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Old 05-17-2010, 12:23 PM
Miles Fidelman
Default bug report for xen-linux-system-2.6.26-2-xen-686 (+policy issue)

Just came across an interesting install bug, that illustrates a
potential class of gotchas to watch out for, that might want to be
addressed in the Debian Policy (more at end).

I installed xen-linux-system-2.6.26-2-xen-686 on Lenny, using
DRBD-backed disk volumes. And all worked fine when starting and
stopping VMs manually.

The thing is, that the xen installer sticks S21xendomains into
../rc<n>.d - but DRBD doesn't initialize until later (S70drbd). Hence
any virtual machines that are set for auto-start, or saved for
auto-resume, fail during boot - they're looking for boot drives that
don't yet exist.

The fix is simple, rename S21xendomains to S76xendomains (I put it after
S75hearbeat as well, since I expect there might be some interactions
there as well - that's what I'll be working on next - as you may
surmise, I'm building a failover environment).

Seems like a fix should make its way into the xen distribution, or at
least into the README.Debian. And it seems illustrative of a more
general issue of initialization inter-dependencies - which really isn't
called out in the Debian Policy section on initialization scripts.


Miles Fidelman

In theory, there is no difference between theory and practice.
In<fnord> practice, there is. .... Yogi Berra

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