[StarCluster] using starcluster with a private AMI, ssh passwordless communication between nodes

[Andrea La Rizza]

I'm using starcluster to manage an MPI cluster for parallel scientific 
computation. I don't want to use the pre-installed OpenMPI environment 
since the executables ? have to use are compiled with Intel softwares. 
So I have my private CentOS AMI created from aws console with all the 
Intel environment pre-installed. The problem is that IntelMPI uses by 
default ssh connectivity without password authentication to make nodes 
communicate amoung them to work. I want to know if there is some 
feauture in the config starcluster file such that ssh connectivity intra 
nodes comes pre setted with rsa authentication. I have read that this 
feauture should be enabled by default with the sgeadmin user, but when i 
launch the cluster at a certain point I received this error:

!! ERROR - Error occured while running plugin 
'starcluster.clustersetup.DefaultClusterSetup':
!!! ERROR - Cannot create user: (uid: 0, gid: 0). This is caused by
!!! ERROR - /home/ directory being owned by root. To fix this you'll
!!! ERROR - need to create a new AMI. Note that the instance is still
!!! ERROR - up.
and neither the user sgeadmin is created neither the /etc/hosts file is 
filled with the names and IPs of all nodes of the cluster.
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