Mailing List Archive: High Availability SSH Server

High Availability SSH Server

Mar 2, 2010, 1:44 PM

Post #1 of 3 (3671 views)

Hi,

I am trying to setup a highly available ssh server on Linux (probably
CentOS 5.4) , i.e. 2 nodes with a floating IP address, if one node
fails then the IP address will move over and sessions will continue
working. I am comfortable with using heartbeat and DRBD to to share
data and manage the floating IP address but wondered if there is any
way of having ssh share session / connection status across 2 nodes. I
may end up achieving this by running the ssh server in a VM (using
Linux and Xen) and migrating that instead but would rather avoid the
over heads.

I believe the current version of ssh from CentOS (and RedHat) is
openssh-4.3p2-36.el5.i386.rpm) but would be happy to compile a version
from source to meet my requirements.

I am aware that there is an appliance from ssh that can do this and
wondered if openssh was also capable of a high availability cluster
set up.

Any thoughts appreciated

Mark Reynolds

Re: High Availability SSH Server [ In reply to ]

td3201 at gmail

Mar 4, 2010, 10:12 AM

Post #2 of 3 (3539 views)

Permalink

On Tue, Mar 2, 2010 at 3:44 PM, Mark Reynolds <mark@sparkyone.com> wrote:
> Hi,
>
> I am trying to setup a highly available ssh server on Linux (probably
> CentOS 5.4) , i.e. 2 nodes with a floating IP address, if one node
> fails then the IP address will move over and sessions will continue
> working. I am comfortable with using heartbeat and DRBD to to share
> data and manage the floating IP address but wondered if there is any
> way of having ssh share session / connection status across 2 nodes. I
> may end up achieving this by running the ssh server in a VM (using
> Linux and Xen) and migrating that instead but would rather avoid the
> over heads.
>
> I believe the current version of ssh from CentOS (and RedHat) is
> openssh-4.3p2-36.el5.i386.rpm) but would be happy to compile a version
> from source to meet my requirements.
>
> I am aware that there is an appliance from ssh that can do this and
> wondered if openssh was also capable of a high availability cluster
> set up.
>
> Any thoughts appreciated
>
> Mark Reynolds
>

Linux clustering project should allow for the transition of an ssh
service between nodes using a single IP address. Your resources are
the IP and the SSH service. You may want to consider using a shared
disk and storing the SSH config and any keys centrally but not
required.

Re: Re: High Availability SSH Server [ In reply to ]

mark at sparkyone

Mar 4, 2010, 11:38 PM

Post #3 of 3 (3511 views)

Permalink

Thank you for all your suggestions, I'll keep investigating.
Keepalived sounds particularly interesting.

Thanks again,

Mark

On Thu, Mar 4, 2010 at 10:41 PM, Marco Vannini <marco.vannini@gmail.com> wrote:
> Keepalived?
>
> Il giorno 04/mar/2010 23:39, "Terry" <td3201@gmail.com> ha scritto:
>
> On Tue, Mar 2, 2010 at 3:44 PM, Mark Reynolds <mark@sparkyone.com> wrote:
>> Hi,
>>
>> I am trying to s...
>
> Linux clustering project should allow for the transition of an ssh
> service between nodes using a single IP address. Your resources are
> the IP and the SSH service. You may want to consider using a shared
> disk and storing the SSH config and any keys centrally but not
> required.
>