freebsd-update man page on FreeBSD

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FREEBSD-UPDATE(8)	  BSD System Manager's Manual	     FREEBSD-UPDATE(8)

NAME
     freebsd-update — fetch and install binary updates to FreeBSD

SYNOPSIS
     freebsd-update [-b basedir] [-d workdir] [-f conffile] [-k KEY]
		    [-r newrelease] [-s server] [-t address] command ...

DESCRIPTION
     The freebsd-update tool is used to fetch, install, and rollback binary
     updates to the FreeBSD base system.  Note that updates are only available
     if they are being built for the FreeBSD release and architecture being
     used; in particular, the FreeBSD Security Team only builds updates for
     releases shipped in binary form by the FreeBSD Release Engineering Team,
     e.g., FreeBSD 7.3-RELEASE and FreeBSD 8.0, but not FreeBSD 6.3-STABLE or
     FreeBSD 9.0-CURRENT.

OPTIONS
     The following options are supported

     -b basedir	  Operate on a system mounted at basedir.  (default: /, or as
		  given in the configuration file.)

     -d workdir	  Store working files in workdir.  (default:
		  /var/db/freebsd-update/, or as given in the configuration
		  file.)

     -f conffile  Read configuration options from conffile.  (default:
		  /etc/freebsd-update.conf)

     -k KEY	  Trust an RSA key with SHA256 of KEY.	(default: read value
		  from configuration file.)

     -r newrelease
		  Specify the new release to which freebsd-update should
		  upgrade (upgrade command only).

     -s server	  Fetch files from the specified server or server pool.
		  (default: read value from configuration file.)

     -t address	  Mail output of cron command, if any, to address.  (default:
		  root, or as given in the configuration file.)

COMMANDS
     The command can be any one of the following:

     fetch	  Based on the currently installed world and the configuration
		  options set, fetch all available binary updates.

     cron	  Sleep a random amount of time between 1 and 3600 seconds,
		  then download updates as if the fetch command was used.  If
		  updates are downloaded, an email will be sent (to root or a
		  different address if specified via the -t option or in the
		  configuration file).	As the name suggests, this command is
		  designed for running from cron(8); the random delay serves
		  to minimize the probability that a large number of machines
		  will simultaneously attempt to fetch updates.

     upgrade	  Fetch files necessary for upgrading to a new release.
		  Before using this command, make sure that you read the
		  announcement and release notes for the new release in case
		  there are any special steps needed for upgrading.

     install	  Install the most recently fetched updates or upgrade.

     rollback	  Uninstall the most recently installed updates.

     IDS	  Compare the system against a "known good" index of the
		  installed release.

TIPS
     ·	 If your clock is set to local time, adding the line

	       0 3 * * * root /usr/sbin/freebsd-update cron

	 to /etc/crontab will check for updates every night.  If your clock is
	 set to UTC, please pick a random time other than 3AM, to avoid overly
	 imposing an uneven load on the server(s) hosting the updates.

     ·	 In spite of its name, IDS should not be relied upon as an "Intrusion
	 Detection System", since if the system has been tampered with it can‐
	 not be trusted to operate correctly.  If you intend to use this com‐
	 mand for intrusion-detection purposes, make sure you boot from a
	 secure disk (e.g., a CD).

FILES
     /etc/freebsd-update.conf  Default location of the freebsd-update configu‐
			       ration file.

     /var/db/freebsd-update/   Default location where freebsd-update stores
			       temporary files and downloaded updates.

SEE ALSO
     freebsd-update.conf(5)

AUTHORS
     Colin Percival ⟨cperciva@FreeBSD.org⟩

FreeBSD				 July 14, 2010			       FreeBSD
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