start.sh

#!/bin/bash

# Making all required files if they are not existing. (This means
# you may add a Docker volume on /etc/ssh or /root to insert your
# own files.)
test -f /etc/ssh/ssh_host_ecdsa_key || /usr/bin/ssh-keygen -q -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -C '' -N ''
test -f /etc/ssh/ssh_host_rsa_key || /usr/bin/ssh-keygen -q -t rsa -f /etc/ssh/ssh_host_rsa_key -C '' -N ''
test -f /etc/ssh/ssh_host_ed25519_key || /usr/bin/ssh-keygen -q -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -C '' -N ''
test -f /root/.ssh/id_rsa || /usr/bin/ssh-keygen -t rsa -f /root/.ssh/id_rsa -N ''
test -f /root/.ssh/id_rsa.pub || ssh-keygen -y -t rsa -f ~/.ssh/id_rsa > ~/.ssh/id_rsa.pub
test -f /root/.ssh/authorized_keys || /usr/bin/cp /root/.ssh/id_rsa.pub /root/.ssh/authorized_keys

# Change the owner.
chown -R root:root /root/.ssh

# Show the private key.
/usr/bin/cat /root/.ssh/id_rsa
/usr/bin/echo ""
/usr/bin/echo "Please save the printed private RSA key and login using:"
/usr/bin/echo "\"ssh -i \${savedkey} root@\${ipaddress}\""

# Now start ssh.
/usr/sbin/sshd -D -e