Re: [BackupPC-users] Backuppc won't backup a remote system

Hi,

backuppc AT kosowsky DOT org wrote on 2014-05-27 19:30:26 -0400 [Re: 
[BackupPC-users] Backuppc won't backup a remote system]:
> J.L. Blom wrote at about 23:46:43 +0200 on Tuesday, May 27, 2014:
>  > [...]
>  > All,
>  > Thanks for the responses. I'll answer below.
>  > XIN, : Yes I can ssh to the remote system;
>  > DAVID: yes I have to give the password;
>  > TAN: No I logged on as the user on that system with the corresponding 
>  > password;
>  >          Explain MOTD (?);
> Message of the day.

to be a little bit more verbose, for the backup to work, you need to be able
to see the following (the prompt text and exact date/time may differ):

        backuppc@your-backuppc-server% ssh -c blowfish -q -x -l USER SYSTEM date
        Wed May 28 19:36:42 CEST 2014
        backuppc@your-backuppc-server%

If there's any more than that (e.g. password prompt, "last login" line, some
sort of "Welcome to ...", even a blank line or a single space character before
the date), it's not going to work. This is not your current problem, but it
might be the next one to come.

(Disclaimer: if you've got a "command=..." option in your authorized keys,
that probably won't work. But you probably don't. If you don't know what I'm
talking about, just ignore it, it doesn't apply then.)

>  > TAN: I logged on with backuppc and it asked for the password so I think 
>  > that is the problem

Correct.

>  > but how to solve it?

As has been pointed out, there are many guides. In a nutshell, you need an
ssh key (that is *not* protected by a passphrase), that the *backuppc user* on
the *BackupPC server* has access to, and that has permission to login as USER
on SYSTEM (to use the terms from your original mail), i.e. the public key needs
to be in SYSTEM:~USER/.ssh/authorized_keys (see sshd(8) for details).

> How would you expect BackupPC to possibly log on to the client if it
> requires a password? BackupPC does not magically 'crack' passwords or
> hack its way onto your machine...

Feature request? ;-)

> It's also customary to read the instructions and/or FAQ before
> bombarding the whole list with questions

Actually, the list bombarded him with questions :-). But yes, the first
(obviously off-list) reply did contain the correct information. Saying "no,
that's not it", when it actually is, makes helping a little difficult ...

Regards,
Holger

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