Hello,
Some good news for anyone following this issue. ;-)
> On 22 Apr 2020, at 13:38, Pim Rupert <p...@lemonbit.com> wrote:
>
> When it fails, it fails on the rsync_bpc command. With the following error
> (example):
>
> Xfer PIDs are now 31322
> This is the rsync child about to exec /usr/bin/rsync_bpc
> ssh_exchange_identification: Connection closed by remote host
> rsync_bpc: connection unexpectedly closed (0 bytes received so far)
> [Receiver]
>
> This implies something goes wrong with the SSH connection. However, no
> outgoing TCP packets are visible in tcpdump. The error is not reproducible
> when initiated manually from shell or cron, in that case we do see outgoing
> TCP packets and all is well. This is severely odd.
I didn't want to believe there was some magical root cause, so I investigated
further by enabling verbose output for the "ssh" command.
To enable verbose output for the "ssh" command executed by rsync_bpc I added
"-vvv" to the RsyncSshArgs.
This lead to the unraveling of this mystery...
The verbose output of SSH was:
debug1: ssh_exchange_identification: This account is currently not
available.
ssh_exchange_identification: Connection closed by remote host
The reason for this had nothing to do with any "remote host", it was that the
"backuppc" user had no shell configured!
# grep backuppc /etc/passwd
backuppc:x:994:990::/var/lib/BackupPC:/sbin/nologin
After changing the shell to /bin/bash for backuppc, all errors disappeared.
Running backups automatically and from the web application succeeded with the
jump host.
Apparently a shell is required to use a jump host from the ssh command in this
situation?
I will further investigate if this is really required and will report back in
this list.
@Falko: since you got it working without changes, is a shell set for the
"backuppc" user?
Best regards,
Pim Rupert
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