[torqueusers] Torque and Reserved Ports

Jason Williams jasonw at jhu.edu
Mon Jan 5 13:02:10 MST 2009

Hello All,
I've spent some time googling around for an answer to this, and not 
really found one.  I have, however, found of several people complaining 
of the same issue.   The problem I am having is that my pbs_server 
machine seems to be running out of available reserved ports (ports < 
1024).  I've actually traced the issue to what looks like outgoing 
communications to all my pbs_mom instances on my compute nodes.  It 
seems that the server is using a reserved port on the local side of the 
connection, and then, for some reason, the connection drops into 
TIME_WAIT and sits there when I examine netstat.  The cluster has about 
120 nodes on it, so the reserved ports can fill up quite fast causing 
all automounted NFS mounts to basically die.

I've searched this list's archives with the search function on the 
mailing list page and didn't really come up with anything.  So I am 
wondering if anyone else has seen this and has a possible solution?  Any 
suggestions are welcome as it's causing my users some significant 
amounts of grief. 

I'm also kind of curious to know if any one happens to know why what 
looks like an out going connection is using a reserved port on the local 
side.  That strikes me as a bit odd, but I'm sure there's a good reason 
for it.

Jason Williams
Systems Administrator
Johns Hopkins University
Physics and Astronomy Dept.

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