Bash script that allows easily add new users with SSH keys to the remote machine.
How to use:
$ scp remote_machine_setup.sh root@remote-machine
$ ssh root@remote-machine 'remote_machine_setup.sh new_user_name "new_user_ssh_public_key"'
Content of remote_machine_setup.sh:
#!/bin/bash
set -xe
# Params:
# 1 — New user name.
# 2 — Authorized SSH key.
NEW_USER="$1"
AUTHORIZED_SSH_KEY="$2"
if [ -z "$NEW_USER" ]; then
echo "Please specify new user name."
exit 1
fi
if [ -z "$AUTHORIZED_SSH_KEY" ]; then
echo "Please specify authorized ssh key."
exit 1
fi
# Create user.
useradd "$NEW_USER" --create-home
# Set bash as default shell for new user, so you could place env vars and other things into `~/.bashrc`.
chsh -s /bin/bash "$NEW_USER"
# Set user directory as "working dir".
pushd "/home/$NEW_USER"
# Setup ssh access.
mkdir -p .ssh
chmod u+rwx,go= .ssh
echo "$AUTHORIZED_SSH_KEY" > .ssh/authorized_keys
chmod u+rw,go= .ssh/authorized_keys
# Example of adding env variable to user's ~/.bashrc.
mv .bashrc .bashrc_original
echo -e "export SOME_ENV_VAR_YOU_NEED=value\n" > .bashrc
cat .bashrc_original >> .bashrc
rm .bashrc_original
# TODO (optional): install tools you need to perform remote commands, i.e. packages, SDKs, so on.
# Set correct ownership to all user's files.
chown -R "$NEW_USER":"$NEW_USER" "/home/$NEW_USER/"
echo "New user $NEW_USER was set up correctly."
popd