Change operating system on a reserved server in Azure

Per Sigurdsson 0 Reputation points


We got some servers that are in reserved term.

They are running CentOs and now we need to change it to RedHat Linux.

Isit possible in some way?


Azure Virtual Machines
Azure Virtual Machines
An Azure service that is used to provision Windows and Linux virtual machines.
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  1. Konstantinos Passadis 17,286 Reputation points

    Hello @Per Sigurdsson

    If your Reservation is a VM type you can choose your OS .

    The Reserved Instance has to do with the Size (SKU) of the machine

    But if you have a Software Reservation then please clarify


    I hope this helps!

    Kindly mark the answer as Accepted and Upvote in case it helped!


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  2. kobulloc-MSFT 23,336 Reputation points Microsoft Employee

    Hello, @Per Sigurdsson !

    Can I perform an in-place upgrade on my VM?

    It is possible to perform an in-place upgrade on your VM for Windows Server (no instructions for Linux), however this guidance is in the process of being updated as there can be long term issues with this approach. The new guidance is to create a new deployment for your VM with your new desired OS if you want to change the operating system.

    It is recommended that you separate your data from your OS as much as possible using a separate data disk for your VM. In doing this, the process of changing your VM OS is much more streamlined.

    I hope this has been helpful! Your feedback is important so please take a moment to accept answers.

    If you still have questions, please let us know what is needed in the comments so the question can be answered. Thank you for helping to improve Microsoft Q&A!

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