Re: pre/post run commands
2003-07-06 15:47:29
On Sun, Jul 06, 2003 at 09:36:56AM -0700, Scott Petler wrote:
> Hi,
> I am using amanda to back up to a hard disk on my system and would
> like to protect the backed up disk from accidental erasure. I thought
> one way to do this would be to mount it then run amdump, and then umount it.
> The disk is going to be vulnerable during the backup period, but "safe"
> when not doing a backup or recover.
>
> Is there a way to do this? Or are there some permission settings that
> would prevent a rm -rf /* as root from erasing all of the backup disk?
In general, permissions are not checked for root.
So I doubt any setting of permissions would help.
Even root can not modify a file on a file system mounted read-only.
You could mount it rw during backup, ro other times. The advantage
to mounting it ro is that you can still do recoveries from the backed
up data.
Putting umount/mount commands in your cron might work.
I'd be worried that the umount and mount would fail if something
had a file open on that file system. Some mount commands (possibly
FS type specific) may have an option to do a "remount". This option
may let you change the properties of the mount without affecting open
files. Note, I said "may let you", I've never tried it.
--
Jon H. LaBadie jon AT jgcomp DOT com
JG Computing
4455 Province Line Road (609) 252-0159
Princeton, NJ 08540-4322 (609) 683-7220 (fax)
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