SSH Password-free login

Configuring SSH password-free login takes 3 steps:

1. Generate public and private keys

2. Import the public key to the authentication file, change the permissions

3. Testing


1. Generate public and private keys
Shell Code
　　SSH-KEYGEN-T RSA

The default is to generate two files in the ~/.ssh directory:
Id_rsa: Private key
Id_rsa.pub: Public Key
2. Import the public key to the authentication file, change the permissions
2.1 Importing this machine
Shell Code
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys



2.2 Importing a server to password-free login

First copy the public key to the server

Shell Code
SCP ~/.ssh/id_rsa.pub [email protected]:/home/xxx/id_rsa.pub

The public key is then imported into the authentication file, and this step is performed on the server

Shell Code
cat ~/id_rsa.pub >> ~/.ssh/authorized_keys



2.3 Changing permissions on the server


Shell Code
chmod ~/.ssh
chmod ~/.ssh/authorized_keys


3. Testing

SSH host, the first login may require a Yes confirmation, and then you can log in directly.

4, you can execute the command directly
SSH 10.207.139.62 ' hostname '

SSH Password-free login