Running BridgeServers for ag-2 and vv2

[Thomas D. Uram]

Starting BridgeServers
======================

BridgeServers for ag-2 and vv2 are run on the machine named ag-tech. 
Scripts to start them reside in /home/ag, and are named StartBridge_ag2 
and StartBridge_vv2.  I usually start them in a screen session.

StartBridge_ag2 runs the BridgeServer.py script in the current 
directory, using the config file ag2bridge.cfg, which bridges the entire 
ag-2 server.

StartBridge_vv2 also uses the current-directory BridgeServer.py script, 
using the config vv2bridge.cfg, which bridges the venues listed in the 
vv2bridge.venues file.  These venues are on the AG wiki here:

http://www-unix.mcs.anl.gov/fl/research/accessgrid/wiki/moin.cgi/BridgedVenues


Stopping BridgeServers
======================

If, for some reason, the bridges need to be restarted, you can re-enter 
the screen session in which StartBridge_??? was started and Ctrl-C. 
This often takes waaay too long (fixed in 2.2), so you'll want to kill 
the processes.

You should make sure the python BridgeServer.py processes and related 
QuickBridge processes all die, without killing processes that belong the 
other bridge server.  You can do this through the process group id:

ps -eo pgrp,args|grep Bridge

will show you all the BridgeServer and QuickBridge processes with their 
process group id.  From the argument lists, you should be able to 
distinguish the ag-2 from the vv2 bridge processes, and kill the 
appropriate process group:

sudo kill -9 -pgid

Since the vv2 BridgeServer uses static ports for the bridges, if a 
QuickBridge process is left running through a restart, when you try to 
run the BridgeServer again, you'll see output that indicates that 
QuickBridge failed to start because it couldn't open a port (note the 
last line):


   max_unicast_mem is 32
   myhostname=ag-tech.mcs.anl.gov
   myhostipaddress=140.221.9.160

   using multicast
   ucport[data]=58688  ucport[rtcp]=58689
   mcport[data]=60750  mcport[rtcp]=60751
   can't bind ucaddr to socket!: Address already in use



I'll put this information in a conspicuous place (internal wiki?) later, 
so it's readily referrable.  This is obviosuly not a polished doc, but I 
hope I've captured what's needed.

Tom