You need to set up ip masq on he head node so that it knows how to route
outside signals to the compute nodes.
OSCAR does not do this.
Here is a howto on the subject:
http://www.linux.org/docs/ldp/howto/IP-Masquerade-HOWTO/index.html
On Fri, Jun 27, 2008 at 7:00 AM, Michael Oevermann <
[EMAIL PROTECTED]> wrote:
> Hi,
>
> we have a problem with login to the nodes via ssh. We have some "normal"
> users on the head node with
> their home directories under
> /home/<username>,
> but most users have their home directories mounted from a different
> machine - lets call it nfshome with IP 130.xxx.xxx.xxx - to
> /Users/<username>
> on the headnode.
>
> Both, the head node and the nodes itself have the following line in
> their /etc/fstab
>
> 130.xxx.xxx.xxx:/Volumes/XRaid00/users /Users nfs
> defaults 0 0
>
> The nodes also have the line
>
> nfs_oscar:/home /home nfs rw 0 0
>
>
> The nodes are able to automount the user home directories sitting
> directly on the
> head node (/home/<username>) and those users can access the nodes via
> ssh without
> passwd.
>
> However, the nodes fail to mount the nfs mounted home directories
> 130.xxx.xxx.xxx:/Volumes/XRaid00/users. The error in boot.log is, e.g.,
>
> Jun 26 18:32:23 n01 mount: mount: mount to NFS server '130.xxx.xx.xx'
> failed: System Error: Connection timed out
>
> I wonder how this can work at all. The head node and the nfshome machine
> both have public IP's 130.xxx.xxx.xxx
> so it is no problem for the head node to mount the user home directories
> from nfshome.
> However, the nodes are not connected to the public net, they sit - as
> usual - in a subnet 192.168.100.xxx
> connected to the headnode.
> From the nodes itself it is even impossible to ping the nfshome machine
> which means that a
>
> mount -t nfs 130.xxx.xxx.xxx:/Volumes/XRaid00/users /Users
>
> on the nodes is not possible.
>
> Question: What is the correct setup (on head node and/or nodes) that the
> nodes
>
> a) mount the user home directories 30.xxx.xxx.xxx:/Volumes/XRaid00/users
> under /Users
> b) users can access the nodes via ssh (I assume if a) is fixed b) is
> fixed as well)
>
>
>
> Thanks for any help!
>
> MIchael
>
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