Automate SSH Authorization
I usually work on Linux machines. every time its a time taking task to generate ssh key generation between servers and copy the authorization key.
i have a small script which will generate and copy the files to your desired destinations and makes your task easy
Login to server A
#ssh-keygen -t rsa -b 2048
follow the instructions and complete the key generation with empty passphrase.
#cd /tmp
#vi sshkeycopy.sh
#-------- end of the script -----------
#! /bin/bash
PATH="/bin:/usr/bin" if [ ! -e ~/.ssh/id_rsa.pub ]; then
echo "RSA public key file ~/.ssh/id_rsa.pub not found!"
exit 1
fi
for desthost in $@; do
ssh -q "${USER}@${desthost}" \
"if [ ! -d ~/.ssh ]; then mkdir -m 0700 ~/.ssh; fi; \
echo $(cat ~/.ssh/id_rsa.pub) >> ~/.ssh/authorized_keys; \
chmod 0600 ~/.ssh/authorized_keys" || echo "Unable to connect to $desthost"
done
#-------- start of the script -----------
Save the test using :wq and quit.
# chmod 700 sshkeycopy.sh
Now you are ready to copy the generated keys to the destination servers
# cd /tmp #./sshkeycopy.sh serverB.linuxgurus.com serverC.linuxgurus.com
For the first time, it will ask password for the destination servers to copy the authorized_keys.
Now you can scp or ssh into destination servers from the current server without any passwords.
- Shankar