.ssh/config file
vim /home/$USER/.ssh/config
Host <name>
Hostname <ip>
User <user>
Port <PORT>
IdentityFile /home/<USER>/.ssh/id_ecdsa
ssh-keygen -t ecdsa -b 521
ssh-copy-id -i /home/$USER/.ssh/id_ecdsa $SSH_USER@$IP
vim /home/$USER/.ssh/config
Host <name>
Hostname <ip>
User <user>
Port <PORT>
IdentityFile /home/<USER>/.ssh/id_ecdsa
ssh-keygen -t ecdsa -b 521
ssh-copy-id -i /home/$USER/.ssh/id_ecdsa $SSH_USER@$IP