if [ ! -e /data/ssh/host_rsa_key ]; then
  echo "Generating host keys"
  ssh-keygen -t rsa -f /data/ssh/host_rsa_key
  ssh-keygen -t dsa -f /data/ssh/host_dsa_key
  ssh-keygen -t ecdsa -f /data/ssh/host_ecdsa_key
  ssh-keygen -t ed25519 -f /data/ssh/host_ed25519_key
fi