On 02/02/2018 17:14, David Salvisberg wrote:

I recently switched from Debian as my Dom0 to FreeBSD to make use of ZFS
without having to rely on zfs-on-linux. The experience has been pretty good
so far, albeit a bit more limited compared to Debian obviously.

One of the things I haven't been able to figure out is /etc/xen/auto or
rather /usr/local/etc/xen/auto in FreeBSDs case. It doesn't look like Xen
on FreeBSD ships with any of the configuration options for this feature,
possibly due to lack of support for save and restore.

I don't really need save and restore but auto spawning VMs on boot would be
a nice thing to be able to do without having to write my own rc.d script or
something along those lines.

Is there a way to make use of the auto creation feature on FreeBSD Xen or
is that feature just missing entirely due to the lack of save/restore

If there is no builtin way, I'd appreciate any recommendations for writing
my own scripts to make sure that they're only being run after Xen has been
fully initialized and is ready for xl create commands.

Best Regards

David Salvisberg

Hi David,

I'm not using Xen right now and I'm afraid I can't remember - which means it can't have been an issue.

The easy way to kick of something on boot is the traditional "/etc/rc.local" script.

Automation "enthusiasts" like to complicate things and are a bit disparaging of this simple way of running whatever you want on startup. The file probably doesn't even exist on your system. So create it. The contents will look something like:

cd /usr/something/my-xen-configs
xl create somemachine.cfg
xl create someothermachine.cfg
xl create yetanothermachine.cfg
echo All done!

This assumes xl is on the search path of the environment when rc.local is run. I never assume, so I'd use the full path to "xl". Avoid unexpected results!

This is a normal shell script, so you can do more complex things like:

  for vm in `ls /usr/something/my-xen-configs` ; do xl create $vm ; done

But this is getting dangerously close to automation ;-)

Regards, Frank.

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