[Dirvish] Question about UIDs and GIDs

Joe Aquilina joe_linux at westnet.com.au
Wed Aug 15 03:21:45 UTC 2012

Hello all.

I am relatively new to Linux and even more so to Dirvish. I have 
inherited the admin of a system where some of our machines are backed 
up nightly via dirvish to a central server. The current system has 
been in place for some years and I am just beginning to learn about 
how it all works. We haven't yet had to restore anything yet which is 
good because I am not yet sure of exactly how to do that. 
Experimenting with that on another computer as I type here...

My question relates to UIDs and GIDs of user accounts on the systems 
being backed up. On these systems, there a number of users, some of 
which are duplicated across the various machines, usually with 
different UIDs and/or GIDs on the various machines. These are also 
different to the IDs used on the corresponding accounts on the backup server.

When I look at the backups on the server after they complete, the 
directories &files have the UIDs and GIDS for the accounts as they 
exist on the backup server. These correspond to the numeric IDS from 
the machines that have been backed up.

For example, there may be an account called joe, in group joe on a 
machine to be backed up with a UID of 1002 and a GID of 1003. When 
the backup completes, and I check it, everything has an owner for 
example of central and a group of vince. These correspond to accounts 
on the backup server of central with a UID of 1002 and a GID of 1003. 
Hope this makes sense.

Does this matter? Is there going to be a problem if I restore the 
files back to the original machine? Will the UID & GID revert back to 
joe when the restore is done? Do I need to change anything on the 
system(s) for future backup runs to avoid this?

Do you need any more information (e.g. contents of master.conf, 
default.conf, rsync command for the backup or anything else) to be 
able to assist with this query?

I am hoping I am worrying about nothing but I don't fully understand 
dirvish yet so am a bit apprehensive about changing anything (and 
shudder at the thought of possibly having to change all the UIDs and 
GIDS on the various machines and then changing all the files!) I have 
other dirvish questions but will follow up with those if I can't work 
out an answer for myself. Thanks in advance.

Joe Aquilina

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