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%sudo freebsd-update fetch
Looking up update.FreeBSD.org mirrors... 4 mirrors found.
Fetching metadata signature for 7.4-RELEASE from update4.FreeBSD.org... done.
Fetching metadata index... done.
Inspecting system... done.
Preparing to download files... done.

The following files will be added as part of updating to 7.4-RELEASE-p6:
/usr/src/lib/libc/gen/libc_dlopen.c

%sudo freebsd-update install
Installing updates...install: ///usr/src/lib/libc/gen/libc_dlopen.c: No such file or directory
done.

上記エラーは、以下のページを見て解決した
運用ネタ(FreeBSD) freebsd-update がエラーメッセージをはいてこける件 | 世迷言

%sudo mkdir /usr/src/lib/
%sudo mkdir /usr/src/lib/libc/
%sudo mkdir /usr/src/lib/libc/gen
%sudo freebsd-update fetch
Looking up update.FreeBSD.org mirrors... 4 mirrors found.
Fetching metadata signature for 7.4-RELEASE from update4.FreeBSD.org... done.
Fetching metadata index... done.
Inspecting system... done.
Preparing to download files... done.

The following files will be added as part of updating to 7.4-RELEASE-p6:
/usr/src/lib/libc/gen/libc_dlopen.c

%sudo freebsd-update install
Installing updates... done.
%sudo freebsd-update fetch
Looking up update.FreeBSD.org mirrors... 4 mirrors found.
Fetching metadata signature for 7.4-RELEASE from update4.FreeBSD.org... done.
Fetching metadata index... done.
Inspecting system... done.
Preparing to download files... done.

No updates needed to update system to 7.4-RELEASE-p6.
%

サポート期限（2012.03.31）が近づいていた
7.3RELEASE のシステムを7.4RELEASEにfreebsd-updateを使用して更新した
アップグレード開始
#freebsd-update -r 7.4-RELEASE upgrade
Looking up update.FreeBSD.org mirrors... 4 mirrors found.
Fetching metadata signature for 7.3-RELEASE from update5.FreeBSD.org... done.
Fetching metadata index... done.
Fetching 1 metadata patches. done.
Applying metadata patches... 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 7.4-RELEASE from update5.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 7.3-RELEASE for merging... done.
Preparing to download files... done.
Fetching 20394 patches.....10....20....30....40....50....60....70....80....90....100....110....120....130....
................................................................................
60....20370....20380....20390.. done.
Applying patches... done.
Fetching 1123 files...
.................
いくつか更新の確認があった

カーネルの更新
#freebsd-update -r 7.4-RELEASE install
Installing updates...
Kernel updates have been installed. Please reboot and run
"/usr/sbin/freebsd-update install" again to finish installing updates.

リブートしてユーザーランの更新
#reboot
#freebsd-update install
Installing updates... done.

終了後リブートして完了した
#reboot

FreeBSD RELEASE ７．３ のサポート期限が近付いてきました
FreeBSD Security Information
The current supported branches and expected EoL dates are:

+---------------------------------------------------------------------+
|  Branch   |  Release   |  Type  |   Release date  |  Estimated EoL  |
|-----------+------------+--------+-----------------+-----------------|
|RELENG_7   |n/a         |n/a     |n/a              |February 28, 2013|
|-----------+------------+--------+-----------------+-----------------|
|RELENG_7_3 |7.3-RELEASE |Extended|March 23, 2010   |March 31, 2012   |
|-----------+------------+--------+-----------------+-----------------|
|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_9   |n/a         |n/a     |n/a              |last release + 2y|
|-----------+------------+--------+-----------------+-----------------|
|RELENG_9_0 |9.0-RELEASE |Normal  |January 10, 2012 |January 31, 2013 |
+---------------------------------------------------------------------+