topic Re: High availability SSH server in Operating System - Linux

High availability SSH server

Rui Vilao — Mon, 30 Jan 2006 09:52:20 GMT

Greetings,

I was ask to setup a HA server under RHEL 4.0.
I was wondering if it is possible to achieve this without using a clusterware like cluster suite.

Any help/suggestion is highly appreciated.

TIA.

Kind Regards,

Rui Vilao.

Re: High availability SSH server

Ivan Ferreira — Mon, 30 Jan 2006 10:12:18 GMT

I think that heartbeat is the software that you need. Provides single IP and failover capabilities. Check the page:

http://www.linux-ha.org/HomePage

Re: High availability SSH server

Steven E. Protter — Mon, 30 Jan 2006 10:28:07 GMT

Shalom,

HA without clustering.

I would suggest two machines, in two physical locations if possible.

You'd have to have a DNS server constantly check the availability of both machines. If one machine fails to respond to ssh and ping then the DNS record or zone database of the domain can be swapped out and the name, say sshserver will become active.

Your check script is important. If it uses ssh to check connectivity, as it should there can be a delay of 30 seconds on failover. You may be able to shorten that with ssh command line options.

BTW RH 4 clustering, which I've recently become proficient in, does not require shared storage and is rather easy to configure to do this task more reliabily.

SEP

Re: High availability SSH server

Rui Vilao — Mon, 30 Jan 2006 12:13:59 GMT

Hi all,

Thanks a lot for your contributions!

Steven, what RH 4 clustering are you referring to? I believe Red Hat Cluster Services require shared storage at least for the quorum partitionâ ¦

TIA,

Kind Regards,

Rui.

Re: High availability SSH server

Ivan Ferreira — Mon, 30 Jan 2006 12:59:40 GMT