Strange issues while upgrading ports

[Kaya Saman]

On 11/25/2011 02:51 PM, Julian H. Stacey wrote:
> Kaya Saman wrote:
>> Hi,
>>
>> I'm running FreeBSD version 8.0 x64 edition on my server with multiple
>> jails.
> <  Detail deleted>
>
>> Can anyone help with my issues??
> 8.0 is too old, November 2009
> http://www.freebsd.org/releases/
>
> 8.0 Is not supported.
> http://www.freebsd.org/security/security.html#sup
>
> My machine ceased to crash when I moved from 8.0 to 8.2,
> I seem to recall other problems eased too.
>
> So upgrade to at least 8.1 !
>
> If you management are saying stay at `proven' 8.0 rather than 8.2,
> think again.
>
> It's well known that .0 releases can be problematic, which is I
> recall why 8.1 has extended support (even beyond 8.2), useful for
> those who don't want to keep upgrading.
>
> Yes, 9.0-RC2 is available for test for those wanting new features,
> not for you if you'r still on 8.0. One would expect less stability
> from 9.0-RC2 than 8.0.&  no more from 9.0 than 8.0, so go for 8.1
> or 8.2 then wait for 9.1 not 9.0.
>
> Cheers,
> Julian
How is the upgrade of versions done?

I'm sorry I've never done it before; from my linux experience on Debian 
at least it's a bit messy.

I found this:

http://www.freebsd.org/doc/handbook/updating-upgrading-freebsdupdate.html

So I'm guessing - backup /etc, /var, /usr/local/etc, and /usr/local/var

then do:

freebsd-update -r 8.2-RELEASE upgrade

  freebsd-update install

  shutdown -r now

freebsd-update install

#  portupgrade -f ruby
#  rm /var/db/pkg/pkgdb.db
#  portupgrade -f ruby18-bdb
#  rm /var/db/pkg/pkgdb.db /usr/ports/INDEX-*.db
#  portupgrade -af

  freebsd-update install


How will this affect my Jails though? Will I need to rebuild them also?

I mean how will I know if everything is the same as before the upgrade 
but obviously just newer?