CentOS 6.6 ssh key password-free Login

CentOS 6.6 ssh key password-free Login

Generate a public key and private key file --> import the content of the public key file to the local authentication file, and change the permission --> obtain the private key file for login Test

1. Generate public and private key files

[root@kvm~] #ssh-keygen-trsa

Press enter here, or enter a password (this password is used to calculate the ssh key, not the login password)

We can see that a. ssh directory is automatically created under the/root directory, and a pair of key files are generated under the/root/. ssh directory.

Id_rsa Private Key

Id_rsa.pub Public Key

2. Import the public key file to the local authentication file and change the permission.

[root@kvm. ssh ] # Cat/root/. ssh/id_rsa.pub>/root/. ssh/authorized_keys # Add the public key file content to the authentication file authorized_keys. [root@kvm. ssh ] # Chmod600/root/. ssh/authorized_keys # This step is very important to change the permission of the authentication file to 600. [root@kvm. ssh ] # Chmod700/root/. ssh/# change the permission of the/root/. ssh directory to 700

3. Copy the private key file to another machine for verification.

3.1 Use xshell for testing in Windows

3.2 use a Linux host for testing