rsync - Dec 2008 - restart rsync process via shell script

Hi there,

I am trying to figure out the most accurate way to assess if an rsync 
process is running and is established to the remote rsync server and is 
transferring data.  I am writing a bourne shell script to restart rsync 
if the connection to the remote rsync server is lost.

The command "ps ax | grep 'rsync' | grep -v grep"  is not
enough because
the rsync and ssh process can be running but the connection to the 
remote server is no longer ESTABLISHED and the backup is no longer 
proceeding.

Then perhaps the command "netstat -A | grep '192.168.1.10' | grep 
'ESTABLISHED' | grep -v grep" would be helpful.  But in some cases
I
have found that I have ssh connections to the remote rsync server that 
obfuscate the rsync ssh ESTABLISH statistics.

the rsync command I am using is: "/usr/bin/rsync -avz
'/Users/noah/' -e
'ssh -p 22' root@192.168.1.10:/Users"

Any suggestions please?

Cheers,

Noah

On Mon, 2008-12-29 at 08:13 -0800, Noah wrote:
> I am trying to figure out the most accurate way to assess if an rsync 
> process is running and is established to the remote rsync server and is 
> transferring data.  I am writing a bourne shell script to restart rsync 
> if the connection to the remote rsync server is lost.
Try the --timeout option, which will make rsync exit if no progress is
made for a specified time period.  This is probably easier and more
reliable than coding your own timeout.
> The command "ps ax | grep 'rsync' | grep -v grep"  is not
enough because
> the rsync and ssh process can be running but the connection to the 
> remote server is no longer ESTABLISHED and the backup is no longer 
> proceeding.
> 
> Then perhaps the command "netstat -A | grep '192.168.1.10' |
grep
> 'ESTABLISHED' | grep -v grep" would be helpful.  But in some
cases I
> have found that I have ssh connections to the remote rsync server that 
> obfuscate the rsync ssh ESTABLISH statistics.
If you decide to go this route, you can get the pid of the ssh process
holding the connection by passing --program to netstat and then check
whether its parent (for the local ssh) or child (for the remote ssh) is
an rsync process.

-- 
Matt