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Special Forums Hardware Filesystems, Disks and Memory Help finding a Unix friendly RAID 1 backup Post 302522986 by Corona688 on Tuesday 17th of May 2011 12:09:13 PM
Old 05-17-2011
Glad it worked for you.

I needed to do some more research into rsync, I hadn't used it lately, but understand it a bit better now.

If you want to synchronize the contents of the two drives, I'd stick to just updating the /home/ partition, that seems to be where all the changing data is kept:
  1. Plug in the USB drive, and run fdisk -l to see what it shows up as. Your internal disk showed up as sda, so I suspect the external will show up as sdb, but best not to assume.
  2. Mount the external drive's home directory onto /mnt/external. To do this, mkdir -p /mnt/external ; mount /dev/sdb6 /mnt/external.
  3. Use rsync to copy new files to the drive. rsync --dry-run -r -a -H /home/ /mnt/external
  4. Optionally, if you want, use rsync to delete files from /mnt/external that no longer exist in /home/ rsync --dry-run -r --delete -a -H /home/ /mnt/external
  5. umount /mnt/external && sync wait for it to finish and then it will be safe for you to remove the USB drive, if you want to.
Note how I'm doing
Code:
rsync ... /path/ /path2

Having the exact right number of slashes is crucial.

Also, for the record, the various flags I'm giving it have these meanings:
Code:
-r    Recursively, so it checks folders in folders in folders
--dry-run    Only says what it's copying or deleting and doesn't actually do it!
                  Remove when you're confident it's copying what you want where you want.
--delete      Removes files not found in the source from the destination
-a               Preserves many things like ownership and timestamps
-H              Preserves hard links.  May not be necessary, and may improve performance to leave out.


Last edited by Corona688; 05-17-2011 at 01:14 PM..
 

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rsync_selinux(8)					rsync Selinux Policy documentation					  rsync_selinux(8)

NAME
rsync_selinux - Security Enhanced Linux Policy for the rsync daemon DESCRIPTION
Security-Enhanced Linux secures the rsync server via flexible mandatory access control. FILE_CONTEXTS SELinux requires files to have an extended attribute to define the file type. Policy governs the access daemons have to these files. If you want to share files using the rsync daemon, you must label the files and directories public_content_t. So if you created a special directory /var/rsync, you would need to label the directory with the chcon tool. chcon -t public_content_t /var/rsync To make this change permanent (survive a relabel), use the semanage command to add the change to file context configuration: semanage fcontext -a -t public_content_t "/var/rsync(/.*)?" This command adds the following entry to /etc/selinux/POLICYTYPE/contexts/files/file_contexts.local: /var/rsync(/.*)? system_u:object_r:publix_content_t:s0 Run the restorecon command to apply the changes: restorecon -R -v /var/rsync/ SHARING FILES
If you want to share files with multiple domains (Apache, FTP, rsync, Samba), you can set a file context of public_content_t and pub- lic_content_rw_t. These context allow any of the above domains to read the content. If you want a particular domain to write to the pub- lic_content_rw_t domain, you must set the appropriate boolean. allow_DOMAIN_anon_write. So for rsync you would execute: setsebool -P allow_rsync_anon_write=1 BOOLEANS
system-config-selinux is a GUI tool available to customize SELinux policy settings. AUTHOR
This manual page was written by Dan Walsh <dwalsh@redhat.com>. SEE ALSO
selinux(8), rsync(1), chcon(1), setsebool(8), semanage(8) dwalsh@redhat.com 17 Jan 2005 rsync_selinux(8)
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