03-01-2012
If I remember rsync (and rdist but not sure anymore... long time) had a possibility on not overwiting if files were indentical...Now the question is more when you are syncing, it is more to update for all users (concerned) their passwd they have changed on the master server, then update modifications like new users and groups... Till here you should not have any issues.
Removing users is different for you find yourself having to decide what to do with users files all over the system(s) so it is not wise to remove them on the master before you have decided what to do and cleanup on all slaves then master.
What we used to do e.g. new user: create on master then create the accounts where needed in urgence so the user could work immediatly not having to wait for synch...
Have a script ready for synchro you can use anytime if needed and schedule a synchor when there is minimum activity
I would go with rsync...
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LEARN ABOUT DEBIAN
update-passwd
UPDATE-PASSWD(8) System Manager's Manual UPDATE-PASSWD(8)
NAME
update-passwd - safely update /etc/passwd, /etc/shadow and /etc/group
SYNOPSIS
update-passwd [options]
DESCRIPTION
update-passwd handles updates of /etc/passwd, /etc/shadow and /etc/group on running Debian systems. It compares the current files to mas-
ter copies, distributed in the base-passwd package, and updates all entries in the global system range (that is, 0-99).
OPTIONS
update-passwd follows the usual GNU command line syntax, with long options starting with two dashes ('-').
-p, --passwd-master=FILE
Use FILE as the master copy of the passwd database. The default value is /usr/share/base-passwd/passwd.master.
-g, --group-master=FILE
Use FILE as the master copy of the group database. The default value is /usr/share/base-passwd/group.master.
-P, --passwd=FILE
Use FILE as the system passwd database. The default value is /etc/passwd.
-S, --shadow=FILE
Use FILE as the system shadow database. The default value is /etc/shadow.
-G, --group=FILE
Use FILE as the system group database. The default value is /etc/group.
-s, --sanity-check
Only perform sanity-checks but don't do anything.
-v, --verbose
Give detailed information about what we are doing. A second -v gives additional detail.
-n, --dry-run
Don't do anything but only show what we would do.
-L, --no-locking
Don't attempt to lock the account database. This should only be used for debugging purposes. I repeat: do not do this unless you
are really sure you need this!
-h, --help
Show a summary of how to use update-passwd.
-V, --version
Show the version number
BUGS
At this moment update-passwd does not verify the shadow-file. It should check if the entries in the passwd are also in shadow and vice
versa, and that passwords are not present in both files.
AUTHOR
Wichert Akkerman <wakkerma@debian.org>
This program was written for the Debian project, and is copyright 1999-2002 Wichert Akkerman and copyright 2002, 2003 Colin Watson. It is
distributed under version 2 of the GNU General Public License.
DEBIAN
Debian tools UPDATE-PASSWD(8)