NetBSD/distrib/notes/common/upgrade

.\"	$NetBSD: upgrade,v 1.18 2002/07/19 07:17:49 scottr Exp $
.\"
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.
.
.Pp
The upgrade to
.Nx \*V
is a binary upgrade; it can be quite difficult to update the system
from an earlier version by recompiling from source, primarily due to
interdependencies in the various components.
.Pp
.ie r_atari \{\
To do the upgrade, you must first boot the system as described in the
.Sx Booting the installer
section.
.\}
.el \{\
.ie \n[mac68k]:\n[macppc]:\n[sparc] \{\
To do the upgrade, you must boot from the installer kernel using one of
the methods described above.
.\}
.el \{\
.ie r_pmax \{\
To do the upgrade, you must install new bootblocks and boot off
the
.Ic install
kernel as described in the
.Sx Installing from an existing system
section.
.\}
.el \{\
.ie r_x68k \{\
As noted above, you must have the
.Pa loadbsd.x
utility and the installation kernel you chose, or, the
boot floppies available to do the upgrade.
.\}
.el \{\
To do the upgrade, you must have the boot floppy
.if r_alpha set
available.
.\}\}\}\}
You must also have at least the
.Sy base
and
.Sy kern
binary distribution sets available, so that you can upgrade with them,
using one of the upgrade methods described above.
Finally, you must have sufficient disk space available to install the
new binaries.
Since the old binaries are being overwritten in place, you only need
space for the new binaries, which weren't previously on the system.
If you have a few megabytes free on each of your root
.Pq Pa /
and
.Pa /usr
partitions, you should have enough space.
.Pp
Since upgrading involves replacing the boot blocks on your
.Nx
partition, the kernel, and most of the system binaries, it has the
potential to cause data loss.
You are strongly advised to 
.Em back up 
any important data on your disk, whether on the
.Nx
partition or on
another operating system's partition, before beginning the upgrade
process.
.if r_macppc \{\
Since installation of the bootloader will prevent
.Tn Mac OS
from using the disk and will prevent Open Firmware 3 machines from
booting, there is an option to bypass this step.
Make sure you know whether or not to install the bootloader.
.\}
.Pp
The upgrade procedure using the
.Ic sysinst
tool is similar to an installation, but without the hard disk partitioning.
The original
.Pa /etc
directory is renamed to
.Pa /etc.old ,
and no attempt is made to merge any of the previous configuration into
the new system except that the previous
.Pa /etc/fstab
file is copied into the new configuration.
Getting the binary
sets is done in the same manner as the installation procedure;
refer to the installation part of the document
for how to do this.
Also, some sanity checks are done, i.e.
file systems are checked before unpacking the sets.
.Pp
After a new kernel has been copied to your hard disk, your
machine is a complete
.Nx \*V
system.
However, that doesn't mean that you're finished with the upgrade process.
You will probably want to update the set of device
nodes you have in
.Pa /dev .
If you've changed the contents of
.Pa /dev
by hand, you will need to be careful about this, but if
not, you can just cd into
.Pa /dev ,
and run the command:
.Pp
.Dl # Ic "sh MAKEDEV all"
.Pp
Finally, you will want to delete old binaries that were part
of the version of
.Nx
that you upgraded from and have since been removed from the
.Nx
distribution.