn is there?