[Csync2] ERROR from peer http0: Identification failed!

[Dennis Schafroth]

Hi, 

I have been hit by this check a couple of times as well. 

My check is whether the hostnames in the config file matches the "uname -n". 

This has worked for me on fedora, opensuse and ubuntu boxes. 

However being a Fedora guy for many years, how to set the hostname on non-fedora boxes is somewhat of a mystery to me. 

I have been thinking about writing a patched to disable this check.  
 
;-Dennis

On 05/02/2011, at 12.38, Alex Cartwright wrote:

>> Both then do a forward lookup of that hostname, and if that does not
>> resolve to the respective remote ip address, that is rejected.
>> 
>> We do that to avoid accidentally syncing with the wrong peer
>> and causing, ahum, major inconvenience.
>> 
>> Depending on your setup, forward lookup usually involves looking
>> at /etc/hosts, so that's why this influences csync2 "authentication".
> 
> I'm still a little confused as to just what exactly it is checking. I'm trying 
> it on a smaller scale here using just 1 peer and lots of debug to see what is 
> going on, but none of it makes sense. 
> 
> This is the output from "example.net":
> 
>    $ hostname; hostname -f
>    example
>    example.net
>    $ grep -E "example|nas0" hosts
>    77.xx.xx.xx    example.net example
>    192.168.0.3     nas0.cluster nas0
>    $ dig +noall +answer example nas0
>    example.                  0       IN      A       77.xx.xx.xx
>    nas0.                   0       IN      A       192.168.0.3
>    $ less csync2.cfg 
>    # please see the REAMDE file how to configure csync2
>    nossl * *;
> 
>    group standard {
>        # Standard group that syncs up common configuration
>        # that generally all our servers will be using.
>        key /etc/csync2.key;
>        auto none;
> 
>        host rrltd;       
>        host nas0;
> 
>        include /etc/csync2.cfg;     
>        include /etc/vim/vimrc;
>    }
> 
> And from "nas0.cluster"
> 
>    $ hostname; hostname -f
>    nas0
>    nas0.cluster
>    $ grep -E "example|nas0" hosts
>    192.168.0.3     nas0.cluster nas0
>    77.xx.xx.xx    example.net example   
>    $ dig +noall +answer example nas0
>    example.                  0       IN      A       77.xx.xx.xx
>    nas0.                   0       IN      A       192.168.0.3
>    $ less csync2.cfg 
>    # please see the REAMDE file how to configure csync2
>    nossl * *;
> 
>    group standard {
>        # Standard group that syncs up common configuration
>        # that generally all our servers will be using.
>        key /etc/csync2.key;
>        auto none;
> 
>        host rrltd;       
>        host nas0;
> 
>        include /etc/csync2.cfg;     
>        include /etc/vim/vimrc;
>    }
> 
> So why on Earth does the following fail?
> 
> $ sudo csync2 -x -P nas0 -vvv /etc/vim/vimrc
> My hostname is example.
> Database-File: /var/lib/csync2/example.db
> Config-File:   /etc/csync2.cfg
> Match (+): /etc/vim/vimrc on /etc/vim/vimrc
> Running check for /etc/vim/vimrc ...
> SQL: SELECT filename from file where filename = '/etc/vim/vimrc'  ORDER BY 
> filename
> SQL Query finished.
> Match (+): /etc/vim/vimrc on /etc/vim/vimrc
> Checking /etc/vim/vimrc.
> SQL: SELECT checktxt FROM file WHERE filename = '/etc/vim/vimrc'
> SQL Query finished.
> SQL: SELECT peername FROM dirty GROUP BY peername ORDER BY random()
> SQL Query finished.
> SQL: SELECT filename, myname, force FROM dirty WHERE peername = 'nas0' ORDER 
> by filename ASC
> SQL Query finished.
> Connecting to host nas0 (PLAIN) ...
> Local> CONFIG \n
> Peer> OK (cmd_finished).\n
> Local> HELLO example\n
> Peer> Identification failed!\n
> While syncing file /etc/vim/vimrc:
> ERROR from peer nas0: Identification failed!
> Local> BYE\n
> Peer> OK (cu_later).\n
> SQL: SELECT command, logfile FROM action GROUP BY command, logfile
> SQL Query finished.
> Finished with 1 errors.
> 
> 
> It makes 100% no sense to me, everything matches up ... or at least I think it 
> does. Any help?
> 
> Regards
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