#! /bin/bash

# Launch this script as $user in the frontend to configure passwordless ssh to-and-fro the frontend and all nodes in the cluster for the $user
## Generate two files, id_rsa and id_rsa.pub, in /share/home/$user/.ssh in the current compute node

userhome=$(echo $HOME)

#1a
if [[ -e $userhome/.ssh/id_rsa.pub ]]; then echo "pub rsa exists. Will not creat any."; else ssh-keygen -t rsa; fi

HOSTNAME=$(cat /etc/hostname)
hosts=$(cat /etc/hosts | grep 192 | awk {'print $1}')
for rn in $hosts
do
### 1b copy the rsa key of the $user in the current node to the remote node
	ssh-copy-id -i $userhome/.ssh/id_rsa.pub $rn

### 2a remotely generates the rsa key for the $user in the rn by ssh-ing from the current compute node.
	ssh $user@$rn "if [[ -e ~/.ssh/id_rsa.pub ]]; then  echo "pub rsa exists. Will not creat any"; else ssh-keygen -t rsa; fi"

### 2b remotely asks the rsa key for the $user in the rn to be copied via ssh to the current compute node. 
	ssh $user@$rn "ssh-copy-id -i $userhome/.ssh/id_rsa.pub $HOSTNAME"
done