Reference from URL below.
Source URL: http://www.thegeekstuff.com/2008/06/perform-ssh-and-scp-without-entering-password-on-openssh/
Perform SSH and SCP Without Entering Password on openSSH
Check if rsa keys(private & public) been created:
- private key = id_rsa
- public key = id_rsa.pub
ls -lrth /root/.ssh/
If not created then create rsa key, if created ( id_rsa & id_rsa.pub ) then skip to prevent existing authentication to be overwrite.
by default, is using rsa
ssh-keygen
or
ssh-keygen -t rsa
Copy public key to target remote server.
ssh-copy-id ~/.ssh/id_rsa.pub <user_id>@<ip_or_domain>
or
cat id_rsa.pub | ssh <user_id>@<ip_or_domain> 'cat >> .ssh/authorized_keys && echo "Key copied"'
<user_id>@<ip_or_domain>'s password:
Key copied
After copy by keyin target remote server password, by right should be able to ssh without password for sub sequence access.
ssh <user_id>@<ip_or_domain>
If happen to hit this Error:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: UNPROTECTED PRIVATE KEY FILE! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ Permissions 0744 for '/home/geek/.ssh/id_rsa' are too open. It is recommended that your private key files are NOT accessible by others. This private key will be ignored. bad permissions: ignore key: /home/geek/.ssh/id_rsa
Then could solve by using script below:
sudo chmod 600 ~/.ssh/id_rsa*
Source URL: http://www.howtogeek.com/168119/fixing-warning-unprotected-private-key-file-on-linux/
