silly rsync question

markie83 · 02-08-2018, 12:21 PM

I am making 2 identical offsite backup servers that are using SSH+CRON+Rsync to backup alot of data from our hosted server. I already have one made and fully functional.....I am setting up the second one and just wanted to know if I can copy all the data from the first backup server to the second one before pointing its Rsync at the main server???? Or will it redownload everything from the hosted server since the files might not appear to be the same to Rsync?

ludist · 02-08-2018, 03:13 PM

rsync does not have a 'magical' database of what is copied, it just copies files. So your first idea is valid. Copy from 1st backup to 2nd backup and you can send the 'master' server files to 2nd backup.

BW-userx · 02-08-2018, 03:22 PM

https://www.tecmint.com/copy-files-t...linux-servers/

Pscp – Transfer/Copy Files to Multiple Linux Servers Using Single Shell

markie83 · 02-08-2018, 03:29 PM

Quote:

Originally Posted by ludist

rsync does not have a 'magical' database of what is copied, it just copies files. So your first idea is valid. Copy from 1st backup to 2nd backup and you can send the 'master' server files to 2nd backup.

my backup servers are pulling from the main server(the server is not pushing to the backups)

chrism01 · 02-08-2018, 09:14 PM

Same difference

Essentially, rsync checksums src and target and sends diffs.
For brand new files of course, diff = 100%; everything else will be 'less'.
Just ensure you have all the metadata (eg ownerships, perms etc.) the same if that is what you normally specify in the current backups.

JJJCR · 02-09-2018, 03:28 AM

Agree with Chris on this, rysnc will just check for difference.

The best way for you to experiment is to simulate your scenario with a few files, then do an rsync. Check the files and see if it is what you expect to behave.

Of course, your provide the rsync options properly. rsync -ravzhX this would be ideal I think. man rsync to check rsync parameters.

Check out this link: http://www.admin-magazine.com/Articl...nc-for-Backups

Don't try anything at the production level, unless you have done some testing. Good luck!