SSH Notes

In order to facilitate 'roaming' around the nodes in the cluster we have a passphrase-protected ssh key for root's and trteam's accounts on lcfg.  This allows us to do in a session a single passphrase authentication for all nodes accessed from a central host.  To roam, do the following:

1. First ssh onto the cluster from your desktop
2. Launch an ssh agent:
   # eval `ssh-agent`

   Agent pid 4555

3. Add the default identity
   # ssh-add

   Enter passphrase for /root/.ssh/id_dsa: 
   Identity added: /root/.ssh/id_dsa (/root/.ssh/id_dsa)

4. Example roaming:
   # for i in `seq 1 4` ; do
    echo -n "wn00$i ":
    ssh root@wn00$i date
   done

   wn001 :Thu Feb 24 15:44:33 PST 2005
   wn002 :Thu Feb 24 15:44:33 PST 2005
   wn003 :Thu Feb 24 15:44:33 PST 2005
   wn004 :Thu Feb 24 15:44:34 PST 2005