Re: Cron jobs not working with virsh commands
On Fri, May 26, 2023 at 12:30:18PM +0200, Jeff Brown wrote:
Recently, while testing backup scripts, I happened to notice that
'virsh
snaphot-create-as . . .' has been failing with 'error: failed to get domain
'$DOMAIN'' when run through crontab. So I've been unwittingly backing up
the
live, running, QCOW2 images for quite some time because scripts which run
fine when testing from CLI, fail to work as expected when run as a cron job.
After much searching, I stumbled upon a related issue with the (obvious?)
simple solution almost hidden in the answers. You have to explicitly connect
to the local server with, e.g.:
virsh -c qemu:///system snapshot-create-as . . .
Humble apologies if I missed something I should have been aware of, but I
just thought it worthwhile mentioning here for anyone else searching for an
answer in the archives.
If you don't specify a URI, then libvirt attempts to guess one based
on what's installed, what's running and what user you're running the
command as.
Assuming libvirt qemu driver is installed & running, the latter point
will be where you hit the problem
Running as 'root' libvirt defaults to qemu:///system.
Running as any non-root account, it defaults to qemu:///session
Some more info here:
https://libvirt.org/uri.html#default-uri-choice
https://libvirt.org/drvqemu.html#connections-to-qemu-driver
With regards,
Daniel
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