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Alex Samad
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 Posted: Wed Dec 16, 2009 7:10 pm Post subject: locking the rdiff-backup destination |
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Hi
Is there a tool to lock the db such that rdif-backup will not use the
destination - i know rdif-backup does it.
I want to lock the db and then rsync the destination offsite and then
unlock the db.
I am also looking at doing a lvm snapshot as well.
Alex
--
"The person who runs FEMA is someone who must have the trust of the president. Because the person who runs FEMA is the first voice, often times, of someone whose life has been turned upside down hears from."
- George W. Bush
01/04/2001
Austin, TX
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Jakob Unterwurzacher
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| Posted: Tue Dec 22, 2009 2:14 am Post subject: locking the rdiff-backup destination |
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Alex Samad schrieb:
| Quote: | Hi
Is there a tool to lock the db such that rdif-backup will not use the
destination - i know rdif-backup does it.
I want to lock the db and then rsync the destination offsite and then
unlock the db.
|
With "db" you mean the rdiff-backup destination directory?
Jakob
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Alex Samad
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| Posted: Wed Dec 23, 2009 1:08 pm Post subject: locking the rdiff-backup destination |
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On Tue, Dec 22, 2009 at 11:13:44AM +0100, Jakob Unterwurzacher wrote:
| Quote: | Alex Samad schrieb:
| Quote: | Hi
Is there a tool to lock the db such that rdif-backup will not use the
destination - i know rdif-backup does it.
I want to lock the db and then rsync the destination offsite and then
unlock the db.
|
With "db" you mean the rdiff-backup destination directory?
|
yes, I would like to lock the rdiff-backup destination such that
rdiff-backup will not use it until after the rsync offsite has finished.
--
"I don't want nations feeling like that they can bully ourselves and our allies. I want to have a ballistic defense system so that we can make the world more peaceful, and at the same time I want to reduce our own nuclear capacities to the level commiserate with keeping the peace."
- George W. Bush
10/23/2000
Des Moines, IA
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Jakob Unterwurzacher
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| Posted: Wed Dec 23, 2009 5:39 pm Post subject: locking the rdiff-backup destination |
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Am 2009-12-23 22:06, schrieb Alex Samad:
| Quote: | On Tue, Dec 22, 2009 at 11:13:44AM +0100, Jakob Unterwurzacher wrote:
| Quote: | Alex Samad schrieb:
| Quote: | Hi
Is there a tool to lock the db such that rdif-backup will not use the
destination - i know rdif-backup does it.
I want to lock the db and then rsync the destination offsite and then
unlock the db.
|
With "db" you mean the rdiff-backup destination directory?
|
yes, I would like to lock the rdiff-backup destination such that
rdiff-backup will not use it until after the rsync offsite has finished.
|
I guess you will have to use a wrapper script for your rsync job and
your rdiff-backup job that does the locking (and obeys the lock).
If you start both jobs at the same machine, it's easy:
Put this at the start of each script - it will then exit when another
instance is running.
#####
#!/bin/bash
exec 200> /tmp/lockfileXYZ
flock -n 200 || echo 'Could not get lock!' && exit 1
#####
Jakob
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Alex Samad
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| Posted: Wed Dec 23, 2009 9:51 pm Post subject: locking the rdiff-backup destination |
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On Thu, Dec 24, 2009 at 02:38:23AM +0100, Jakob Unterwurzacher wrote:
| Quote: | Am 2009-12-23 22:06, schrieb Alex Samad:
| Quote: | On Tue, Dec 22, 2009 at 11:13:44AM +0100, Jakob Unterwurzacher wrote:
| Quote: | Alex Samad schrieb:
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[snip]
| Quote: |
I guess you will have to use a wrapper script for your rsync job and
your rdiff-backup job that does the locking (and obeys the lock).
|
yep doing something like that already, but I noticed that rdiff-backup
has a way of knowing when another riff-backup is running against the
dest, it would be could to be able to trigger that flag as well from
outside rdiff-backup
[snip]
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Dominic Raferd
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| Posted: Thu Dec 24, 2009 2:07 am Post subject: locking the rdiff-backup destination |
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Jakob Unterwurzacher wrote:
| Quote: | I guess you will have to use a wrapper script for your rsync job and
your rdiff-backup job that does the locking (and obeys the lock).
If you start both jobs at the same machine, it's easy:
Put this at the start of each script - it will then exit when another
instance is running.
#####
#!/bin/bash
exec 200> /tmp/lockfileXYZ
flock -n 200 || echo 'Could not get lock!' && exit 1
#####
|
Nice tip! An alternative which doesn't require flock or a temporary lock
file is (again for a bash script):
######
#!/bin/bash
[ -n "`ps h -C rdiff-backup`" ] && echo "`basename $0` aborting -
rdiff-backup is running" && exit 1
######
Dominic
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Jakob Unterwurzacher
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| Posted: Thu Dec 24, 2009 2:36 am Post subject: locking the rdiff-backup destination |
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Am 2009-12-24 06:50, schrieb Alex Samad:
| Quote: | | Quote: |
I guess you will have to use a wrapper script for your rsync job and
your rdiff-backup job that does the locking (and obeys the lock).
|
yep doing something like that already, but I noticed that rdiff-backup
has a way of knowing when another riff-backup is running against the
dest, it would be could to be able to trigger that flag as well from
outside rdiff-backup
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Indeed. I had not noticed that.
This is what rdiff-backup does (strace) when there is another instance
running:
| Quote: | $ strace rdiff-backup /usr/sbin /tmp/des
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[...]
| Quote: | open("/tmp/des/rdiff-backup-data/current_mirror.2009-12-24T10:50:52+01:00.data", O_RDONLY|O_LARGEFILE) = 4
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[...]
| Quote: | read(4, "PID 9157\n", 4096) = 9
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[...]
| Quote: | kill(9157, SIG_0) = 0
write(2, "Fatal Error: It appears that a p"..., 298
Fatal Error: It appears that a previous rdiff-backup session with process
id 9157 is still running. If two different rdiff-backup processes write
the same repository simultaneously, data corruption will probably
result. To proceed with regress anyway, rerun rdiff-backup with the
--force option.
) = 298
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So, when you read out the PIDs from the
rdiff-backup-data/current_mirror.*
files (they contain "PID 12345"), check whether one of them is running,
and none is, then it's safe to start rsync.
Note that
$ kill -0 PID
is somewhat unsafe as a check whether PID is running. It will return 1
when the process does not exist but will also return 1 when the process
exists but you don't have the permission to send a signal to it. I'd use
ps -p.
Jakob
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Wiki URL: http://rdiff-backup.solutionsfirst.com.au/index.php/RdiffBackupWiki |
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