[Bug 1413293] Re: Unable to start instances, empty /etc/machine-id file.

[Daniel Watkins]

This problem (should) disappear with systemd; it takes care of
populating /etc/machine-id on first boot, though it does need the file
to exist and be empty[0].

So we should do one (or more) of:
 - teach nova that an empty /etc/machine-id is equivalent to a missing one,
 - introduce an Upstart job which will populate /etc/machine-id on boot, or
 - wait.


[0]  systemd needs /etc/machine-id to exist if /etc is read-only, so it can mount (a temporary) /run/machine-id over it. Once /etc becomes writable, the temporary file is made persistent.

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Title:
  Unable to start instances, empty /etc/machine-id file.

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