ssh key passwordless using bash

Question

I would like to use ssh key authentication. I have a file that contains:

ip location

ip location

etc

i have a bash script as follow :

Answer 1

If you want to open an ssh session using your keys without having to putt the password I think that this is what you are looking for: http://www.linuxproblem.org/art_9.html

Answer 2

If you don't want to use a password and security is not important, another solution is to use sshpass.

This is generally not a good idea, specially in secure environments, but in some situations it can help.

sshpass -p raspberry ssh pi@192.168.0.145

this can be combined with

ssh -q -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no pi@192.168.0.145

to avoid confirmation questions that prevent automated scripting from happening.

Again, only use this in development systems where different machines share an IP and security is not important.

https://ownyourbits.com/2017/02/22/easy-passwordless-ssh-with-sshh/

Answer 3

Execute the following command from your host machine as the usual user. This will generate a public-private key for this user on that host.

ssh-keygen

The keys will by default be created under ~/.ssh and usually named as id_rsa (private key) id_rsa.pub (public key) Now the public key can be copied to any number of remote computers and all further secure log-ins to those hosts will not prompt for the password.

ssh-copy-id user@machine