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Re: maintaining many Xen VMs
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My (NetBSD) DomUs are going to be mostly identical. I was
thinking of
having a shared, read-only /usr and separate /var. I probably need
separate roots, if only to have separate /etc/rc.conf files. /usr
will be
a real partition, probably shared with the Dom0. The Dom0 would
also have
a separate partition that held the vnds for the DomUs.
I have a very similar situation, except in my case I need to be able
to do local installs of software in /usr, thereby precluding sharing
all of /usr.
Another option to keep in mind is 'vfs.generic.magiclinks=1',
enabling system-specific copies of system config files. After working
with a Tru64 cluster at work, I can see lots of practical uses. Eg.
I'm using it for system-specific .screenrc in an NFS mounted home
directory:
Wow. Very interesting. But my 3.0-STABLE systems don't seem to have
any magic symlinks and googling a bit doesn't give much information
either. Is this integrated in -current (which I don't have a system
running right now) or is hidden elsewhere?
Another option that I'm considering is whether I can do anything
useful with union mounts to keep down the size of the images for the
DomUs (i.e. mounting /usr via NFS from Dom0 and then mounting a
smaller vnd on top of that).
Anyone tried that?
Johan
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