[Beowulf] Cannot use more than two nodes on cluster

Greg Keller Greg at Keller.net
Wed Sep 19 20:42:55 PDT 2012

I am going to bet $0.25 that SSH or TCP/IP is configured to allow the
master to get to the nodes without a password, but not from one Compute to
the other Compute.

Test by sshing to Compute1, then from Compute1 to Compute2.  Depending on
how you built the cluster, it's also possible there is iptables running on
the compute nodes but, my money is on the ssh keys need reconfiguring.  Let
us know what you find.


Date: Wed, 19 Sep 2012 16:11:21 +0000

> From: Antti Korhonen <akorhonen at theranos.com>
> Subject: [Beowulf] Cannot use more than two nodes on cluster
> To: "beowulf at beowulf.org" <beowulf at beowulf.org>
> Message-ID:
>         <B9D51F953BEE5C42BC2B503D288542992DD935FE at SRW004PA.theranos.local>
> Content-Type: text/plain; charset="us-ascii"
> Hello
> I have a small Beowulf cluster (master and 3 slaves).
> I can run jobs on any single nodes.
> Running on two nodes sort of works, running jobs on master and 1 slave
> works.
> (all combos, master+slave1 or master+slave2 or master+slave3)
> Running jobs on two slaves hangs.
> Running jobs on master + any two slaves hangs.
> Would anybody have any troubleshooting tips?
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