Novell LINUX ENTERPRISE SERVER 10 - INSTALLATION AND ADMINISTRATION 04-08-2006 Installation Manual page 735

40.2.10 Security against Attacks
During transmission, the data should ideally be protected against interception and ma-
nipulation. Unison, CVS, rsync, and Subversion can easily be used via ssh (secure
shell), providing security against attacks of this kind. Running CVS or Unison via rsh
(remote shell) should be avoided. Accessing CVS with the pserver mechanism in inse-
cure networks is likewise not advisable. Subversion already provides the necessary se-
curity measures by running with Apache.
40.2.11 Protection against Data Loss
CVS has been used by developers for a long time to manage program projects and is
extremely stable. Because the development history is saved, CVS even provides protec-
tion against certain user errors, such as unintentional deletion of a file. Despite Subver-
sion not being as common as CVS, it is already being employed in productive environ-
ments, for example, by the Subversion project itself.
Unison is still relatively new, but boasts a high level of stability. However, it is more
sensitive to user errors. Once the synchronization of the deletion of a file has been
confirmed, there is no way to restore the file.
Table 40.1 Features of the File Synchronization Tools: -- = very poor, - = poor or
not available, o = medium, + = good, ++ = excellent, x = available
unison
Client/Server equal
Portability Lin,Un*x,Win
Interactivity x
Speed -
Conflicts o
File Sel. Dir.
CVS/SVN rsync
C-S/C-S C-S
Lin,Un*x,Win Lin,Un*x,Win
x/x x
o/+ +
++/++ o
Sel./file, dir. Dir.
mailsync
equal
Lin,Un*x
-
+
+
Mailbox
File Synchronization 735