James Kyle wrote on 2008-08-06 12:19:38 -0700 [[BackupPC-users] userid mismatch error...though uid's are not wrong]:

I'm getting a userid mismatch error using mod_perl and a specialized  

httpd daemon run as the backppc user.

your error message seems to indicate that it is not related to the web server.

If my backuppc user has uid 300, the error reads as follows:

/usr/local/BackupPC/bin/BackupPC_dump: Wrong user: my userid is 300,  

instead of  (backuppc)

As I mentioned, the backuppc uid *is* 300.

First of all, what version of BackupPC are you running?

The 3.1.0 sources indicate that there *should* be a user id before the
"(backuppc)" in the error message. It is empty, so "getpwnam ('backuppc')"
failed - which is strange, to say the least.

What do the relevant lines of nsswitch.conf look like
("egrep 'passwd|shadow' /etc/nsswitch.conf")?

Could you give us some more information on your OS environment?

So I'm a bit confused at  

what is going on. In addition, I can restart the BackupPC daemon and  

initialize a backup and it completes without error...then after a  

while, this error arises and will not go away.

Are you using some strange ulimits? SElinux? Can you tell if the time until it
reappears is "about the same" or very random (actually, the count of processes
started by the BackupPC daemon - assuming they all "use Lib;" - would be the
interesting figure, but that's hard to count)?

You might try setting DumpPostUserCmd to '/usr/bin/id -a' (unless you're
already using it; DumpPostShareCmd will do just as well or either of the Pre
commands, though Post would be better). Does 'id' start having the same
problems at the same time? Are there better diagnostics from 'id' as to the
cause?

2008-08-11 10:41:04 User jkyle requested backup of mscohen (mscohen)

2008-08-11 10:41:04 Started incr backup on mscohen (pid=51279, share=/Users)

2008-08-11 10:42:10 jkyle changed DumpPreUserCmd in main config to '/usr/bin/id -a' from undef

2008-08-11 10:42:10 Reloading config/host files via CGI request

2008-08-11 10:42:10 Next wakeup is 2008-08-11 11:00:00

2008-08-11 10:42:17 Stopping current incr of mscohen, request by jkyle (backoff=)

2008-08-11 10:42:22 Backup canceled on mscohen (aborted by user (signal=INT))

2008-08-11 10:42:48 User jkyle requested backup of mscohen (mscohen)

2008-08-11 10:42:48 Started incr backup on mscohen (pid=51291, share=/Users)

2008-08-11 10:45:53 User jkyle requested backup of arne (arne)

2008-08-11 10:45:55 Started incr backup on arne (pid=51306, share=/Users)

Regards,
Holger