Question

4

Ubuntu: setup user-data ssh

rated 0 times [ 4] [ 0] / answers: 1 / hits: 4763 / 1 Year ago, fri, december 30, 2022, 9:17:40

I want to install Ubuntu Server 20.04 on Rpi 4 without monitor, so I have to setup SSH in advance by editing user-data file in system-boot folder.

Is it possible to setup SSH for user: set public key and disable password by default before the first login to my Pi?

I found one manual here but there is no info how to setup SSH properly in uaer-data file:

chpasswd:

  expire: true

  list:

  - ubuntu:ubuntu

I need help as I can't find any comprehensive example for such purpose, unfortunately. But there are some cloud config examples for virtual box (1, 2), so I don't know if it is valid for my case.

users:

  - default

  - name: ubuntu

    ssh-authorized-keys:

      - <your user public key here>

    sudo: ALL=(ALL) NOPASSWD:ALL

    groups: sudo

    shell: /bin/bash

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answered 1 Year ago lowovey · Accepted Answer

Folks, after several attempts installing Ubuntu w/o monitor (playing with blackbox) the required config was succeeded.

My user-data file:

users:

  - default

  - name: ubuntu

    sudo: ALL=(ALL) NOPASSWD:ALL

    groups: sudo, users, admin

    lock_passwd: true

    ssh_pwauth: True

    ssh_import_id: None

    ssh_authorized_keys:

      - <your user public key here>



#chpasswd:

#  expire: true

#  list:

#  - ubuntu:ubuntu



#ssh_pwauth: true

Note that default chpasswd and ssh_pwauth are commented out and ssh_authorized_keys written with underscores unlike many examples.

So, you have to generate SSH key on your machine and add it to ssh_authorized_keys list, that's all. No twitching after first connection is required.