This morning while beginning the process to migrate to a new ssd the domain.cfg file on the flash drive for Unraid became corrupt.

 

I did a quick google search and couldn't find anything about fixing the issue. Is this something that can be replaced with the file from the install package or am I SOL here?

The domain.cfg file is simply the settings from Settings - VM Settings.  Whatever you change in there will rewrite the domain.cfg file.

It isn't a very complex file. Here's mine for reference.

SERVICE="enable"
DEBUG="no"
DOMAINDIR="/mnt/user/domains/"
MEDIADIR="/mnt/user/isos/"
VIRTIOISO="/mnt/user/isos/virtio-win-0.1.160-1.iso"
BRNAME="br0"
VMSTORAGEMODE="auto"
IMAGE_FILE="/mnt/user/system/libvirt/libvirt.img"
IMAGE_SIZE="1"
DISKDIR="/mnt/"
TIMEOUT="60"
HOSTSHUTDOWN="shutdown"

It essentially reflects the content of the Settings -> VM Manager page in Advanced view:

 

Just now, Squid said:

The domain.cfg file is simply the settings from Settings - VM Settings.  Whatever you change in there will rewrite the domain.cfg file.

Thank you, that explains when it got corrupt it was just after I shut down the VMs.

 

If I remove the corrupt file will Unraid write a new one when I change the VM Settings?

5 minutes ago, jdmhammer said:

If I remove the corrupt file will Unraid write a new one when I change the VM Settings?

I expect it would do but you're in a good position to test the theory! It won't make things worse.

4 minutes ago, John_M said:

I expect it would do but you're in a good position to test the theory! It won't make things worse.

Fair point, I'll report back.

Success, removed the corrupt file and saved the VM config again.

That's good to know.