The Linux Cluster

SSH Login without Password

September 8, 2018 12:11 am

The SSH daemon validates SSH client access by Linux system verification via /etc/passwd, or by public/private key cryptography approach.

By using the public/private cryptography approach, we can do a SSH without password.

In my write-up it is for root-to-root connection. You can use it for user connections.

Steps 1: At the Host Machine

Logon to the root home directory.
Make sure the hidden .ssh directory has the permission 700. If not execute the command
```
# chmod 700 .ssh
```
Change Directory to .ssh directory by executing the command
```
# cd .ssh
```
Generate the public-private keys using the ssh-keygen command.
```
# ssh-keygen -t rsa
```
The resulting file id_rsa and id_rsa.pub rsa type public key
```
# ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host
```
(ssh-copy-id appends the keys to the remote-host’s .ssh/authorized_key)

Step 2: At the Remote Machine,

References

Posted by kittycool only

Categories: SSH

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