ssh_copy_pubkey.md

Passwordless ssh or copy public key

Key based authentication in SSH is called public key authentication. The purpose of ssh-copy-id is to make setting up public key authentication easier.

Assuming:

• OpenSSH in both client and server is installed accordingly.
• Both computer/host using popular GNU/linux distribution which OpenSSH enabled by default.
• C is known as Client or user's computer/host.
• R is known as Remote or remote server/computer/host.

Open the terminal and follow this process:

1. C: Generate public key:

   ssh-keygen -t rsa

2. R: If not exist, make a .ssh folder on host's home folder:

   mkdir -p .ssh

3. C: Use either one of this:

   cat .ssh/id_rsa.pub  |ssh [email protected] 'cat>> .ssh/authorized_keys'

   or (recommended)

   ssh-copy-id [email protected]

4. C: Now, login to remote computer, it should be not asking password now:

   ssh [email protected]