#! /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

userhome=$(echo $HOME)

echo 1 Generate two files, id_rsa and id_rsa.pub, in $HOME/.ssh in the node $(hostname)
if [[ -e $userhome/.ssh/id_rsa.pub ]]; then echo "pub rsa exists. Will not creat any."; else ssh-keygen -t rsa; fi

/share/apps/local/bin/coc-sshreachable
hosts=$(cat /share/tmp/ssh-reachable.dat)

for rn in $hosts
do
	echo 2 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

	echo 3 remotely generates the rsa key for the $user in the rn by ssh-ing from the current compute node.
	ssh -oStrictHostKeyChecking=no $rn "if [[ -e $HOME/.ssh/id_rsa.pub ]]; then  echo "pub rsa exists. Will not creat any"; else yes '' | ssh-keygen -t rsa; fi"

	echo 4 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 $HOME/.ssh/id_rsa.pub 192.168.1.10"
	ssh -oStrictHostKeyChecking=no $rn "ssh-copy-id -i $HOME/.ssh/id_rsa.pub -oStrictHostKeyChecking=no $USER@192.168.1.10"
done