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Using FreeBSD's ACLs
Pages: 1, 2, 3, 4, 5, 6

Backing Up ACLs

One of the things you need to be aware of if you plan to use ACLs is that most backup utilities will correctly backup files containing ACLs, and even restore those files, but not their ACLs. A good solution to this is to install /usr/ports/archivers/star from the ports collection. If you've ever used tar, it won't take long to train yourself to add a few extra switches to catch all of those ACLs.

In this example, the superuser has made a backup directory for dru outside of her home directory so she can store backups of her home directory.

# mkdir -p /usr/backups/dru
# chmod dru:dru /usr/backups/dru
# exit

Next, dru backs up her home directory, which contains files with ACLs:

% whoami
dru
% cd
% star -cv -Hexustar -acl -f /usr/backups/dru/home.tgz .

Next, dru will try a test restore in a temporary directory in her home directory:

% mkdir ~/tmp
% cd ~/tmp
% star -xv -Hexustar -acl -f home.tgz

Note: If you try to restore to a filesystem that doesn't have ACLs enabled, star will complain but will still restore the files minus the ACLs.

Conclusion

Many users either haven't yet heard of the benefits of ACLs or believe them to be difficult to use. Spend a half an hour showing your users how to use eiciel and star, and they'll wonder how they ever lived without ACLs.

Dru Lavigne is a network and systems administrator, IT instructor, author and international speaker. She has over a decade of experience administering and teaching Netware, Microsoft, Cisco, Checkpoint, SCO, Solaris, Linux, and BSD systems. A prolific author, she pens the popular FreeBSD Basics column for O'Reilly and is author of BSD Hacks and The Best of FreeBSD Basics.


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