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Subject: Re: Running FreeBSD 4.9 Jails on a FreeBSD 5.2.1 system
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Kung Foo Ham[p]?ster wrote:
> I'm looking at upgrading my main system from FreeBSD RELENG_4 to RELENG_5_2.
> I'll probably start with a clean sate for the system for that transition.
> 
> I have a few users who run their own systems on jails on my machine...
> 
> My question is:
> 
> When I install FreeBSD 5 on my system can I run those FreeBSD 4 Jails on it and
> then upgrade them individually without much pressure.
> 
> I want to have as minimal down time upgrading my system.
> I'm hoping that I can upgrade my system for a day and then upgrade the jails
> individually at my leisure.
> 
> Can this be done?
> 
> -Adam
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> 

AFAIK you can have different builds on main system and jails, though it 
is not good idea (it is always better to have system "synchronized" with 
kernel). So you probably can do that, but you may expect some problems...