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fosslinux
Asked: 2017-07-27 16:35:06 +0800 CST

How do I setup an ssh key system without interaction?

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I need to be able to setup a ssh key system without interaction. I don't care if packages need to be installed or passwords in clear text.

How can I make a system that sets up a ssh key system, allowing machine A to ssh into the machine B and vice versa using ssh keys, without interaction?

ssh

1 Answers

  1. Best Answer

    Here's the plain code (copying and pasting WILL NOT WORK!!! Change things like my-username and my-ip). Run on both hosts:

    #!/bin/bash
apt-get -y install sshpass
ssh-keygen -p -N "" -f ~/.ssh/id_rsa
sshpass -p 'my_password' ssh-copy-id my_username@my_host_2

    Replace my_host_2 with my_host_1 on machine 2.

    Explanation:

    The first line, #!/bin/bash is called a shebang. Look here for more information.

    The second line installs sshpass without interaction.

    The third line uses ssh-keygen to create a key. -q means quiet; it dosen't ask as much. -N "" means no password and -f means to save it in the default location.

    The last line copies the actual key using ssh-copy-id and sshpass. You cannot echo the password through stdin, so we use sshpass which is the closest equivalent. -p is the password to use. The argument to ssh-copy-id is the username and host to copy the key to.

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