[Beowulf] running out of rsh ports
lindahl at pathscale.com
Thu May 4 15:53:57 PDT 2006
On Wed, May 03, 2006 at 12:16:03PM -0500, Bruce Allen wrote:
> rsh typically uses ports in the 513-1023 range. With a 640 node cluster
> we are running out of ports. This leads to messages such as:
> "rcmd: socket: All ports in use"
> Are there any standard solutions to this other than 'use ssh'? We already
> have net.ipv4.tcp_tw_recycle = 1 in /etc/sysctl.conf
As another amusing example of this, PBS before the tm interface
(~1999) used a low port to contact Moms, so it was easy to run out.
So I lowered the TIME_WAIT on the PBS master node.
(don't try this at home unless you're a trained expert in network perversions...)
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