Use ssh to move between linux/unix servers without entering password each time.
Perform dsa key exchange once and hop around in btween two unix/linux servers without entering passwd each time.
Actions to perform :
1: run the attached shell script in the local server
ex : user neeraj in server server1
2: Enter data as asked on the command line. Enter target server name and passwd when asked.
3: Message displayed : " echo dsa kay exchange successfully done"
4: Done, check the new setting by typing command from local server: ssh target_server_name.
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#!/bin/sh
# check if the key file exists in the home location in local server
file_count=`ls -l $HOME/.ssh/ | grep id | wc -l`
if [ $file_count -eq 0 ]
then
ssh-keygen -t dsa
fi
#secure the contents of the .ssh directory by by removing read write permission from group and others.
chmod go-x $HOME
chmod go-rwx $HOME/.ssh
chmod go-rwx $HOME/.ssh/*
#copy the file to remote server
echo enter target machine hostname
read target
current_user=`whoami`
echo enter password of $target server
scp $HOME/.ssh/id_dsa.pub $whoami@$target:/tmp
echo again enter the passwd for the server $target
#append the content of public key to authorized_keys2 file
ssh $current_user@$target 'cat /tmp/id_dsa.pub >> $HOME/.ssh/authorized_keys2 '
ssh $target chmod go-w $HOME
ssh $target chmod 700 $HOME/.ssh
ssh $target chmod go-rwx $HOME/.ssh/*
ssh $target rm /tmp/id_dsa.pub
echo dsa kay exchange successfully done.
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