Grant,
I just read through the ltsp-update-sshkeys script, and (aside from it
needing some love), it looks like in order for ltsp-update-sshkeys to
include the extra keys for the other servers, you need to save those
keys on the ltsp server in: /etc/ltsp/ssh_known_hosts.myname (where
"myname" can be replaced with any name you find would help you remember
what keys are in that file - and you can have multiple files of that
type).
Now, interestingly, ltsp-updates-sshkeys has a --export option to export
the keys of the ltsp server to a file, presumably for this purpose. But,
this puzzles me, because you don't want the LTSP server's keys, you want
the application servers' keys. Which, I suppose means you could copy
ltsp-update-sshkeys to your app servers to export things, but this is
clumsy.
We *should* make it so that I can pass ltsp-update-sshkeys --export
<filename> [IP-of-app-server] and have the script use ssh to request
the public key of the app server and store that in the file. I will add
it to a TODO for now.
But, in answer to your keys question, I would go ahead and put the keys
on the ltsp server in /etc/ltsp/ssh_known_hosts.myname, rerun
ltsp-update-sshkeys and ltsp-update-image. Then, you can test it by
dropping to a shell on the thin client and attempt an ssh to the app
server. If all goes well, you should NOT be asked to accept the
authenticity of the host.
HTH,
-Gadi
On Tue, 2010-02-02 at 14:42 -0600, grant wrote:
> Hi all,
>
> I have been trying to set up LDM load balancing between two servers
> running ubuntu 9.04 for a couple of days and have failed. I was
> following the instructions in the ltsp Manual, #ltsp and information I
> found around but did not get there really.
>
> I found out that the get_hosts script needs to be located at
> /opt/ltsp/i386/usr/lib/share/get_hosts so fixed that, The following is
> my lts.conf and my get_hosts script. For my testing purposes I have
> been loading the results so that the 10.0.0.46 server is returned by the
> script. The test client I am booting is only listed in the 10.0.0.32
> servers dhcp. So I basically want to be able to send a client to the
> least conjested server and only have that information in one servers
> dhcpd.conf file.
>
> /var/lib/tftpboot/ltsp/i386/lts.conf
>
> [Default]
> LDM_DIRECTX=True
> LDM_SESSION=/usr/bin/startkde
> SOUND = Y
> NBD_SWAP=True
> DNS_SERVER="10.0.0.38 10.0.0.39"
> SEARCH_DOMAIN="ajrs.com"
> MY_SERVER_LIST="10.0.0.32 10.0.0.46
>
> /opt/ltsp/i386/usr/lib/ltsp/get_hosts
>
> #!/bin/bash
> # Takes a list of servers from the /var/lib/tftpboot/ltsp/i386/lts.conf
> and sorts that
> # list based on the output of the nc rating of that server.
> TMP_LIST=""
>
> for i in $MY_SERVER_LIST; do
> let "rank = `nc $i 9571 | grep rating | cut -d: -f2`"
> TMP_LIST="$TMP_LIST\n${rank}_$i"
> done
> echo -e $TMP_LIST | sort -r | cut -d_ -f2
>
> After making these changes I made sure the script was executable(set
> 755) and called a ltsp-update-image -a i386 on my servers, of course
> after making edits in chroot.
>
> This left me at the point where I think the script is running and
> returning the proper information. I am able to get to an ldm and enter
> a username and password. The screen goes blank immediatly and then goes
> back to the ldm. I got this far by doing some ssh-key work on Gadi from
> #ltsp's advice.
>
> I did a sudo chroot /opt/ltsp/i386
>
> then I would ssh to the host I wanted to be able to connect to accept
> the keys and then logout chroot and sudo ltsp-update-sshkeys and
> ltsp-update-image -a i386
>
> When I am doing this I watch the syslog on the server I want to connect
> to 10.0.0.46 and can see two connection attempts from the client and
> that is all.
>
> Feb 2 14:41:28 ltsp2 ldminfod[16901]: connect from 10.0.2.4 (10.0.2.4)
> Feb 2 14:41:28 ltsp2 ldminfod[16904]: connect from 10.0.2.4 (10.0.2.4)
>
>
> Does anyone have any idea what I am doing wrong here. I personally am
> not sure if I did the ssh keys properly but I know no other way.
>
> Thank you.
>
> Grant
>
>
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--
--------------------------------------------------------
Gideon Romm | Proud LTSP Developer
l...@symbio-technologies.com
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------------------------------------------------------------------------------
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Stay online with enterprise data centers and the best network in the business
Choose flexible plans and management services without long-term contracts
Personal 24x7 support from experience hosting pros just a phone call away.
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