Secure Shell
High Availability SSH Server Mar 02 2010 09:44PM
Mark Reynolds (mark sparkyone com) (1 replies)
Re: High Availability SSH Server Mar 04 2010 06:12PM
Terry (td3201 gmail com)
On Tue, Mar 2, 2010 at 3:44 PM, Mark Reynolds <mark (at) sparkyone (dot) com [email concealed]> 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

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