Passwordless SSH on Ubuntu Linux

1. Install openssh server

   sudo apt-get install openssh-server

2. Remove previous .ssh directory (from home directory)

   rm -r .ssh/

3. Now Execute the below command. Leave all the field empty when asked.

   ssh-keygen -t rsa

4. Execute the following commands after that

   cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
   sudo chmod go-w ~/
   chmod 700 ~/.ssh
   chmod 600 ~/.ssh/authorized_keys
   exec ssh-agent bash
   ssh-add

That’s it.

You can test on your machine.

ssh-copy-id localhost
ssh localhost

When you ssh localhost, it will not ask you password again.