[Linux-cluster] Firewall settings

[Troy Dawson]

Hello,
I need to put firewalls on my machines running GFS.  I can't find any 
documentation on what ports are used.  If it's in a document I just 
haven't found, I'd appreciate being pointed to it.
I can do a netstat to find the ports currently being used, but I'm not 
positive if these ports are dynamic, or if they are a range of ports, or 
what.
I am running GFS 6.1, on a RHEL 4 based system.  I am currently using 
the lock_gulmd locking system, but I plan on moving the the dlm based 
locking system, so I'll need it's ports as well.  I have not updated 
currently to the kernel, GFS, and cluster of update 2, but I suspect the 
ports and firewall settings should still be the same.

So it looks like I currently need the ports for
ccsd
rgmanager (clurgmgrd)
lock_gulm
But will later need the ports for
dlm

If I do a netstat I get the following ports
   ccsd
50006 - tcp
50007 - upd
50008 - tcp
50009 - tcp

   rgmanager
41966 - tcp
41967 - tcp
41968 - tcp
41969 - tcp

   lock_gulmd
40040 - tcp
40042 - tcp
41040 - tcp
But on lock_gulmd I also see that these ports are locked to different 
ports on various machines in the cluster.  Such as

tcp 0 0 machine1.here.com:40040      machine2.here.com:32814 
ESTABLISHED 1825/lock_gulmd_cor

So, does that mean that I also have to open port 32814 also, or is that 
tunneled correctly.

Any help is appreciated.
Thanks
Troy Dawson
-- 
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Troy Dawson  dawson at fnal.gov  (630)840-6468
Fermilab  ComputingDivision/CSS  CSI Group
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