I have a very basic postfix/dovecot server, with just a few users, and
it works. But in the past I have had hardware failures…so I would like
use dsync to a nearly matching server for some extra safety, and I have
not yet been successful.
I am trying to do this as root over ssh, with a private key for
authentication.
I do not managed to get the whole replicator thing working, so as part
of simplifying things I am trying to run dsync manually, just on one
user (myself). I hope this isn't a silly approach.
What would the manual command look like? The closest example on the man
page is:
$ doveadm sync -u usern...@example.com ssh -i id_dsa.dovecot \
mailu...@example.com doveadm dsync-server -u usern...@example.com
I try to change that to match my case and it has never heard of me:
root@la:/etc/dovecot# doveadm sync -1 -u kentb...@mail.borg.org ssh -i
/root/.ssh/id_rsa_rc.borg.org.dsync kentb...@mail.borg.org doveadm
dsync-server -u kentb...@mail.borg.org
doveadm(kentb...@mail.borg.org): Error: User doesn't exist
root@la:/etc/dovecot#
I drop the machine part of the name and it knows who I am on this end
but can't get to the other end:
root@la:/etc/dovecot# doveadm sync -1 -u kentborg ssh -i
/root/.ssh/id_rsa_rc.borg.org.dsync kentb...@mail.borg.org doveadm
dsync-server -u kent\
b...@mail.borg.org
kentb...@mail.borg.org's password:
I think I have root's ssh keys set up correctly, I can run this:
root@la:/etc/dovecot# ssh -i /root/.ssh/id_rsa_rc.borg.org.dsync
mail.borg.org
PTY allocation request failed on channel 0
C-c C-croot@la:/etc/dovecot#
…and on the remote end I see some debugging output I put in the remote
script, outputting an empty username. Makes sense.
If I try to put that in this (incomplete) dsync command:
root@la:/etc/dovecot# doveadm sync -u kentborg -1 ssh -i
/root/.ssh/id_rsa_rc.borg.org.dsync mail.borg.org
Error: Extraneous arguments found: 3 5
doveadm(kentborg)<1029674><QvOnDPmKkmcqtg8AA8+vgQ>: Error:
read(remote) failed: EOF (version not received)
doveadm(kentborg)<1029674><QvOnDPmKkmcqtg8AA8+vgQ>: Error: Remote
command returned error 64: ssh -i /root/.ssh/id_rsa_rc.borg.org.dsync
mail.borg\
.org dsync-server
root@la:/etc/dovecot#
And the remote end outputs the username as "VERSION dsync 3 5", okay,
maybe progress.
But when I try to make the command more complete and send a username to
the remote end, and now I am no longer talking to the remote end:
root@la:/etc/dovecot# doveadm sync -u kentborg -1 ssh -i
/root/.ssh/id_rsa_rc.borg.org.dsync remotepre...@mail.borg.org
remotepre...@mail.borg.org's password:
Suggestions?
Thanks,
-kb
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