SSH to server without password

The requirement to ssh to server without password

To ssh without password, you must meet the condition:

• Private key in client ~/.ssh/
• Public key in server ~/.ssh/authorized_keys

Steps to setup

1. Create ssh key pairs by ssh-keygen

   # Generate key
   ssh-keygen
   
   # Check the generated key pair
   ls ~/.ssh
   -rw-------  1 sing  staff  1679 Jun  8  2018 id_rsa
   -rw-r--r--  1 sing  staff   404 Jun  8  2018 id_rsa.pub

2. Login to your server

3. Copy the content of the publicKey (id_rsa.pub) to server’s ~/.ssh/authorized_keys

   echo "${public key content}" >> ~/.ssh/authorized_keys

4. Make sure the sshd setting /etc/ssh/sshd_config allow publickey authentication,

   PubkeyAuthentication yes

   Restart by sudo systemctl restart ssh if you modify the sshd setting.

5. Verify ssh without password

   ssh username@serverip