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
squid_unix_group
squid_unix_group(8) System Manager's Manual squid_unix_group(8)
NAME
squid_unix_group - Squid UNIX Group external_acl helper
SYNOPSIS
squid_unix_group [-g groupname] [-g groupname...] [-p] [-s]
DESCRIPTION
This helper allows Squid to base access controls on users memberships in UNIX groups.
-g groupname
Specifies a group name to match.
-p Also match the users primary group from /etc/passwd
-s Strip NT domain name component from user names (/ or separated)
EXAMPLES
This squid.conf example defines two Squid acls. usergroup1 matches users in group1, and usergroup2 matches users in group2 or group3
external_acl_type unix_group %LOGIN /usr/local/squid/libexec/squid_unix_group -p
acl usergroup1 external unix_group group1
acl usergroup2 external unix_group group2 group3
NOTES
By default up to 11 groups can be matched in one acl (including commandline specified groups). This limit is defined by MAX_GROUPS in the
source code.
AUTHOR
This manual page was written by Henrik Nordstrom <hno@squid-cache.org>
squid_unix_group is written by Rodrigo Campos <rodrigo@geekbunker.org>
KNOWN ISSUES
Does not understand gid aliased groups sometimes used to work around groups size limitations. If you are using gid aliased groups then you
must specify each alias by name.
QUESTIONS
Any questions on usage can be sent to Squid Users <squid-users@squid-cache.org>
REPORTING BUGS
Report bugs or bug-fixes to Rodrigo Campos <rodrigo@geekbunker.org> or Squid Developers <squid-dev@squid-cache.org>
SEE ALSO
group(5),passwd(5)
Squid UNIX Group helper 12 August 2002 squid_unix_group(8)