Made ipcluster not use security by default. We need to revist this as ipcluster will

eventually need security.  But for now this should be fine as ipcluster only
really works for starting things on localhost.

IPython/kernel/scripts/ipcluster.py

@@ -190,7 +190,7 b' def clusterLocal(opt,arg):'
         logfile = pjoin(logdir_base,'ipcluster-')
 
     print 'Starting controller:',
-    controller = Popen(['ipcontroller','--logfile',logfile])
+    controller = Popen(['ipcontroller','--logfile',logfile,'-x','-y'])
     print 'Controller PID:',controller.pid
 
     print 'Starting engines:   ',
@@ -199,7 +199,8 b' def clusterLocal(opt,arg):'
     englogfile = '%s%s-' % (logfile,controller.pid)
     mpi = opt.mpi
     if mpi: # start with mpi - killing the engines with sigterm will not work if you do this
-        engines = [Popen(['mpirun', '-np', str(opt.n), 'ipengine', '--mpi', mpi, '--logfile',englogfile])]
+        engines = [Popen(['mpirun', '-np', str(opt.n), 'ipengine', '--mpi', 
+            mpi, '--logfile',englogfile])]
         # engines = [Popen(['mpirun', '-np', str(opt.n), 'ipengine', '--mpi', mpi])]
     else: # do what we would normally do
         engines = [ Popen(['ipengine','--logfile',englogfile])

IPython/kernel/scripts/ipengine.py

@@ -69,7 +69,7 b' def start_engine():'
         except:
             mpi = None
     else:
-        mpi = mpi_namespace.get('mpi')
+        mpi = None
     
     # Start logging
     logfile = kernel_config['engine']['logfile']

docs/source/changes.txt

@@ -33,6 +33,10 b' New features'
 	* String lists now support 'sort(field, nums = True)' method (to easily
 	  sort system command output). Try it with 'a = !ls -l ; a.sort(1, nums=1)'
 	* '%cpaste foo' now assigns the pasted block as string list, instead of string
+	* The ipcluster script now run by default with no security.  This is done because
+	  the main usage of the script is for starting things on localhost.  Eventually
+	  when ipcluster is able to start things on other hosts, we will put security
+	  back.