Copy public key to remote server

// on local server with ssh enabled, and public key / private key generated

// If not generate pub-private key first

Linux and MacOS X

1. Open a terminal window. At the shell prompt, type the following command:

   ssh-keygen -t rsa
   

2. The ssh-keygen program will prompt you for the location of the key file. Press Return to accept the defaults. You can optionally specify a passphrase to protect your key material. Press Return to omit the passphrase. The output of the program will look similar to this:

   Enter file in which to save the key (/Users/tony/.ssh/id_rsa):
   Created directory '/Users/tony/.ssh'.
   Enter passphrase (empty for no passphrase):
   Enter same passphrase again:
   Your identification has been saved in /Users/tony/.ssh/id_rsa.
   Your public key has been saved in /Users/tony/.ssh/id_rsa.pub.

// Copy generated public key(/.ssh/id_rsa.pub.) to remote server

3 . ssh-copy-id user@remoteHost

OR

1) on local server, retrieve public key

cat ~/.ssh/id_rsa.pub

// public key will start with ssh-rsa 

2) manually go to remote server 

vim ~/.ssh/authorized_keys

 and paste this key from step 1

https://docs.rightscale.com/faq/How_Do_I_Generate_My_Own_SSH_Key_Pair.html

https://linuxhandbook.com/add-ssh-public-key-to-server/ 

https://askubuntu.com/questions/46424/how-do-i-add-ssh-keys-to-authorized-keys-file