Can't restart stopped VMs; unclear error message
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I have an XCP-NG 8.3.0 installation, on just a single host, that has been extremely stable for some time, usually running 5–6 VMs. I needed to restart one VM to update some packages, and it shut down cleanly but did not restart. When I tried to do it manually, I got:
[19:38 xcpng2 ~]# xe vm-start uuid=[FOO] The server failed to handle your request, due to an internal error. The given message may give details useful for debugging the problem. message: xenopsd internal error: Unix.Unix_error(Unix.ENOENT, "open", "/dev/net/tun")Subsequently, it seems that another VM stopped on its own, and trying to restart that gives the same message. I tried to create a new VM out of curiosity, and that also won't start, with the same message.
Meanwhile there are three existing VMs that are running just fine; two of them are very active and are dealing with a lot of load and network traffic without a problem. I'd prefer not to restart the host, since I don't want to interrupt these VMs just for the hope that a power-cycle will do anything.
How can I evaluate this problem? Searching for this error message hasn't led me to anything useful.
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