[j-nsp] Old JunOS upgrade path

Saku Ytti saku at ytti.fi
Sun Mar 10 10:49:03 EDT 2019

On Sun, Mar 10, 2019 at 4:30 PM Tom Beecher <beecher at beecher.cc> wrote:

> was when it was shut down. ( Hopefully. :) ) When you upgrade it, the
> process only modifies certain components. Any OS upgrade process like that

This is not true, the upgrade is fresh install. It is not like you do
upgrade on your laptop FreeBSD or Linux.

Equivalent on your laptop would be that you keep your config in
directory /config, have that in partition you don't touch then
reinstall new FreeBSD on your system partition and remount that
/config partition. You just lost all the programs you've installed
outside base system and any other changes you've done outside /config.

Your laptop FreeBSD doesn't know what exists in the system what data
has been changed, what has been installed it can't just steamroll the
installation with new, so it'll reinstall new stuff on top of old one
for the things it knows about. Juniper doesn't have this problem, they
know what is the state of the system so they can just streamroll it
and they do.


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