Hello, I've got a similar question about cache-manager and the presence of a > shared filesystem for instances images. > I'm currently reading the source code in order to find out how this is > managed but before I would be curious how you achieve this on production > servers. > > For example images not used by compute node A will probably be cleaned on > the shared FS despite the fact that compute B use it, that's the main > problem. >
This used to be a problem, but AFAIK it should not happen any more. If you're noticing it happening, please raise a flag. > How do you handle _base guys ? > We configure Nova to not have instances rely on _base files. We found it to be too dangerous of a single point of failure. For example, we ran into the scenario you described a few years ago before it was fixed. Bugs are one thing, but there are a lot of other ways a _base file can become corrupt or removed. Even if those scenarios are rare, the results are damaging enough for us to totally forgo reliance of _base files. Padraig Brady has an awesome article that details the many ways you can configure _base and instance files: http://www.pixelbeat.org/docs/openstack_libvirt_images/ I'm looping -operators into this thread for input on further ways to handle _base. You might also be able to find some other methods by searching the -operators mailing list archive. Thanks, Joe
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