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サポート期限（2012.07.31）の8.1RELEASE のシステムを8.3RELEASEにfreebsd-updateを使用して更新してみた
サポート期限

+---------------------------------------------------------------------+
|  Branch   |  Release   |  Type  |   Release date  |  Estimated EoL  |
|-----------+------------+--------+-----------------+-----------------|
|RELENG_7   |n/a         |n/a     |n/a              |February 28, 2013|
|RELENG_7_4 |7.4-RELEASE |Extended|February 24, 2011|February 28, 2013|
|-----------+------------+--------+-----------------+-----------------|
|RELENG_8   |n/a         |n/a     |n/a              |last release + 2y|
|-----------+------------+--------+-----------------+-----------------|
|RELENG_8_1 |8.1-RELEASE |Extended|July 23, 2010    |July 31, 2012    |
|-----------+------------+--------+-----------------+-----------------|
|RELENG_8_2 |8.2-RELEASE |Normal  |February 24, 2011|July 31, 2012    |
|-----------+------------+--------+-----------------+-----------------|
|RELENG_8_3 |8.3-RELEASE |Extended|April 18, 2012 　|April 30, 2014   |
|-----------+------------+--------+-----------------+-----------------|
|RELENG_9   |n/a         |n/a     |n/a              |last release + 2y|
|-----------+------------+--------+-----------------+-----------------|
|RELENG_9_0 |9.0-RELEASE |Normal  |January 10, 2012 |January 31, 2013 |
+---------------------------------------------------------------------+

アップグレード開始
#freebsd-update -r 8.3-RELEASE upgrade
Looking up update.FreeBSD.org mirrors... 4 mirrors found.
Fetching metadata signature for 8.1-RELEASE from update4.FreeBSD.org... done.
Fetching metadata index... done.
Inspecting system... done.

The following components of FreeBSD seem to be installed:
kernel/generic src/base src/sys world/base world/dict world/doc
world/info world/manpages world/proflibs

The following components of FreeBSD do not seem to be installed:
src/bin src/cddl src/contrib src/crypto src/etc src/games src/gnu
src/include src/krb5 src/lib src/libexec src/release src/rescue src/sbin
src/secure src/share src/tools src/ubin src/usbin world/catpages
world/games

Does this look reasonable (y/n)? y

Fetching metadata signature for 8.3-RELEASE from update4.FreeBSD.org... done.
Fetching metadata index... done.
Fetching 1 metadata patches. done.
Applying metadata patches... done.
Fetching 1 metadata files... done.
Inspecting system... done.
Fetching files from 8.1-RELEASE for merging... done.
Preparing to download files... done.
Fetching 17390 patches.....10....20...
Applying patches... done.
Fetching 1178 files... done.
Attempting to automatically merge changes in files... done.

The following file could not be merged automatically: /etc/hosts
Press Enter to edit this file in vi and resolve the conflicts
manually...
The following changes, which occurred between FreeBSD 8.1-RELEASE and
FreeBSD 8.3-RELEASE have been merged into /boot/device.hints:
The following changes, which occurred between FreeBSD 8.1-RELEASE and
FreeBSD 8.3-RELEASE have been merged into /etc/group:
The following changes, which occurred between FreeBSD 8.1-RELEASE and
FreeBSD 8.3-RELEASE have been merged into /etc/hosts:
The following changes, which occurred between FreeBSD 8.1-RELEASE and
FreeBSD 8.3-RELEASE have been merged into /etc/master.passwd:
The following changes, which occurred between FreeBSD 8.1-RELEASE and
FreeBSD 8.3-RELEASE have been merged into /etc/passwd:
The following changes, which occurred between FreeBSD 8.1-RELEASE and
FreeBSD 8.3-RELEASE have been merged into /etc/ssh/sshd_config:
The following changes, which occurred between FreeBSD 8.1-RELEASE and
FreeBSD 8.3-RELEASE have been merged into /etc/ttys:

The following files will be removed as part of updating to 8.3-RELEASE-p0:

# freebsd-update -r 8.3-RELEASE install
Installing updates...
Kernel updates have been installed. Please reboot and run
"/usr/sbin/freebsd-update install" again to finish installing updates.

#reboot

# freebsd-update install
Installing updates... done.
#reboot

%uname -a
FreeBSD bsd.iwata.dip.jp 8.3-RELEASE FreeBSD 8.3-RELEASE #0: Mon Apr 9 21:47:23 UTC 2012 root@almeida.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386