Re: [rdiff-backup-users] Best method for testing if another rdiff-backup session in progress?

[phowell]

Jason

We use a check in the bash script that runs rdiffbackup. This puts a pid 
file into the var run directory and causes the script to block if the 
script has not cleared it at the end.

if test -e /var/run/remotebackup.pid; then
 echo "Backup is already running!"
 echo "If it isn't, remove /var/run/backup.pid and try again."
 exit 0;
else
 echo $$ > /var/run/remotebackup.pid;
fi

...do the work here

# Remove lock file and end script
#
if test -e /var/run/remotebackup.pid; then
 rm /var/run/remotebackup.pid;
 else
 echo "Could not remove lock file!" >> $LOGFILE
fi

Peter Howell



Jason L. Buberel wrote:
> On my backup server I use rdiff-backup to remotely backup several 
> rather large postgres database installations (using the postgres 
> hot-backup capability). Under certain circumstances, these backups can 
> take a very long time to complete.
>
> The execution of these backups is scheduled via cron.
>
> And when they take a very, very long time they can start to overlap. 
> When this happens, I get an error message from rdiff-backup:
>
> Fatal Error: It appears that a previous rdiff-backup session with process
> id 21022 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.
> Fatal Error: Lost connection to the remote system
>
> I would like to write a small script called 'exit-if-already-running.sh' that 
> takes the name of an rdiff-backup directory (the directory containing the 
> directory named 'rdiff-backup'), and exits with return code 1 if a back is 
> already in progress. That would allow me to use it as such:
>
> 10 5 * * * root /usr/local/bin/exit-if-already-running.sh /backup/srv1 && 
> /usr/bin/rdiff-backup srv1::/remote-dir /backup/srv1
>
> What is the most reliable method to determine if rdiff-backup is already 
> running on the destination directory?
>
> Thanks,
> Jason
>   
> ------------------------------------------------------------------------
>
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