SSH server enable / disable password authentication

Enable
sed -i 's|[#]*PasswordAuthentication no|PasswordAuthentication yes|g' /etc/ssh/sshd_config
sed -i 's|UsePAM no|UsePAM yes|g' /etc/ssh/sshd_config
service ssh restart

Disable (don´t forget to install pre-shared-key first: http://www.panticz.de/ssh_pre-shared-key_authentication)
<?php
$URL="https://raw.githubusercontent.com/panticz/scripts/master/disable_ssh_password_authentication.sh";
echo "wget -q --no-check-certificate $URL -O - | bash -";
echo "

";
$c = curl_init();
curl_setopt($c, CURLOPT_URL, $URL);
curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
echo htmlspecialchars(curl_exec($c));
curl_close($c);
echo "

";
?>

# LXC
# disable login without password
lxc-attach -n ${CONTAINER} -- sed -i 's|[#]*PasswordAuthentication yes|PasswordAuthentication no|g' /etc/ssh/sshd_config
lxc-attach -n ${CONTAINER} -- sed -i 's|UsePAM yes|UsePAM no|g' /etc/ssh/sshd_config
lxc-attach -n ${CONTAINER} -- service ssh restart

# generate SSH key for root
lxc-attach -n ${CONTAINER} -- ssh-keygen -q -f /root/.ssh/id_rsa -N ''