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Suse openSUSE 12.2 Manual

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Using the YaST Snapper module or the snapper command line tool, you can undo
the changes made by YaST/zypper by restoring les from the “pre-snapshot”. Comparing
two snapshots the tools also allow you to see which les have been changed. You can
also display the differences between two versions of a le (diff).
Since Linux is a multitasking system, processes other than YaST or zypper may modify
data in the timeframe between the pre- and the post-snapshot. If this is the case, com-
pletely reverting to the pre-snapshot will also undo these changes by other processes.
In most cases this would be unwanted—therefore it is strongly recommended to closely
review the changes between two snapshots before starting the rollback. If there are
changes from other processes you want to keep, select which les to roll back.
IMPORTANT: Limitations
Make sure you know about Snapper's limitations before attempting to use its
rollback mechanism. See Section 4.7, “Limitations” (page 111) for details.
NOTE: Storage Time of Snapshots
By default, the last 100 YaST and zypper snappshots are being kept. If this
number is exceeded, the oldest snapshot(s) will be deleted.
Procedure 4.1:
Undoing changes using the YaST Snapper module
1
Start the Snapper module from the Miscellaneous section in YaST or by entering
yast2 snapper.
2
Make sure Current Conguration is set to root. This is always the case unless you
have manually added own Snapper congurations.
3
Choose a pair of pre- and post-snapshots from the list. Both, YaST and zypper
snapshot pairs are of the type Pre & Post. YaST snapshots are labeled as yast
module_name in the Description column; zypper snapshots are labeled zypp
(zypper).
Snapshots/Rollback with Snapper 99
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