rsync to mirror two servers

[StargazeR82]

I hear that you can use rsync to mirror two servers to create a redundant system. Is this true? And if so could someone give me an example how they have done it in the past? These are two cobalt raq4 web servers.

 

[LGTObug]

I mirror a directory between my "old" and "new" ftp sites with the command:
rsync -az -e ssh --delete ~ftp/pub/samba/ nimbus:"~ftp/pub/tridge/samba"

this is launched from cron every few hours.

I also would suggest "man rsync"

regards

 

[StargazeR82]

Ok, I read the man page and some examples and I understand about how to sync a coupla' folders. But what about the whole entire filesystem? Is that possible? What about copying the OS while it is running? Could that even be possible? Or will it only work for folders and files not in use?