# at google cloud
ssh-keygen
###### 3 ENTER

ls ~/.ssh

vi  ~/.ssh/config
Host netcup nc
  HostName netcup.ifong.cc
  User xxxxxxxxxxxx
  Port 8080
  IdentityFile ~/.ssh/id_ed25519

cat ~/.ssh/id_ed25519.pub
#######copy for later

ssh nc

ssh-keygen
####3 ENTER

vi ~/.ssh/authorized_keys

exit

ssh netcup
OR
ssh -p 8080 your_acc@netcup.ifong.cc