Ubuntu – Synchronize Files on Multiple Servers (rsync?)

apache-2.2rsyncsynchronizationUbuntu

I have a clustered Ubuntu server layout. Is there a way to configure filesystem synchronization only when a change is made/file is modified (to save resources)?

Best Answer

You could use rsync, but why not make /home an NFS share? rsync only sends changed files.

As a side note, only having a single load-balancer causes you to have a single point-of-failure (SPOF). You might want to get another one in there...

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Finding out what user Apache is running as

ps aux | egrep '(apache|httpd)' typically will show what apache is running as.

Usually you do not need to change the default user, "nobody" or "apache" are typically fine users. As long as its not "root" ;)

edit: more accurate command for catching apache binaries too

Linux – How to Show Total Progress in Rsync

There is now an official way to do this in rsync (version 3.1.0 protocol version 31, tested with Ubuntu Trusty 14.04).

#> ./rsync -a --info=progress2 /usr .
    305,002,533  80%   65.69MB/s    0:00:01  xfr#1653, ir-chk=1593/3594)

I tried with my /usr folder because I wanted this feature for transferring whole filesystems, and /usr seemed to be a good representative sample.

The --info=progress2 gives a nice overall percentage, even if it's just a partial value. In fact, my /usr folder is more than 6 gigs:

#> du -sh /usr
6,6G    /usr/

and rsync took a lot of time to scan it all. So almost all the time the percentage I've seen was about 90% completed, but nonetheless it's comforting to see that something is being copied :)

References:

Best Answer

Related Solutions

Finding out what user Apache is running as

Linux – How to Show Total Progress in Rsync

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