To install the sync service
===========================

On a systemd system:
  1) Copy the systemd/keys-sync.service file to /etc/systemd/system/
  2) Modify ExecStart path and User as necessary. If SSH Key Authority is installed under /home, disable ProtectHome.
  3) Run: systemctl daemon-reload
  4) Run: systemctl enable keys-sync.service

On a sysvinit system:
  1) Copy the init.d/keys-sync file to /etc/init.d/
  2) Modify SCRIPT path and USER as necessary.
  3) Run: update-rc.d keys-sync defaults