[Linux] rsync/ssh question

[Kwan Lowe]

>> Is there a way to do this directly with rsync over ssh? Suggestions?
>
> If you can ssh from HostA to HostB and from HostB to HostC, then you can
> create an ssh tunnel from HostA to HostC via HostB.
>
> For example, establish an ssh tunnel like so:
>
> $ ssh -2 -N -L 12345:$HostC:22 $UserB@$HostB
>
> After you type in your password, push the tunnel into the background
> with Ctrl-Z followed by 'bg'.  Start your rsync:

Using your suggestion, I'd started going along this route. The script I wrote was:

#!/bin/sh
set -x

DMZ_HOST=illusion
JUMP_HOST=janus
LOCAL_PORT=30000
LOCAL_ALIAS=local-alias
SOURCE=foo
DESTINATION=/tmp/foo2

echo nohup ssh -2 -N -L ${LOCAL_PORT}:${DMZ_HOST}:22 ${JUMP_HOST} &
# tba - check if tunnel exists (can bind to LOCAL_PORT)
nohup ssh -2 -N -L ${LOCAL_PORT}:${DMZ_HOST}:22 ${USER2}@${JUMP_HOST} &

rsync -a -e "ssh -p ${LOCAL_PORT}" ${SOURCE} ${LOCAL_ALIAS}:${DESTINATION}

A problem occured when I tried to connect on the local port. My known_hosts file
thinks that it's connecting locally so checks against the localhost key versus
HostC. This caused the second SSH connection to fail (Man In the Middle warning).

I copied the HostC known_host entry from HostB to HostA and renamed the hostname.
This got past the error...  Still have to work out a few bugs but I think it'll get
there.

Thanks much!

>
> $ rsync -e "ssh -p 12345" $source $UserC@localhost:$destination_path
>
> That is just one of several ways.
>
> Good luck and please post back letting us know how it went.

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