[CentOS] Rsync/SSH automation problem?
Gordon Messmer
yinyang at eburg.com
Fri May 1 16:08:41 UTC 2009
Kai Schaetzl wrote:
>> The second thing you will notice, eventually, is that rsync over ssh
>> under Cygwin is unreliable.
>
> You mean *starting* an rsync operation on that side? Using rsync over ssh
> essentially uses rsync on *both* ends. So, it's running under Cygwin, anyway,
> which makes your statement a bit confusing.
What I mean is that if you launch rsync with something like:
rsync -e ssh server:/path /path
then rsync uses a non-blocking (I said blocking earlier, which was a
mistake) socket pair to communicate with ssh. This may trigger a bug in
cygwin which can cause the application to hang.
If, instead, you run rsync as a daemon on Windows, you can reliably
communicate with the daemon over TCP. This remains true if you use ssh
to forward a port. Thus, I recommend that anyone running rsync on
Windows set up rsync as a daemon that listens for connections on
localhost only and use ssh port forwards to reach it from remote systems.
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