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On 2016-12-25 13:28, @LeeteqXV (Twitter) wrote:
> For the record; my shift from Fedora-23 to Fedora-24 went
> painlessly/successfully, thanks to the existing, good documentation.
> 
> Only thing I had to figure out logically (by experience, luckily, or I
> would have started wasting time unnecessarily) was that I should try to
> reboot when sys-* failed to start afterwards, which then worked, and all
> was fine.
> 
> *Suggested documentation addition:**
> *
> 
> So I think the main docs page should have a top-level link both in the
> "Upgrade guides" section to "updating template association for
> sys-net/sys-firewall" and also from the existing Fedora 23-to-24 doc
> page, especially for some time now that Fedora-23 is EoL/End-of-Life. As
> this is not specific to any particular version number, it should be easy
> to find regardless of which upgrade one is performing, therefore I think
> it should have its own page and be linked from the Upgrades section.
> 
> In particular, it should be easy to spot the information about the need
> to reboot the computer immediately after changing the template
> association for sys-firewall and sys-net, as that is not entirely
> obvious for everyone.
> 
> The existing page does not mention sys-firewall/sys-net , neither does
> it link to any other page that deals with that:
> 
> https://www.qubes-os.org/doc/template/fedora/upgrade-23-to-24/
> 
> And, if someone is coming to those pages AFTER having bravely tried to
> update the system without searching (sufficiently?) through all the docs
> (...), they just might be searching for this error message: "cannot
> execute qrexec-deamon", which also should offer a hit to this suggested
> new page among the top search results...
> 
> (I seached briefly myself, but did not find a page describing this
> template switch for sys-net/sys-firewall .)
> 
> In case there is such a page that I did not find, here is some info that
> it 'should' include:
> 
> ************************
> *Doc text suggestion:*
> 
> Disable both sys-firewall and sys-net so that only dom0 is running, then
> change the template association to the new template in each one's VM
> settings. Restart the computer.
> 
> PS. If you do not restart the computer right afterwards, but instead try
> to start either one of them, you may get this error:
> 
> "Error starting VM 'sys-firewall'" / "Error starting VM 'sys-net'":
> "cannot execute qrexec-deamon"
> 
> (This may also be the error you get if running the commands 'qvm-start
> sys-firewall' / 'qvm-start sys-net' in this scenario)
> 
> ****************
> 
> Happy xmas everyone :-)
> 
> @LeeteqXV
> 

Are you certain that this isn't just a bug (perhaps an uncommon one)? If
it's a bug and not intended design, we should file a bug report rather
than (just) documenting the workaround. I don't recall having to reboot
the host machine after changing the TemplateVM on which sys-net and/or
sys-firewall is based, even as part of upgrading a TemplateVM from
Fedora 23 to Fedora 24. The qrexec error is a common error message,
often caused by a lack of memory, but for other reasons, too.

In particular, it sounds a lot like this issue (which we can potentially
reopen):

https://github.com/QubesOS/qubes-issues/issues/1724

- -- 
Andrew David Wong (Axon)
Community Manager, Qubes OS
https://www.qubes-os.org
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