Updating packages in Jails

Adam Vande More amvandemore at gmail.com
Mon Feb 8 21:27:44 UTC 2010

On Mon, Feb 8, 2010 at 3:15 PM, Jason <jhelfman at e-e.com> wrote:

> Use this as a starting point
>> http://www.freebsd.org/doc/handbook/jails.html
>> Anyways, host and jail need to run the exact same kernel.  Normally I'll
>> build my kernel and install it into the base as well as each individual
>> jail
>> so everything is consistent.
> Why do they need to run the exact same kernel? I didn't see that anywhere
> in
> the document, unless I missed it.
> thanks

They aren't a full form of visualization in terms of having a hypervisor, as
it is dependent the system calls coming from a jail being the same calls
that are present in the host kernel.  Mismatched kernel version could break
that mapping.  Which is also why jails are a faster form of virtualization
because all the call mappings are 1:1.

At least that's my understanding.

Adam Vande More

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