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For each user, do the following:

First you create the user account using the adduser command. Note that this command will prompt you for some additional details.

sudo adduser <username> --disabled-password

You then want to set up the user’s SSH authorized keys file and add their SSH public key to it using an editor of your choice. Please note that key formatting is very important, several examples of acceptable key types and formats are provided below.

sudo mkdir /home/<username>/.ssh
sudo touch /home/<username>/.ssh/authorized_keys

sudo vim /home/<username>/.ssh/authorized_keys

sudo chown -R <username>:<username> /home/<fed-id>/.ssh
sudo chmod -R 0700 /home/<username>/.ssh

Your user should now be able to log in to your machine with their SSH public key using the following command.

ssh <username>@<ip address>

If you also want the newly added user to have sudo permissions then you need to edit the /etc/sudoers.d/cloud file using the following command.

sudo visudo /etc/sudoers.d/cloud

Adding the following line to the bottom. Note that because we do not set a password for the user, the NOPASSWD option is necessary.

<username> ALL=(ALL) NOPASSWD: ALL