Re: using ssh in a clustered environment

From: Jim Prewett (
Date: 12/24/03

  • Next message: S.Palanisaravanan: "differnce between SCP and SSH"
    Date: Tue, 23 Dec 2003 16:40:06 -0700 (MST)


    I run a 256 node cluster. We consider the cluster to be one machine and
    therefore give each host the same hostkey. There definantly would be the
    possibility of one machine playing the middleman, but realistically if you
    have root on one of them you will sooner or later have root on all of them
    anyway.... This setup also greatly simplifies key managment for us.

    hope this helps,

    On Tue, 23 Dec 2003 wrote:

    > I am using OpenSSH in a clustered environment. There are two hosts, each
    > with its own hostname and IP address. Then there is a 3rd hostname & IP
    > address, actually a "virtual hostname/ip address". This third hostname is
    > associated with an application and it can move from host to host. E.g.,
    > normally the VIP address is configured on hostA; when hostA fails, it is
    > moved to hostB. The SSH problem is that I want to connect to the VIP /
    > Vhostname. When the virtual hostname moves hostA to hostB, I get the 'man
    > in the middle' error. Is there a way around this ?

    James Prewett
    Systems Team Leader			Designated Security Officer
    HPC Systems Engineer III @ HPC@UNM --

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