4 dropbearkey
-t rsa
-s 1024 -f /tmp
/dropbear_rsa_failsafe_host_key
5 dropbearkey
-t ed25519
-f /tmp
/dropbear_ed25519_failsafe_host_key
6 dropbear
-r /tmp
/dropbear_rsa_failsafe_host_key
-r /tmp
/dropbear_ed25519_failsafe_host_key
<> /dev
/null
2>&1
9 boot_hook_add failsafe failsafe_dropbear