port-xen: Re: maintaining many Xen VMs

Subject: Re: maintaining many Xen VMs
To: None <stix@stix.id.au>
From: Johan Ihren <johani@johani.org>
List: port-xen
Date: 10/21/2006 22:38:35

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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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