# Hypervisor OS's

**URL:** <https://forum.opennebula.io/t/hypervisor-oss/5577>\
**Category:** Product Support\
**Created:** [January 18, 2018, 4:09pm UTC](https://forum.opennebula.io/t/hypervisor-oss/5577 "2018-01-18T16:09:53Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![bpsRobert](https://avatars.discourse-cdn.com/v4/letter/b/df788c/32.png) [@bpsRobert](https://forum.opennebula.io/u/bpsRobert)\
**Post date:** [January 18, 2018, 4:09pm UTC](https://forum.opennebula.io/t/hypervisor-oss/5577/1 "2018-01-18T16:09:53Z")

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Hello:

I am adding additional hypervisors to our ON cluster… currently utilizing Debian 9 for compute nodes, however, is it possible to add additional compute nodes that are running CentOS7? I am not sure if the hypervisor OS’s need to match the front-end OS (Debian 9 also), or not.

Thanks!

-Robert

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**Author:** ![wusel](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.opennebula.io/wusel/32/5076_2.png) [@wusel](https://forum.opennebula.io/u/wusel)\
**Post date:** [January 18, 2018, 4:36pm UTC](https://forum.opennebula.io/t/hypervisor-oss/5577/2 "2018-01-18T16:36:49Z")

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Shouldn’t be an issue, I’m using Ubuntu 14.04 LTS boxes together with 16.04 LTS boxes myself; simply ensure that your shared storage setup works (i. e. UID/GID of oneadmin user is same on Debian 9 and CentOS 7) and your networking setup is sound.

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**Author:** ![bpsRobert](https://avatars.discourse-cdn.com/v4/letter/b/df788c/32.png) [@bpsRobert](https://forum.opennebula.io/u/bpsRobert)\
**Post date:** [January 18, 2018, 4:44pm UTC](https://forum.opennebula.io/t/hypervisor-oss/5577/3 "2018-01-18T16:44:57Z")

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Hmm,  
So I figured i’d give it a shot, mixing operating systems in the same cluster…  
I’ve deployed a CentOS7 compute node, and added it to the existing cluster containing Debian 9 compute nodes. Everything seemed to fine until i tried to boot up a VM that i migrated over to it… with the following error:

Thu Jan 18 11:01:44 2018 [Z0][VMM][I]: error: Failed to create domain from /var/lib/one//datastores/0/668/deployment.2  
Thu Jan 18 11:01:44 2018 [Z0][VMM][I]: error: Cannot check QEMU binary /usr/bin/qemu-system-x86\_64: No such file or directory

The file /usr/bin/qemu-system-x86\_64 DOES exist on the Debian 9 compute nodes, but does not exist on the CentOS7 compute node.

I think you’re setup of just different Ubuntu versions, is close enough on the OS level that file locations are all still the same, and probably why you’re not seeing a problem.

I wonder if anyone has been able to mix completely different OS flavors as compute nodes…

-Robert