= How to run R-MPI on multiple machine with normal user permission =

== Issue description ==

 * We found that if we run mpd with superuser privilege (i.e. root permission), normal user in each node can not connect to mpd to run R-MPI.
   * First, we had finished the ip and hostname mapping by modifying /etc/hosts, and then use scp to exchange ssh public key to each compute node.
{{{
bio-cluster-12:~# cat /etc/hosts
X.X.X.12 bio-cluster-12
X.X.X.11 bio-cluster-11
X.X.X.10 bio-cluster-10
X.X.X.9  bio-cluster-09
X.X.X.8  bio-cluster-08
X.X.X.7  bio-cluster-07
X.X.X.6  bio-cluster-06

bio-cluster-12:~# for i in 11 10 09 08 07 06; do scp .ssh/id_rsa.pub bio-cluster-$i:.ssh/authorized_keys; done
}}}
   * We had created the same mpd.conf in each node
{{{
bio-cluster-12:~# cat > /etc/mpd.conf << "EOF"
> secretword=this_is_password
> EOF

bio-cluster-12:~# for i in 11 10 09 08 07 06; do scp /etc/mpd.conf bio-cluster-$i:/etc/.; done
}}}
   * The mpd.hosts file is as following:
{{{
bio-cluster-12:~# cat mpd.hosts
bio-cluster-11
bio-cluster-10
bio-cluster-09
bio-cluster-08
bio-cluster-07
bio-cluster-06
}}}
   * run mpdboot with superuser privilege
{{{

}}}
 * Reference Solution: [http://structbio.vanderbilt.edu/comp/soft/amber/start.php Getting started with AMBER]

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